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. |
|
|
|
Checking
| |
Connect pressure gauge battery (A/C service station). |
| |
Take pressure gauge readings. There are two possible results
A and B. |
|
|
|
| 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. |
| |
Set A/C system to maximum cooling output. |
| |
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: |
| |
Bring engine speed up to 2000 RPM. |
| |
Observe manometer battery: |
|
|
|
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). |
|
|
|
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 ...
Other materials:
Volkswagen Touran Owners Manual. Brake fluid
Fig. 138 In the engine compartment: cap
of the brake fluid container (variant 1)
Fig. 139 In the engine compartment: cap
of the brake fluid container (variant 2)
First read and observe the introductory information
and safety warnings Brake fluid will gradually absorb water from the surro ...
Volkswagen Touran Owners Manual. Parking
Fig. 151 On the screen: static orientation
lines for the parking space behind the vehicle
First read and observe the introductory information
and safety warnings Overview of the orientation aid
Colour
Meaning of the orientation lines on the screen
a) â ...
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Checking with Expansion Valve and Receiver/Dryer, with Internally Regulated
A/C Compressor
Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve
-N280-, Externally Regulated A/C Compressor