Thread: D4 Intermittent Air Con

Kev,

I had the same issue on my previous car, a VW Multivan. It only occured after they repaired the A/C under warranty when the compressor flexible drive broke and it would consistently take several minutes to start cooling. Annoying and the dealer told me there was nothing wrong! I gave up trying to get it fixed and it was still the same when I sold the car.

Interestingly, the VW had the same system with constantly on compressor and varying gas flow to suit the cooling required. Sounds to me like the variable flow valve (probably not the correct wording but you know what I mean) is sticking in both cases. Since yours is also too cold sometimes, that confirms even more that the valve is probably misbehaving.

Bob

D4 3.0 compressors have an electro-magnetic clutch to engage/disengage the drive, unlike the D3 & D4 2.7 compressor.

Originally Posted by Graeme

D4 3.0 compressors have an electro-magnetic clutch to engage/disengage the drive, unlike the D3 & D4 2.7 compressor.

Thanks Graeme,

So I'm assuming if it's hot inside the car, a sensor 'tells' the system to enable the a/c system and the clutch is engaged? And then temperature control is achieved by a sensor 'telling' a valve to regulate the air coming into the car .... or does the clutch just keep engaging and disengaging as required to regulate the temp?

Either way then, I guess it's either a clutch or sensor(s) problem?

Shame it's intermittent ....

Cheers,

Kev.