Volkswagen Touran Service Manual: Checking with Expansion Valve and Receiver/Dryer, without Regulated A/C Compressor

Volkswagen Touran Service Manual / Heating, Ventilation and Air Conditioning / Pressures, Checking / 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.

The engine is warm.

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

Turn off the ignition.

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.

Start the engine.

Set A/C system to maximum cooling output.

Open doors.

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

High-pressure side:

Increasing from pressure with engine not running to a maximum of 20 bar (290 psi).

Low-pressure side:

Decreasing from pressure with engine not running down to 1.3 bar (18.9 psi).

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