Volkswagen Golf Service & Repair Manual: Possible complaints about refrigerant circuit
 Note
| The air conditioning system is operating correctly if the
air emerging from the vent on the dashboard is at a temperature
of 7oC or less. |
| Set the Climatronic to: “LO”. |
| Set the air conditioning system: “AC” on; “max”; “cold”. |
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| Self-diagnosis of the air conditioning system with the
Vehicle diagnosis, testing and information system -VAS 5051A-
using “Guided Fault Finding” cannot detect any faults; no
switch-off conditions for the air conditioner compressor are set
in the measured value block (only when the vehicle “air
conditioning system” is fitted with self-diagnosis). |
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Note
| For all complaints marked with a *
→ Chapter. |
| The cooling has failed completely. * |
| Insufficient cooling at all vehicle speeds and engine
speeds.* |
| No cooling or insufficient cooling after a distance of
several kilometres has been driven. * |
| The air conditioner compressor, the air conditioning system
magnetic clutch -N25- or the air conditioner compressor
regulating valve -N280- have been switched off by low-pressure
switch for magnetic clutch -F73-, high-pressure switch for
magnetic clutch -F118-, air conditioning system pressure switch
-F129- or by operating and display unit for Climatronic air
conditioning system -E87- or Climatronic control unit -J255-
because pressure was too high or too low.* * |
| No fresh air flow, or very much reduced fresh air flow after
driving some distance (evaporator iced up). * |
| In addition the following complaints may also arise: |
| The air conditioner compressor is noisy |
| – |
Tighten the securing screws for the air conditioner
compressor and the air conditioner compressor bracket using a
torque wrench. |
| – |
Check routing of refrigerant pipes; they must not touch
other components and must be installed without tension (adjust
if necessary). |
| Noises (refrigerant hammering) occur immediately after the
air conditioning is switched on and/or in a curve or when the
brakes are applied: |
| – |
Discharge refrigerant circuit, evacuate and charge again
(too much refrigerant in circuit). |
Note
| Excess refrigerant oil in the circuit may also cause this
problem (e.g. if the refrigerant oil level was not checked after
the air conditioner compressor was renewed). In case of this
complaint, the refrigerant circuit must be purged with R134a
refrigerant
→ Chapter. |
| The refrigerant must be drained from the air conditioning
compressor. To facilitate this process, turn the air conditioner
compressor over by hand at the poly V-belt pulley or coupling
disc of the magnetic coupling. Then fill refrigerant circuit
with total amount of refrigerant oil (50 g direct into air
conditioner compressor) according to
→ vehicle-specific workshop manual. |
| Water sprays out of the air vents (dash panel or footwell)
although the air conditioning system otherwise works properly: |
| – |
Check that the condensation water drain is properly routed;
it must not be pinched or kinked. |
| – |
The condensed water drain valve must not be hindered in its
operation by wax or underbody sealant and must open and close
properly. |
| – |
Check the plenum chamber cover; it must be undamaged and be
installed correctly (no water must flow into the evaporator). |
| – |
Check water drains in plenum chamber; they must not be
blocked (e.g. by leaves). |
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Complaints