Air con still not working.....

[vorloc]

Hi,

I hope someone can shed some light on the problem i am having, dont know what to do next.

The story so far.........I just purchased a 2004 A4 TDI Avant, the air con wasn't working when i brought it but i was assured it just needed a regas , this seemed plausible as the car had not been used for over a year. On the drive home i noticed the the Econ light would not turn off and assumed this was because the gas was low.

So had it regassed last week, the garage said it appeared to have gas in already but was a little low, i agreed to have it vacumed and refiled, i was hoping that this would cure the problem.......Alas it didnt.

Next i had it scanned and it showed a fault code G65 high pressure air con switch faulty.
So off to Audi for a new one, Bargain at only £55....Not! anyway a small price to pay for the cold air i was expecting to pour from my vents. I had it fitted today and still the same.....No cold air. The fault code was cleared and when re scanned there is no fault showing so the G65 switch fault has gone away and the Econ light can be selected on or off, BUT the air con still doesn't work and no further fault codes are stored????

I dont know what to do next? I cant afford to put it in the dealers, I am still skint from paying for the car. Anyone got any ideas as to what is going on?

any ideas appreciated......

Cheers V

[phil miller]

is the AC compressor kicking in?

[vorloc]

No the compressor does not kick in.......

[dan.taylor.1]

Have you or the garage checked the fuses? or that there is a live to the compressor when the button is pressed?

Dan

[vorloc]

Thanks for all your replys,
I had some time this afternoon so had another look, i put a probe on the power supply to the compressor with the Econ light off (A/C on) and there was a live and earth, with the Econ light on (A/c off) i only get 2 earths. I guess this means the compressor is dead if power is there and it doesnt work!
Do you guys think its new compressor time??
Cheers

[nevo]

Could be the pulley clutch failed.

[dan.taylor.1]

Which are replacable seperate to the compressor iirc.

Dan

[fla]

how did you get the econ light to go off Vorloc? Mine is moreorless permanently on. I just need to test the compressor directly - i couldnt trace the wiring back from the compressor looking at it from underneath - perhaps you could advise?

[vorloc]

I changed the G65 sensor which was showing up as a fault, that sorted the Econ light not going out. I tested the compressor by unpluging the wires at the compressor and probed the terminals with Econ off and on, i had the correct power at the compressor but i didnt work so the compressor is at fault!

[dan.taylor.1]

Vorloc its most probably just the clutch pulley, you can replace them separate to the comp. iirc.

Dan

[Dave Avant]

Have you checked the pulley plate is there? Its a common problem for them to drop off and dissapear, if you're lucky drop onto the engine cover tray.

This is what mine was like, power at the plug, new G65 sensor but air con comp not kicking in, found the pulley plate had gone walkies.

Have a look at the face of the pulley, if it has a hole in the middle and you can see a small splined shaft then its missing or basically if the plate is there it will be smooth across the face with a small 10mm bolt in the middle of it. You may need a small mirror to see properly.

You can buy the pulley and plate seperately.

[vorloc]

Thanks Dave, I will check the pulley.