karlak
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| posted on 13/8/14 at 04:56 PM |
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Tintop airconditioning
The aircon on the 1.2 SXi Corsa has not been working since we got the car a few months back, so I though it was time to sort it.
I have taken it for a regas today which showed that it still had pressure and 480g of old gas was removed, it has been cleaned and regased with 650g
of new gas, pressure tested and all appears OK.
However, we still get no cold air.
The orange light lights and revs drop when the AC button is pressed as expected -
The "centre" part of the compressor doesn't rotate when the switch is off and on - It will turn by hand so not seized.
I understand there will be a "low pressure" switch somewhere, does anyone know where it is and how to test it ? Can I test for 12volts on
the compressor plug ?
Any help much appreciated.
Cheers
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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mark chandler
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| posted on 13/8/14 at 05:13 PM |
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If you drop 12v straight onto the compressor wire then the pump will run and the system will work without the security so only do this to test.
Hand on the pipes, one should get hot, the other cold which will prove the compressor, do this first incase it's flaps in the airbox not
working, after that it's manual out and work out which bits do what and bypass until you get the correct conditions to run the compressor I,m
afraid the refrigerant will need to be removed to replace pressure switches.
If the revs drop it sounds like it's working tbh
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big_wasa
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| posted on 13/8/14 at 05:13 PM |
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There is a 12v magnetic clutch at the compressor so you will be able to turn it by hand if its not engaged. I have half an idea how fords work as the
ac is controlled by the engine ecu.
I would start and see if your getting power out of the compressor relay and fuse.
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mark chandler
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| posted on 13/8/14 at 05:38 PM |
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Another possibility is the clutch us working but the drive has a shear pin, you get this on VAG cars so if the compressor seizes it still appears to
be okay 
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rusty nuts
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| posted on 13/8/14 at 06:09 PM |
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Check for power down to the compressor clutch before doing anything else. Some compressors have a diode that can fail causing the clutch not to work ,
it may be possible to bypass the diode
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morcus
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| posted on 13/8/14 at 07:49 PM |
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I was under the impression that once you got to the point where the AC does pretty much nothing when it's on it's fubarred, that said on
the two new(ish) cars I've owned I've had the system serviced annually to keep it good, and the hit and miss ones I've had in old
cars I've not bothered with.
How long have you been running it since you've had it gassed?
In a White Room, With Black Curtains, By the Station.
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karlak
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| posted on 13/8/14 at 08:12 PM |
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quote:
Originally posted by morcus
I was under the impression that once you got to the point where the AC does pretty much nothing when it's on it's fubarred, that said on
the two new(ish) cars I've owned I've had the system serviced annually to keep it good, and the hit and miss ones I've had in old
cars I've not bothered with.
How long have you been running it since you've had it gassed?
Ran it for around 30 mins since regas, but observing the compressor it is not kicking in.
Apparently, a regas can "bring it back to life", if the pressure had dropped too low. Mate had his Golf regas'd last month which
fixed his Aircon, the pressure had dropped too low.
We only picked this car up recently as a first car for my Son, so I am not sure how the air-con has been treated.
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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morcus
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| posted on 14/8/14 at 06:14 PM |
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First car shouldn't have working AC anyway
In a White Room, With Black Curtains, By the Station.
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karlak
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| posted on 14/8/14 at 06:30 PM |
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quote:
Originally posted by morcus
First car shouldn't have working AC anyway
It bloody should when i borrow the thing 
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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