aircon gone

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Jun 10, 2005 | 07:33 PM

kosh

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From: Wolverhampton. UK

aircon gone

ive had my 964 for 3 years and just as summer arrives here ive noticed that my air con has stopped working.
Is this a simple fuse or is it something more sinister??

Jun 10, 2005 | 08:03 PM

Smokin

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From: Pasadena, MD - Land of Taxes

Can you answer a few questions?

1. Does your compressor engage? If so... But it blows hot... You may need a recharge... Which is fairly common.

2. Your compressor doesn't engage? Check all your fuses and relays first... I just had the same issue... They had to jumper my compressor to kick in... But now it does it by itself. They say that it just needed to be "energized" a time or two to work itself out.

You may also want to do a search to see what others have run into... You may be able to more closely match your symptoms to an eventual fix!

Welcome to Rennlist... Good Luck and please post back as to what the issue turns out to be.

Rick

Jun 11, 2005 | 03:33 AM

frankvan

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From: St. Albert, Alberta, Canada

On mine the blower for the unit in the front left fender is seized and I believe someone previously mentioned that when that happens the a/c won't engage. Also someone mentioned that the non-functioning a/c can damage the CCU (climate control unit) but not sure how or why so I pulled the a/c relay from the fuse block. Be careful if you do pull the relay that you pull the a/c blower relay, not the oil cooler blower relay - They are identical and next to each other on the fuse/relay block.

I;m not sure about the 964 but most cars have a pressure switch of some sort in the system and if there isn't enough freon (or whatever) they prevent the compressor from engaging so as to prevent damage to the compressor (there is lubricant in the coolant to lube the compressor).

Jun 11, 2005 | 06:32 AM

kosh

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From: Wolverhampton. UK

How do i know if the compressor engages? the light on the AC button lights up but the blower still blows slightly warm.

Thanks for your help

Jun 11, 2005 | 07:35 AM

springer3

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From: Atlanta

Quote:

Originally Posted by kosh

How do i know if the compressor engages? the light on the AC button lights up but the blower still blows slightly warm.

You will see the inner part of the compressor pulley turning. The outer ring turn with the belt, but the compressor shaft turns only when the clutch is engaged.

Good luck. Atlanta just had a week in the "double 90s". Miserable, but unbearable if the AC is out.

Jun 11, 2005 | 07:47 AM

robbed666

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From: Portsmouth UK

Quote:

Originally Posted by kosh

How do i know if the compressor engages? the light on the AC button lights up but the blower still blows slightly warm.

Thanks for your help

Start the car (AC switch OFF), open the hood, you will see the AC compressor to your right. It has a belt connect to it at an angle. The belt will be moving, but the centre hub of the compressor wont be, (shouldn't be). Switch the the AC switch ON, and the the clutch should engage, and centre hub of the AC compressor now should be tuning as well.

Disclaimer: Keep your hands, small children, furry animals etc, etc..... Away from the running engine etc, etc.......

Jun 11, 2005 | 08:45 AM

kosh

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From: Wolverhampton. UK

Thanks.
I think Ive located the AC compressor, excuse my ingorance, this is the large metal unit on the right of the engine bay as you look in attached to a belt from the main engine fan (i thought it was an alternater!!! from my VW beetle days! the two pipes coming off it did use to confuse me though!!!)
OK.... Ive run the engine like u said Robbed666 and the centre doesnt spin regardless of the switch being on or off.
I then checked the fuses like smokin suggested its number 39 I think (it doesnt actual label AC anywhere on lid). I dont know which relay to test and I dont know how to even go about testing one!!!

So if i assume the fuses/relays are ok what does 'energising' it a few times mean smokin? maybe I should try that next.

Thanks again everyone

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Jun 11, 2005 | 11:08 AM

robbed666

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From: Portsmouth UK

Quote:

Originally Posted by kosh

Thanks.

OK.... Ive run the engine like u said Robbed666 and the centre doesnt spin regardless of the switch being on or off.
Thanks again everyone

Thats your problem (or at least one of them). Now you know what and where the compressor is. You will see two black wires come from behind and to the right of the hub. One black wire is bolted to the pump body (check it has a good clean connection). The other black wire joins the wiring loom on thr rear right chassis rail (green wire), check this is connected. To go ant further you will need a multimeter. You need to check first the AC clutch coil isn't open circuit, and 2nd, that there is a 12 volt supply to the AC clutch when the AC switch is on and the engine running. Also check the heat control is set to the blue dot, and the fan is switched on. The Relay for the AC clutch is in the LH fuse box in the engine compartment. There is a system pressure switch in the trunk. (All the above is assuming that there is reasonable charge of refridgerant in the system).
HTH

Jun 11, 2005 | 12:42 PM

#10

Colin 90 C2

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From: Delaware

You can take of the valve cap that is pointing toward the rear of the car and quickly tap the valve stem to see if you have any escaping freon. If you do, then you probably need a recharge, If you do not then you have a major leak somewhere.