Volkswagen Touran Service Manual: Checking with Expansion Valve and Receiver/Dryer, without Regulated A/C
Compressor
Test Requirements
Radiator and condenser are clean (clean if necessary). |
The ribbed belt for the A/C compressor and alternator
tensioned correctly. |
All air ducts, covers and seals are OK and installed
correctly. |
The doors reach their end position. |
Evaporator and heater not drawing in secondary air (at
maximum fresh-air blower speed). |
With engine running and A/C system set to maximum cooling
output, pay attention to the following points: |
The fresh air blower is running. |
The coolant fan must be running or it must be switched on. |
The recirculation/fresh air door must be in the
"recirculation" position. |
Ambient temperature is greater than 15
0C. |
The A/C Evaporator Temperature Switch -E33- is installed
correctly and its switch temperatures are correct. |
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Checking
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Connect pressure gauge battery (A/C service station). |
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Take pressure gauge readings. There are two possible results
A and B. |
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Ambient
Temperature in C (F) |
Pressure in
Refrigerant Circuit in Bar (psi) Positive Pressure |
15 (60) |
3.9 (57) |
20 (68) |
4.7 (68) |
30 (86) |
6.7 (97) |
40 (104) |
9.1 (132) |
A- The pressure in the refrigerant circuit is lower than the
pressure specified in the table. There is not enough refrigerant
in the circuit. |
- Search for leak with leak detection device. |
- The pressure release valve is open, check coolant fan
activation according to the wiring diagram. |
Check refrigerant pipes and hoses to see if they are bent
too sharply (cross-section constrictions) or have external
damage. If no malfunction is found, flush refrigerant circuit. |
B - The pressure in the refrigerant circuit matches the
table or is higher. |
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Set A/C system to maximum cooling output. |
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Open vents in instrument panel. |
The A/C compressor is driven by the engine via the magnetic
clutch using the ribbed belt. |
 Note
If the A/C compressor is not driven, check A/C Clutch -N25-
voltage supply. |
If the voltage supply is OK, repair the magnetic clutch. |
If the A/C compressor is driven, check refrigerant circuit: |
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Bring engine speed up to 2000 RPM. |
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Observe manometer battery: |
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Specified Values
Increasing from pressure with engine not running to a
maximum of 20 bar (290 psi). |
Decreasing from pressure with engine not running down to 1.3
bar (18.9 psi). |
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Note
Connecting service station. Refer to
→ Chapter "Connecting Service Station".
Observe test requirements. Re ...
Note
Connecting service station. Refer to
→ Chapter "Connecting Service Station".
Observe test requirements. Re ...
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