90 20V Quattro 1989 model Aircon

[Rick Cone]

If it turns on and turns right back off, my dollar is on a stuck txv (a valve that should be somewhere right around the firewall on the evaporator).  It will cause the pressure to rapidly increase, turning off the compressor.  

Definitely get it evacuated, vacuum tested and refilled.  It's worth the money.  I would automatically replace the drier.



----- Original Message ----
From: Mark R <speedracer.mark at gmail.com>
To: whitehill <rhayllar at bigpond.net.au>
Cc: quattro at audifans.com
Sent: Monday, February 25, 2008 6:20:56 AM
Subject: Re: 90 20V Quattro 1989 model Aircon

All systems have a high pressure and low pressure switch.  These protect the
compressor (and the entire system in the case of high pressure) from failure
due to either condition.  It's likely your system needs evacuated, tested
for leaks, and refilled.  If it's not been used in quite a while, or quite
low, the full evacuation is important.  Prepare to replace some seals where
they've dried out and started to leak.

Mark Rosenkrantz

On Sun, Feb 24, 2008 at 9:02 PM, whitehill <rhayllar at bigpond.net.au> 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?
>
> And where do I find it?
>
>
> Does the unit have to be modified to re-gas with ozone friendly
> refrigerant?
>
> Thanks in anticipation
> Rick
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