Quick A/c Question

[wackojackouk]

Hi guys

 

Quick question for you knowledgable folk.

 

Had my Condenser replaced under warranty a few months back and the a/c guy couldn't get the a/c to work correctly once finished. He tripled checked everything and said that it appeared that the compressor had now failed - he knew it was working prior as he checked.

 

Anyway he said to keep car on ECON for the time being and sort it out later (winter was coming etc) and not to use the A/C in case the system kicked a load of crap through the new condenser.

 

Having some other issues with the car so was playing with VCDS Lite the other day and noticed an A/C error which I think is related to being under filled/overfilled. Where the condenser was knackered it was empty.

 

Here's the code from VCDS Lite

 

00792 - A/C Pressure Switch (F129)

35-00 - -

 

I was wondering would the Compressor NOT WORK due to him not clearing the code first via Vagcom? - It's a bit cold at the moment for A/C but technically I have a warranty until beginning of March and if it needs a new one I don't want to fork out lots of money - also I am not sure about renewing the warranty at the moment either.

 

Any pointers gratefully received.

 

Cheers

 

WJUK

[seatkid]

AFAIK it will clear automatically when the pressure switch is correct (i.e. pressure within range). Certainly on my Mk1, no need to clear codes when filling the a/c, it just starts working (and the CC panel stops flashing on start)

[MadBaz]

Same a s Seatkid on MK2, but took about 10 minutes before display stopped flashing and clutch engaged.

 

How did he check compressor before changing condensor? If no pressure then the clutch won't engage.

 

How did he know it was condensor? dye test?

Did he flush the system? Changing condensor will introduce crap into system and knacker the compressor..

Did he vac it for at least hour?

Did a new drier come with condensor?

Did he stick some oil in?

 

The fault you refer to was on mine a low pressure fault, could be same code for high pressure though.

Do you have rear air con? your n/s rear quarterlite won't open if you do. The reason I ask is that on the plate under the bonnet there are 2 figures for filling air con 750g for single evaporator and 1050 if a rear evaporator is fitted. If he's gone by the 2nd figure he's probably overcharged it as rear air-con is quite rare, common problem. It could be the switch itself, but from what I gather that usually shows as "short to ground" on vag-com.

 

Get back in touch with warranty co sharpish as this may get expensive, if a new compressor is required, usually for the compressors manufacturers warranty to be valid the system must be flushed and a new drier fitted.