90 20V Quattro 1989 model Aircon

whitehill rhayllar at bigpond.net.au
Mon Feb 25 17:02:31 PST 2008


Thanks Kent
I am convincing myself that it needs a recharge.
What I don't know yet is whether the unit has already been modified to 
accept the R-134a. I know the previous owner so I will ask him
Rick
----- Original Message ----- 
From: "Kent McLean" <kentmclean at comcast.net>
To: "whitehill" <rhayllar at bigpond.net.au>
Cc: <quattro at audifans.com>
Sent: Monday, February 25, 2008 10:49 PM
Subject: Re: 90 20V Quattro 1989 model Aircon


> whitehill wrote:
>> Hi helpful crew.
>> I aircond has stop working.
>> I have diagnosed this far
>> Push the aircond button and the magnetic clutch does not pull in although 
>> I can hear a relay somewhere under the dash pulling in.
>> I pulled of the wire to the magnetic clutch and put 12 volts on it and it 
>> pulls in but and seems to run OK when I start the car but it will not 
>> cool - perhaps that it needs re-gassing.
>> Is there a sensor somewhere that detects low pressure in the compressor?
>
> G'day, mate. I'm not going to be much help, but some help is better than 
> none.
> You diagnosis sounds reasonable. The AC tries to run, but then some sensor 
> shuts it down.
>
> I don't know about a low pressure sensor; there may be. Here's a link that 
> may help you find one on your Audi:
> http://wiki.answers.com/Q/Where_is_the_AC_low_pressure_sensor_on_a_2000_Pontiac_Grand_Prix
>
> I do know there is a low temperature sensor; they AC won't come on if the 
> outside temperature drops below (or near) freezing. Although you are still 
> in your summer, if that sensor fails, it might be shutting off your AC.
>
> As for the gas -- unless it has  been converted, it is probably R-12, 
> which studies have shown to be harmful to the ozone layer. It can be 
> replaced with R-134a (HFC-134a), but requires modification to the valves 
> used to fill the system. No big deal, adapter kits are available. My 
> Google searches suggest you don't need to replace the much else. If Oz is 
> like the States, you may not be able to get  R-12 (or it may be too 
> expensive).
>
> You may find more here:
> <http://www.sjmautotechnik.com/trouble_shooting/ac.html>
>
> HTH.
>
> -- 
> Kent McLean
> '99 A4 Avant, w/ quattro, V6, Tiptronic. "Yeah, Baby!"
> '94 100 S Avant, "Moody"
> '91 200 TQA #1, undecided
> '91 200 TQA #2, up in smoke 2
> '89 200 TQ, "Bad Puppy", up in smoke
> 



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