philm32 Posted July 24, 2014 Report Posted July 24, 2014 (edited) Hi Air con not working been regassed has definitely got dual a/c filled to 1050,no leaks, no faults on vag com. Compressor is turning,feels free can turn by hand,had a mate who's checked wiring and found there's only 2.8 volts at the compressor connector which is intermittent allowing 2.8 volts every 3 to 5 seconds, I think it should be around 12volts??? Any ideas why this is happening?? It's a 54 plate 1.9tdi (130) thanks Edited July 24, 2014 by philm32 Quote
insanitybeard Posted July 24, 2014 Report Posted July 24, 2014 (edited) Is the compressor actually running/ engaging? Probably not if you've only got 2.8V at the compressor clutch connector! Could be a bad contact/ resistance somewhere in the wiring or an internal fault in the climate control panel or maybe a dodgy relay. If it was pressure switch related I wouldn't expect a 'partial' voltage, I'd expect either a full 12V to the compressor or nothing at all, though somebody may correct me here. Can you make the clutch engage if you manually apply 12V to the compressor lead terminals? Edited July 24, 2014 by insanitybeard Quote
philm32 Posted July 24, 2014 Author Report Posted July 24, 2014 No compressor not working, not climate control unit have tried another unit with matching serial numbers and didn't make a difference. Had a new pressure switch, tested the connection there and that's OK. If it's a relay any ideas which one? I noticed prior to not working the air con was very intermittent seemed to get more intermittent the warmer the day? The green wire at the compressor connector which is the one carrying the feed goes back to the fan?? Module Quote
insanitybeard Posted July 24, 2014 Report Posted July 24, 2014 If it's switched through the fan module (which makes sense as the fan must run when the aircon is switched on) then it could be an internal fault with the fan module. Do you know if the fan works? Quote
philm32 Posted July 24, 2014 Author Report Posted July 24, 2014 Fan works,turns on and off with air con when car first started(cold) but seems to stay on when up to temperature and never stops not sure if it should do that as other cars I have owned turn on and off as the water temperature raises and falls. looking at some other topics on the forums the aircon is linked to cooling fans. Any way of checking the fan module and where is it on the car? Quote
SilverBeast Posted July 24, 2014 Report Posted July 24, 2014 The consensus seems to be that the cooling fan runs all the time when aircon is on auto. Quote
philm32 Posted July 27, 2014 Author Report Posted July 27, 2014 (edited) Checked fans they work as they should, checked wiring from compressor back to a relay on the 2nd level of relays in the cab(ford told me there wasn't a relay on that circuit) (relay 454), could this relay reduce the voltage to the compressor, is there any way of telling if it's faulty or is it a case of buy a new one and try it, Edited July 27, 2014 by philm32 Quote
gregers Posted July 27, 2014 Report Posted July 27, 2014 where abouts are you?i have a compressor sitting in my garage,minus the clutch as i robbed it for my mk2 tdi 115bhp.dunno if they have the same code though? Quote
philm32 Posted July 28, 2014 Author Report Posted July 28, 2014 Thanks for the offer, but I'm sure it's down to electrics. If it's not and the compressor is knackered I'll definitely take you up on the offer. I'm in Leamington Spa, Warwickshire Quote
Russats Posted July 10, 2015 Report Posted July 10, 2015 where abouts are you?i have a compressor sitting in my garage,minus the clutch as i robbed it for my mk2 tdi 115bhp.dunno if they have the same code though?Do you still have this? Would it fit a 130bhp engine? Quote
gregers Posted July 10, 2015 Report Posted July 10, 2015 yep still got it,the code is in my for sale thread of bits i have. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.