tdi 110bhp, common VW engine etc
A/C has never worked despite regassing. Suspect compressor is not coming on as no change in revs when A/C engaged. How best to check operation of the compressor?
It always seems to have approx 5v going to it, even when A/C not selected. I tried taking power direct to it from battery (with engine OFF) but couldn't detect any noise of internal clutch engaging. Or would this ONLY occur when engine running?
ta
Kester
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Does this model actually have a clutch?, or is it a variable diaplacement compressor which is always running?
The best way to see what's going on is via measuring the system pressures during various AC running conditions.
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thanks for your reply. I dont think I have a way to test pressure. There is an electrical connector - if it were variable displacement what would this do? it certainly looks the same as the following:
www.airconditioningforcars.co.uk/ACpage03.htm
If it is variable displacemnt and is faulty, is there likely to be any remedy other than renewing it? I've just had a pay cut and am on a tight budget and the car is on 183K miles so dont wanna spend too much.
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If the pump is the same as in the picture,then this will be a standard magnetic clutch variable displacement type.You should be able to energise the clutch and hear a slight click if battery power is applied to the green(usually) wire ot the 2-pin connector.However it is fairly common on this model for the hub nut to come undone and the clutch plate to fall off and consequently the compressor will not engage and there will be no" click."hth
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many thanks for your spedy reply! When you say the clutch plate falls off, is this internal or visible? What is the remedy, a new compressor or just screw it back on? Do I have to remove from vehicle and take it apart?
I did try connecting power and head no click of engagement, but will try to confirm again
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