Reply With Quotehave you checked the fuses ontop of the battery?
Volkswagen Fan
Basically got my a/c regassed last night thinking that was why my aircon wasn't working. Did a leak test, nothing came up. I can hear the compressor engage when I turn the temp all the way down(climatronic system) and the revs change as I do it. Anyone had this sort of thing happen? If the compressor engages does that mean that it should be working fine? Thought I'd throw this one out there and see if anyone comes up with anything. I know A/c systems in our cars cost the earth to fix. So i might just have to deal with it not working. haha
Is there any checks I can do?
Volkswagen Fanatic
have you checked the fuses ontop of the battery?
Passat 1.8T K04 | Audi A3 1.8T | Bora 4Motion
Volkswagen Fan
I havn't checked them in aaaages, so I guess that would be a start! Any other ways that I can check for problems? I have got a cheapo ebay cable and VCDSlite but I can't for the life of me get it to work. So I can't diagnose it to see if I'm getting any errors.
Volkswagen Fanatic
Are your fans kicking in straight away and pulsing?
Passat 1.8T K04 | Audi A3 1.8T | Bora 4Motion
Super Moderator
VWwA Super Moderator
You would need to look at the compressor to see it engaging.
The engine note changes when the AC system calls for the compressor to enagage, does not mean it is actually engaging.
Check the restance on the field coil.
MK4 GTI - Sold
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Volkswagen Enthusiast
definitely check this - the ac gets its power from the low speed fan circuit. The fans have internal resistors that help regulate fast and slow speed. They have a habit of burning out. With one fan out, things still work, but once both fans have gone you also lose the ac. I am currently fixing exactly this.Originally Posted by BL33SU
The most likely causes of ac failure are usually the thermo fans and then the fan control unit, well before failure of major parts like the compressor....
With the car on, engage the ac, both fans should come on. They are not dependent on load, time , engine temp to turn on with the ac - so if the ac is on, so should be both the thermo fans.
Volkswagen Fanatic
i have the same issue actually lol..
just too much of a headache... i changed my fan control module but still no go!
how do you test the resisters?
Passat 1.8T K04 | Audi A3 1.8T | Bora 4Motion
Volkswagen Enthusiast
Fans definitely need to be working to cool the gas back to liquid if they do not work no a/c!! If fan module has been replaced might be fans.
Volkswagen Fanatic
only thing worrying me about changing the fans is they still kick in, but pulsing all the time and straight away once i turn the keys.
could it be thermostat?
Passat 1.8T K04 | Audi A3 1.8T | Bora 4Motion
Volkswagen Enthusiast
The fans dont cool the gas, it's that the power feed for the ac compressor comes from the slow fan circuit.
here is a fan check, ignore the type of car, still the same operation:
http://pics.tdiclub.com/data/517/199...oner_check.pdf
Here is how you can fix the fans:
Fan Failures are often repairable - TDIClub Forums
And here is the way I am doing it, Instead of replacing the fan resistors (bigger job than it sounds) or buying new fans (which will still have crap resistors which will burn out over time again, and cost heaps...) you bypass the fan resistors and put two new big beefy ones in circuit. Total cost to me was $8 for the resistors (from China), $5 for scrap aluminium and I had the wire, hooking mine up tomorrow...
This fan repair modification was developed for a 2002 model V5 Golf, it will probably be OK for other Golf models especially the V6
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