Volkswagen Touran Service Manual: Flushing Circuit Block Diagrams
Note
The arrows in the following illustrations show the direction
of refrigerant flow while flushing. During flushing, refrigerant
flows in the opposite direction than during A/C system
operation, therefore the high pressure side of A/C service
station is connected to A/C compressor at low pressure side of
refrigerant circuit. |
These block diagrams indicate a refrigerant circuit with
restrictor and reservoir and a refrigerant circuit with
expansion valve, receiver/dryer and a second evaporator
(optional equipment on certain vehicles) |
Depending on the design of the A/C service station, check
valves can be installed between the refrigerant circuit and the
A/C service station. They guarantee the correct direction of
refrigerant flow during flushing. |
Refrigerant Circuit with Restrictor and Reservoir |
Note
On vehicles with restrictor and reservoir, the restrictor
and reservoir are removed. Restrictor refrigerant pipes are
reassembled. The refrigerant pipe to the removed reservoir are
connected with each other via two adapters and the Refrigerant
Circuits Adapter Set 2 - Adapter 31 -VAS6338/31- (from the
Refrigerant Circuits Adapter Set 1 -VAS6338/1-). |
|
|
|
With electronics and a flushing program, for example A/C Service
Station with Flushing Device -VAS6380- or Air Conditioning Flush Tool
-VAS6337-. |
If an A/C service station without a flushing program is used, the
procedure must be performed manually (evacuate, flush 3 times with at
least 4 kg refrigerant each and extract refrigerant again, evacuate). |
2 - |
A/C service station refrigerant hose |
From high pressure side of A/C service station (mostly colored red)
to low pressure side connection of A/C compressor on refrigerant circuit
(larger diameter). |
3 - |
Adapter for connecting low pressure side to refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
4 - |
Low pressure side connection on refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
On refrigerant line from A/C compressor to reservoir. |
5 - |
Connection to reservoir |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
On refrigerant line from A/C compressor to reservoir. |
6 - |
Adapter for bridging the removed reservoir |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
7 - |
Refrigerant charge hose. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
For example Refrigerant Circuits Adapter Set 1 - Adapter 31
-VAS6338/31- (from the Refrigerant Circuits Adapter Set 1 -VAS6338/1-) |
8 - |
Adapter for bridging the removed reservoir |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
9 - |
Connection to reservoir |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
11 - |
Component location of restrictor |
Remove restrictor. Refer to Heating, Ventilation & Air Conditioning. |
12 - |
Bolts in refrigerant line |
Bolt together again after removing restrictor. Refer to Heating,
Ventilation & Air Conditioning. |
14 - |
High pressure side connection on refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
15 - |
Adapter to connection for high pressure side on refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
16 - |
Charge hose for refrigerant circuit flushing device |
From connection to the high pressure side of the A/C compressor on
the refrigerant circuit (smaller diameter) to input of Refrigerant
Circuit Flushing Device -VAS6336/1- or Air Conditioning Flush Tool
-VAS6337/1A-. |
17 - |
Flushing equipment for refrigerant circuits |
Different versions and different construction, for example
Refrigerant Circuit Flushing Device -VAS6336/1- or Air Conditioning
Flush Tool -VAS6337/1-. |
With filter, viewing glass, security valve, heater, refrigerant
container, etc. (depending on version). |
Depending on the construction of the A/C service station and of
refrigerant circuit flushing device, a check-valve may be installed at
output of refrigerant circuit flushing device (to guarantee correct
direction of refrigerant flow during flushing). |
18 - |
A/C service station refrigerant hose |
From the low pressure side of the service station (mostly blue) to
the output of the flushing device for refrigerant circuits. |
Refrigerant circuit with expansion valve, receiver/dryer and
second evaporator |
Note
This block diagram shows a refrigerant circuit with
expansion valve, receiver/dryer and second evaporator (optional
equipment on certain vehicles). |
On vehicles with an expansion valve and receiver/dryer, the
expansion valve is removed and replaced by an adapter. Depending
on vehicle, receiver/dryer is flushed or dryer cartridge is
removed. Depending on receiver/dryer version, it is to be
removed and line connections to receiver/dryer are to be
connected to each other with two adapters and a charging hose. |
On a vehicle with only one evaporator, the components as of
position "16" are not installed or are not required. |
|
|
|
With electronics and a flushing program, for example A/C Service
Station with Flushing Device -VAS6380- or Air Conditioning Flush Tool
-VAS6337-. |
If an A/C service station without program is used for flushing, the
procedure should be performed manually. |
|
Extract the refrigerant, if necessary. |
|
Set up the Refrigerant Circuit Flushing Device -VAS6336/1- or Air
Conditioning Flush Tool -VAS6337/1A- between the A/C service station and
refrigerant circuit return line. |
|
Evacuate refrigerant circuit for 20 minutes and then charge with 4
kg refrigerant R134a. Then extract again and repeat the procedure 2 more
times. If the refrigerant in the viewing glass(es) is not clear after
the third attempt, an additional attempt is necessary. |
2 - |
A/C service station refrigerant hose |
From high pressure side of A/C service station (mostly colored red)
to low pressure side connection of A/C compressor on refrigerant circuit
(larger diameter). |
3 - |
Adapter for connecting low pressure side to refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
4 - |
Low pressure side connection on refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
5 - |
Adapter for the removed expansion valve |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
7 - |
Connection to receiver/dryer |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
Not present on vehicles with a dryer cartridge in receiver/dryer on
condenser or a receiver/dryer installed in the condenser. Refer to
Heating, Ventilation & Air Conditioning. |
8 - |
Adapter for bridging the removed receiver/dryer |
Not required for all vehicles. |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
9 - |
Refrigerant charge hose. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
For example Refrigerant Circuits Adapter Set 1 - Adapter 31
-VAS6338/31- (from the Refrigerant Circuits Adapter Set 1 -VAS6338/1-) |
If a receiver/dryer with dryer cartridge is installed on the
condenser, dryer cartridge must be removed (seal again the
receiver/dryer on or in the condenser after removing). Refer to Heating,
Ventilation & Air Conditioning. |
If receiver/dryer is built directly on the condenser, receiver/dryer
is to be removed and replaced only after flushing. Refer to Heating,
Ventilation & Air Conditioning. |
11 - |
High pressure side connection on refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
12 - |
Adapter to connection for high pressure side on refrigerant circuit |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
From the Refrigerant Circuits Adapter Set 1 -VAS6338/1- |
13 - |
Charge hose for refrigerant circuit flushing device |
From connection to the high pressure side of the A/C compressor on
the refrigerant circuit (smaller diameter) to input of refrigerant
circuit flushing device. |
14 - |
Flushing equipment for refrigerant circuits |
Different versions and different construction, for example
Refrigerant Circuit Flushing Device -VAS6336/1- or Air Conditioning
Flush Tool -VAS6337/1-. |
With filter, viewing glass, security valve, heater, refrigerant
container, etc. (depending on version). |
Depending on the construction of the A/C service station and of
refrigerant circuit flushing device, a check-valve may be installed at
output of refrigerant circuit flushing device (to guarantee correct
direction of refrigerant flow during flushing). |
15 - |
A/C service station refrigerant hose |
From the low pressure side of the service station (mostly blue) to
the output of the flushing device for refrigerant circuits. |
16 - |
Adapter to seal output to second evaporator |
Only required for certain vehicles with optional equipment "second
evaporator". |
From the Refrigerant Circuits Adapter Set 2 -VAS6338/50-. |
17 - |
Adapter to seal output to second evaporator |
Only required for certain vehicles with optional equipment "second
evaporator". |
From the Refrigerant Circuits Adapter Set 2 -VAS6338/50-. |
18 - |
Low pressure side connection on refrigerant circuit to second
evaporator |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
Only present on certain vehicles with optional equipment "second
evaporator". |
19 - |
Connection of high pressure side on refrigerant circuit to second
evaporator |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
Only present on certain vehicles with optional equipment "second
evaporator". |
20 - |
Adapter for the removed expansion valve on second evaporator |
Different versions depending on vehicle. Refer to
→ Chapter "Adapter for Assembling Flushing Circuit". |
Only required for certain vehicles with optional equipment "second
evaporator". |
From the Refrigerant Circuits Adapter Set 2 -VAS6338/50-. |
Only present on certain vehicles with optional equipment "second
evaporator". |
Vehicles with a high voltage system (hybrid vehicles)
Observe all of the additional warnings for all work
performed on vehicles with the high voltage ...
Vehicles with a high voltage system
Observe all of the additional warnings for all work
performed on vehicles with the high voltage system. Refer to
...
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