VW Touran manuals

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).
   
Checking with Expansion Valve and Receiver/Dryer, with Internally Regulated A/C Compressor
  Note Connecting service station. Refer to → Chapter "Connecting Service Station". Observe test requirements. Re ...

Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve -N280-, Externally Regulated A/C Compressor
  Note Connecting service station. Refer to → Chapter "Connecting Service Station". Observe test requirements. Re ...

Other materials:

Volkswagen Touran Owners Manual. Information on fuel consumption
First read and observe the introductory information and safety warnings The figures quoted for fuel consumption and emissions do not refer to an individual vehicle. Their purpose is to enable comparisons to be made between various vehicle types. Fuel consumption and CO2 emissions not only ...

Volkswagen Touran Service Manual. Severely Discharged Batteries
  WARNING Risk of injury. Follow all Warnings and Safety Precautions. Refer to → Chapter "Warnings and Safety Precautions". For a battery to be indicated as "sever ...

© 2016-2023 Copyright www.vwtouran.net | 0.0466