Hi

My air con isn't getting cold, when I press the air con button the fresh air coming out the vents doesn't change. I've had the system re-gassed and they said there are no leaks. I've checked all the flap motors that I can see (4 of them, 3 on the left hand side and 1 on the right), all seem to be working.

I've been looking at the workshop manual and the owners manual to try to find any fuse or relay that might control or power the compressor. Apart from fuse 7 behind the glove box, I can't see anything else, is there a relay? Does the compressor on this model have a clutch that should kick in? I read that some vehicles have some kind of variable compressor, so you don't get the click when you switch on the air con. Can I use vcds to check the air con pressure when it's off and when the engine is running. I'd appreciate some guidance on that as I'm new to vcds.

Many thanks in advance for any help.

The A/c compressor on your vehicle does not have an electric clutch, but is permanently driven by the aux. belt.

There is a mechanical shear-plate connecting the compressor shaft to the pulley, check that it is still connected to the compressor.

Yes, VCDS should give you data on the A/C.

Edited Wednesday at 10:015 days by Warrior193
added information

Thanks I'll have a look over weekend.

Hi, I managed to find the relevant part of VCDS.

These where the reading I got:

IDE 00021 engine speed 1100/min

IDE 00198 Refrigerant pressure 0.8 bar (11.6psi)

IDE 00968 Compressor speed 1300/min

This bar reading is the same static and running, air con on and off.

I don't know if I've done this right but I checked the sensor with a multimeter and the reading seems to be 10k ohms, air con switched on or off.

Not sure where to go from here.

By the way the condenser rad at the front is not leaking but it's an awful mess, with fins missing and looking pretty blocked for air flow.

Edited Friday at 10:093 days by normanb

I'd say from that pressure of 0.8bar, that the system has lost all its refrigerant.

According to a search, typical pressures for 134A A/C systems are -

• Static (A/C off) 4 to 6bar.

• Suction side (running @20deg.C) 1.7 to 3.1bar.

• Discharge side - 10 to 17bar.

Edited Friday at 11:253 days by Warrior193
clarification

Thanks I'll get back to the garage that did the re-gassing a few weeks ago. 5th of May to be precise charged me £96 for the privilege.

Edited Friday at 11:363 days by normanb

Looks like they vacuumed out the R134a and forgot to replace it.....

Going back to them, have to wait to near the end of August unfortunately.