Audi Q7: Refrigerant Circuit, Cleaning (Flushing), with Refrigerant R134a
General Information
Vehicles with a High Voltage System (Hybrid Vehicles)
Extremely Dangerous Due to High-Voltage
The high-voltage system is under high-voltage. Death or serious
bodily injury by electric shock.
- Individuals with electronic/medical life- and health sustaining
machines in or on their person cannot perform any work on high-voltage
systems. Life- and health sustaining machines are for example pain
killer pumps, implanted defibrillators, pacemakers, insulin pumps, and
hearing aids.
- Have the high-voltage system de-energized by a qualified person.
There is a Risk Of Injury from the Engine Starting Unexpectedly
On electric - hybrid vehicles an active ready mode is difficult to
identify. Parts of the body can be clamped or pulled.
- Turn off the ignition.
- Place the ignition key outside of the vehicle interior.
Risk of Damaging the High-Voltage Cables
Misuse can damage the insulation of high-voltage cables or
high-voltage connectors.
- Never support objects on the high-voltage cables and the
high-voltage connectors.
- Never support tools on the high-voltage cables and the high-voltage
connectors.
- Never sharply bend or kink the high-voltage cables.
- When connecting pay attention to the coding of the high-voltage
connectors.
- For all procedures on vehicles with high-voltage system pay
attention to the additional warning message for these vehicles.
Refer to
→ Chapter "Warnings when Working on Vehicles with High Voltage
System".
- If procedures are necessary near components of the
high-voltage system "perform a visual inspection of the damage
of the high-voltage components and lines". Refer to
→ Chapter "Performing a Visual Inspection of Damage to High
Voltage Components and Cables".
- If work on the components of the high-voltage system is
necessity, de-energize the high-voltage system. Refer to
→ Rep. Gr.93; High-Voltage System, De-Energizing or
→ Electrical Equipment; Rep. Gr.93; High-Voltage System,
De-Energizing.
- Charge the vehicle battery, for example, using the Battery
Charger -VAS5904- in the battery support mode to minimize the
number of automatic starts during the test- and measuring
procedures while the ready mode is active. Refer to
→ Electrical Equipment General Information; Rep. Gr.27; Battery;
Charging the Battery and
→ Electrical Equipment; Rep. Gr.93; General Notes for Working on
the High Voltage System.
- Move the selector level into position "P", activate the
parking brake and arrange the necessary tools for testing and
measuring procedures that require the ready mode to be active or
that require the ignition to be on, so that they cannot come
into contact with the turning components in the engine and so
that they are not in the vicinity of the turning components of a
running engine.
Note
- Also move the selector lever into position "P" and activate
the parking brake for testing and measuring procedures which
require the ignition to be on, but do not require the ready mode
to be active.
- The ready mode is displayed in the Instrument Cluster
Control Module -J285- above the "powermeter". Refer to Owner's
Manual.
- Activate and deactivate the ready mode. Refer to Owner's
Manual (consult the display in the Instrument Cluster Control
Module -J285-).
All Vehicles
Caution
- If it is suspected that chemicals were added to the
refrigerant circuit to seal leaks, chemical substances
to seal leaks in the refrigerant circuit (leak stop
additive), do not connect the A/C service station, do
not extract the refrigerant and do not clean (flush).
- Chemicals that seal leaks in the coolant circuit
form deposits that affect the function of the A/C system
and lead to failure of the A/C system and the A/C
service station.
- Inform that customer that there are substances in
the A/C system that are no approved by Volkswagen and
for this reason the climate control system cannot be
cleaned (flushed) or serviced.
Note
- Audi does not approve the use of chemicals to seal leaks in
the refrigerant circuit (leak stop additives).
- Chemical materials (leak stop additives) to seal leaks in
the refrigerant circuit react with air or the moisture in the
air and form deposits in the refrigerant circuit (and in the A/C
service station) that lead to malfunctions in the valves and
other components that come into contact with such chemicals.
These deposits cannot be removed completely from the components,
even by cleaning/flushing. It is only possible to service the
refrigerant circuit by replacing all the components which come
in contact with this material.
- It is not possible to recognize chemical substances to seal
leaks in the refrigerant circuit (leak stop additive) and the
label that is supposed to come with them is usually not there.
Therefore be careful when working with if you do not know its
service history.
- Refrigerant circuit must be cleaned (flushed) with
refrigerant R134a in order to force out moisture and other
contaminants as well as old refrigerant oil as efficiently as
possible, without wasting refrigerant, without the need for
extensive assembly work and without endangering the environment.
Flush the refrigerant circuit:
- In the event of dirt or other contamination in the circuit.
- If vacuum reading is not maintained on evacuating a
leak-free refrigerant circuit (pressure build-up due to moisture
in refrigerant circuit).
- The refrigerant circuit has been left open for longer than
normal (for example, following an accident).
- Pressure and temperature measurements in the refrigerant
circuit indicate the likelihood of moisture.
- In the event of doubt about the amount of refrigerant oil in
the circuit.
- The A/C compressor had to be replaced on account of internal
damage (for example, noise or no output).
Note
- Pay attentions when replacing the Electrical A/C Compressor
-V470- on vehicles with electrically driven A/C compressor (if
the electronic on the A/C compressor is damaged the refrigerant
circuit must not always be cleaned. Refer to
→ Chapter "Compressor, Replacing without the Need for Flushing
Refrigerant Circuit".
- If a faulty A/C compressor is replaced with an A/C
compressor from another manufacturer check for the A/C
compressor to be installed has the same refrigerant oil approved
which is already in the refrigerant circuit (from the removed
A/C compressor). If a different refrigerant oil is approved for
the A/C compressor to be installed then the A/C compressor which
was removed, the refrigerant circuit must be flushed. Refer to
→ Chapter "Approved Refrigerant Oils".
- If it is stipulated by the vehicle-specific repair manual
following the replacement of certain components.
Tools required
- A/C Service Station with Flushing Device (on these A/C
service stations, the auxiliary function "flush refrigerant
circuit" and the refrigerant circuit flushing device required
for it are present on these A/C service stations). Refer to the
Parts Catalog (Tools; Special Tools and Equipment: A/C and
Heating).
- Refrigerant Circuits Adapter Set 1 -VAS6338/1-. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and the Parts Catalog (Tools; Special Tools and Equipment: A/C
and Heating).
Note
- If a A/C Service Station with Flushing Device is not
available, it is possible to flush the refrigerant circuit with
(with refrigerant R134a) the flushing device available using
Refrigerant Circuit Flushing Device, however the procedure must
be done manually. Refer to the Parts Catalog and
→ Anchor.
- On vehicles with screw connections on the refrigerant
circuit, the A/C Adapter Set Adapter 7 -VAG1785/7- and A/C
Adapter Set Adapter 8 -VAG1785/8- from Refrigerant Circuits
Adapter Set 1 -VAS6338/1- can be used; on vehicles with screw
connections at the A/C compressor and reservoir, two A/C Adapter
Set - Adapter 8 -VAG1785/8- are required.
- In Refrigerant Circuits Adapter Set 1 -VAS6338/1-, there is
also a Refrigerant Circuits Adapter Set 1 - Adapter 31
-VAS6338/31- with connections 5/8 -18 UNF and large inner
diameter in short version (commercially available).
Preliminary Work
- Discharge refrigerant circuit. Refer to
→ Chapter "Refrigerant Circuit, Discharging with Service
Station".
- Remove the A/C compressor. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; A/C
Compressor (vehicle-specific repair manual).
On a vehicle with restrictor and reservoir
- Remove restrictor (vehicle-specific) and reconnect lines
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- Remove reservoir (vehicle-specific) and reconnect the lines
(use adapters and Refrigerant Circuits Adapter Set 1 - Adapter
31 -VAS6338/31- from the Refrigerant Circuits Adapter Set 1
-VAS6338/1-). Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
Note
- Depending on the version, the reservoir could be potentially
flushed but it will take too much refrigerant because of its
large internal volume; the reservoir would ice-up too much when
extracting the refrigerant, the refrigerant would evaporate too
slowly and the extraction process would take too long.
- Depending on the version, the receiver/dryer can be
potentially flushed (see vehicle-specific description) but it
will take too much refrigerant because of its large internal
volume; the receiver/dryer would ice-up too much when extracting
the refrigerant, the refrigerant would evaporate too slowly and
the extraction process would take too long.
On a vehicle with expansion valve and receiver/dryer
- Remove receiver/dryer (vehicle-specific, not necessity on
all vehicles) and reconnect the lines (use adapters and
Refrigerant Circuits Adapter Set 1 - Adapter 31 -VAS6338/31-
from the Refrigerant Circuits Adapter Set 1 -VAS6338/1-). Refer
to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
Note
- The receiver/dryer can be flushed depending on the version
(remove dryer cartridge if necessary). Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- The receiver/dryer connected to the condenser (for example
on model Audi A3 from model year 2004) remains installed during
flushing (it can be flushed due to its design and is only
replaced after flushing). Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then they cannot be replaced separately or are
not available as a single part, and the condenser must be
replaced. Replace the condenser with the receiver/dryer on these
vehicles. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit and Parts Catalog.
- Receivers/dryers where it is possible to replace the dryer
cartridge have an additional filter, which must also be replaced
with the dryer cartridge.
- Remove dryer cartridge from vehicles with dryer partridge in
receiver/dryer that is connected to the condenser
(vehicle-specific), and seal opening on receiver/dryer. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- Remove expansion valve (vehicle-specific) and install one
adapter from the Refrigerant Circuits Adapter Set 1 -VAS6338/1-.
Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- For vehicles with multiple shut-off valves and check valves,
remove the valve and install the corresponding adapter (or hand
shut-off valves) from the Refrigerant Circuits Adapter Set 1
-VAS6338/1-. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit; System Overview - Refrigerant
Circuit (vehicle-specific repair manual).
Note
If there is no adapter suitable
for the expansion valve in the Refrigerant Circuits Adapter Set
1 -VAS6338/1-, the removed expansion valve can also be drilled
open (the old expansion valve must also be replaced in most
cases and is therefore no longer required).
Caution
- Make sure the sealing surfaces on the expansion
valve are not damaged when drilling open.
- Refrigerant will otherwise escape if the sealing
surface is damaged.
Drill a hole for the expansion valve.
Note
- Before drilling open, remove the regulating element and
drill open the expansion valve using a suitable drill, for
example (drill bit diameter 6.0 mm, for example).
- Several components are to be removed from expansion valve
before drilling open.
- Expansion valves are available in various versions and with
different constructions. For version -A-,
for example. parts -B-,
-C- and -D-
must be removed. Separate part -E-
(regulating element) from component -D-.
Then drill open expansion valve in area
-F- using a suitable drill.
- For version -G- for example,
parts -H-,
-I- and -K- must be removed
and then drill the open area -L-
using a suitable drill.
- Clean the drilled open expansion valve of residue from the
work (shavings).
- Install the parts -B-,
-C- and -D-
for version -A-, or the part
-H- for version
-G-.
Note
On vehicles with two evaporators, disconnect second
evaporator circuit from first evaporator circuit and flush
separately. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
Flushing
- Check refrigerant quantity in the A/C service station, there
must be at least 6 kg of refrigerant R134a.
Note
If necessary, turn on the heating installed in the service
station for the refrigerant container before the first flushing
(to increase the pressure in the refrigerant container) and turn
it off before first extraction during flushing.
- Drain the old oil container of the A/C service station.
- Connect the supply hose (high pressure side) of A/C service
station to the low pressure line leading to the A/C compressor
(line with larger diameter) using an adapter. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit".
- Connect the return hose (low pressure- or intake side) of
the A/C service station to the output of the refrigerant circuit
flushing device.
- Connect the input on the refrigerant circuit flushing device
to the high pressure line leading to the A/C compressor (line
with smaller diameter) using an adapter. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit".
Note
- Components are always (with the exception of the electrical
A/C compressor) flushed in the opposite direction of refrigerant
flow when the A/C system is in operation. Refer to
→ Chapter "Flushing Circuit Block Diagrams".
- While flushing, contaminants from the refrigerant circuit
enter the refrigerant circuit flushing device and the A/C
service station and are absorbed by the filters and dryers
installed there. Depending on the contaminant, these components
are to be replaced in shorter intervals in line with operating
instructions for A/C service station or refrigerant circuit
flushing device.
- The filter in the refrigerant circuit flushing device
depends on the type and degree of contamination in the flushed
refrigerant circuit, it should be changed after five to ten
flushing cycles (flushed vehicles) at the latest. If a heavily
contaminated refrigerant circuit is flushed (the refrigerant oil
from the circuit is black and viscous or there are many shavings
in the refrigerant circuit), the filter should be replaced after
flushing. With a refrigerant circuit heavily contaminated in
this way, it is wise to flush the circuit again after changing
the filter.
- Depending on the type of contamination, dirt (old
refrigerant oil and abraded material from A/C compressor) is
deposited on the viewing glass. Clean the viewing glass after
flushing if necessary, and flush the refrigerant circuit once
more with one flushing procedure as a check (one cycle is
sufficient).
- Liquid refrigerant cannot be led through the expansion
valve, restrictor and dryer bag of certain receiver/dryers at an
appropriate speed, therefore these components must be removed
and replaced by adapters if necessary
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- For adapters for connecting the A/C service station and for
bridging certain components of refrigerant circuit. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit".
- Remove the flushing circuit depending on the refrigerant
circuit in the vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit".
Vehicles with two evaporators in the refrigerant circuit:
Note
- The refrigerant circuit is cleaned in two flushing cycles
(first the section with the evaporator in the front heater and
A/C unit and then the section with the evaporator in the rear
heater and A/C unit. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit".
- On vehicles with two evaporators, disconnect second
evaporator circuit from first evaporator circuit and flush
separately. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
Vehicles with high-voltage system (without additional
functions of the A/C system for example on the Audi A3 e-tron,
Q5 hybrid etc.):
Note
- The refrigerant circuit is cleaned in two flushing cycles
(first the section with the evaporator in the front heater and
A/C unit and then the section with the high-voltage battery heat
exchanger or the evaporator in the battery cooling module).
Refer to
→ Chapter "Adapter for Assembling Flushing Circuit".
- On vehicles with two evaporators or an evaporator with a
heat exchanger, disconnect second evaporator circuit from first
evaporator circuit or to the evaporator via a hand shut-off
valve and flush separately. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- A flushing circuit is comprised of three flushing procedures one after
the other (depending on the program in the respective A/C service station).
- If necessary close or open the installed hand shut-off
valves depending on which section of the refrigerant circuit
should be flushed in this flushing circuit.
- Close or open the equipped electrically powered valves using
the designated routine in the corresponding vehicle control
module depending on which section of the refrigerant circuit is
to be flushed in this flush cycle.
Vehicles with a high-voltage system (with additional
functions of the A/C system such as heat pump operation for
example on the Audi Q7 e-tron etc.):
Note
- The refrigerant circuit is cleaned in multiple flushing
cycles. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit"
and
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
- To flush the refrigerant circuit is divided into multiple
sections and then cleaned respectively in a flushing cycle. The
division takes place by activating the installed electrically
activated valves and via the installed manually activated hand
shut-off valves. Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
- A flushing circuit is comprised of three flushing procedures one after
the other (depending on the program in the respective A/C service station).
- The design of the different flushing circuits for these
vehicles is described in the respective vehicle-specific repair
manual. Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
- Closing or opening the installed hand shut-off valves
depends on which section of the refrigerant circuit should be
flushed in this flushing circuit. Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
- Close or open the equipped electrically powered valves using
the designated routine in the corresponding vehicle control
module depending on which section of the refrigerant circuit is
to be flushed in this flush cycle. Use the Vehicle Diagnostic
Tester in the "Guided Fault Finding" flushing and the
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
All Vehicles
- Turn on the A/C service station and flush the refrigerant
circuit (duration approximately one to one and a half hours for
one flushing cycle with three flushing operations).
Note
- Perform flushing procedure according to operating
instructions of the A/C service station. Refer to the operating
instructions for the A/C service station.
- Depending on version of A/C service station, old oil
container holds only approximately 125 cm 3 refrigerant oil, in the event a system with a larger
quantity of refrigerant oil must be flushed, it may be necessary
to drain the old oil container after the first flushing process
of one flushing cycle.
- Observe the refrigerant which flows back into the A/C
service station from the refrigerant circuit, only when the
refrigerant streams clear and completely colorless through the
viewing glass of refrigerant circuit flushing device into the
A/C service station is the refrigerant circuit cleaned.
- While flushing, all the refrigerant oil is washed out of the
refrigerant circuit (up to a very small amount, for example in
the evaporator, however this can be disregarded).
- If heavily contaminated, it may be necessary to perform the
flushing procedure twice (two flushing cycles with three
flushing operations each).
Sequence of flushing procedure
(sequence occurs automatically according to the A/C service
station program)
- After turning on, the flushing circuit (refrigerant circuit
with connecting hoses and flushing equipment for refrigerant
circuits) is evacuated first and the refrigerant circuit is
checked for leaks during this. Depending on the A/C service
station version, it is possible that manually switching to
advance the program is required. Refer to the operating
instructions for the A/C service station.
- A prescribed quantity of refrigerant (such as 5 kg) is
filled into the evacuated refrigerant circuit via the high
pressure side of the A/C service station (in opposite direction
of normal flow when A/C system is in operation and also on the
low pressure side of the vehicle refrigerant circuit), or, as
much refrigerant is filled until refrigerant circuit and viewing
glasses of refrigerant circuit flushing device are completely
filled with fluid refrigerant (depending on version of A/C
service station, recognized, for example, that refrigerant no
longer flows from behind over a certain time period).
- After the prescribed quantity of refrigerant has been
filled, for example, the heater for the refrigerant circuit
flushing device is turned on (only in the event the refrigerant
is extracted in gaseous form from the refrigerant circuit
flushing device), depending on version of A/C service station
and refrigerant circuit flushing device.
- After the refrigerant was extracted, the heating of the
flushing device for refrigerant circuits is switched off (if
present), it may occur that the refrigerant circuit is shortly
evacuated again, depending on its version. After evacuation, the
refrigerant extracted from the refrigerant circuit is deposited
by the service station.
- The sequence of filling refrigerant, extracting (and
evacuating) is repeated twice (performed a total of three
times). Refer to the operating instructions for the A/C service
station.
- After the third extraction, the flushing circuit is
evacuated depending on the version of the A/C service station.
- After the flushing procedure has ended, check the viewing
glass(es) of refrigerant circuit flushing device, if they are
soiled, clean them if necessary according to operating
instructions of the refrigerant circuit flushing device or of
the A/C service station and perform the flushing procedure once
more as a test (one cycle is sufficient, duration approximately
30 minutes). refer to the operating instructions for the A/C
service station.
- Check the pressure in the refrigerant circuit, there must be
no positive pressure in the refrigerant circuit (evacuate
briefly once more if necessary).
- Disconnect the connections to the A/C service station from
the vehicle refrigerant circuit (there must be no positive
pressure in the refrigerant circuit).
- Replace these components depending on equipment (restrictor
and reservoir, expansion valve and receiver/dryer or dryer
cartridge in the receiver/dryer). Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
- Replace the A/C compressor, depending on its condition.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; A/C
Compressor (vehicle-specific repair manual) and Parts
Catalog or drain the rest of the refrigerant oil still inside
the removed A/C compressor. Refer to
→ Chapter "Refrigerant Circuit Components, Replacing"
(replace the refrigerant circuit components) and will new
refrigerant. Refer to
→ Chapter "Approved Refrigerant Oils and Capacities"
(Approved Refrigerant Oils and Capacities).
Note
- There is a defined and prescribed amount of refrigerant oil
in the replacement compressor. If the vehicle has two
evaporators, then there refrigerant circuit requires a specific
quantity of refrigerant oil. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and
→ Chapter "Approved Refrigerant Oils and Capacities".
(Approved Refrigerant Oils and Capacities).
- If the A/C compressor is not be replaced, the quantity of
refrigerant oil in the A/C compressor must be topped off to the
prescribed capacity (tilt the refrigerant oil out and refill the
prescribed quantity into the A/C compressor or refrigerant
circuit). Refer to
→ Chapter "Refrigerant Circuit Components, Replacing"
(replacing refrigerant circuit components) and
→ Chapter "Approved Refrigerant Oils and Capacities".
Approved Refrigerant Oils and Capacities).
- Reassemble the refrigerant circuit completely. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- Evacuate and recharge the refrigerant circuit according to
specification. Refer to
→ Chapter "Refrigerant Circuit, Discharging with Service
Station" and
→ Chapter "Refrigerant Circuit, Charging with Service Station".
- Start up A/C system according to specification. Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit; A/C System, Starting Operation after
Filling Refrigerant Circuit (vehicle-specific repair
manual) and
→ Chapter "A/C System, Operating after Charging".
READ NEXT:
Note
The arrows in the following illustrations show the direction
of refrigerant flow during flushing (refrigerant flows in
opposite direction of flow when Air Conditioning (A/C) system is
Vehicles with a High Voltage System (Hybrid Vehicles)
Extremely Dangerous Due to High-Voltage
The high-voltage system is under high-voltage. Death or serious
bodily injury by electric shock.
- I
Various adapters which are required to connect the Air
Conditioning (A/C) service station to the refrigerant circuit
for flushing and to bridge the removed receiver/dryer or
reservoir and expansi
SEE MORE:
1 - Brake Shield
Refer to
→ Chapter "Brake Shield, Removing and Installing"
2 - Wheel Bearing Housing
3 - Bracket
For brake hose
4 - Bolt
20 Nm
5 - Bracket
For brake hose
6 - Rivet
7 - Bracket
For the brake
Fig. 167 Motor compartment: cap on brake fluid reservoir
Observe the safety precautions, General
information.
Checking the brake fluid level
The brake fluid reservoir is located under a cover
on the driver's side.
Park the vehicle on a level surface.
Lift the cover fig. 164 at both
openings an