R134A conversion, did not work!

[colin cohen]

My SQ has a pressure switch mounted adjacent to the drier canister right
behind the front grill. It is earthed by a black wire and a red wire lead to
the compressor.  We jumped the switch without effect and then jumped the
terminal on the compressor.  We heard clicking from a solenoid behind the
instruments, but no reaction from the clutch.

Having removed the compressor, we have been calling around to find someone
who might be prepared to do an overhaul. We cannot tell them what model or
type it is because it has absolutely no markings on the casing.  An outfit
in Florida called Polar Bear (?) has agreed to look at a jpg to ascertain
whether they might be willing to overhaul the thing.

Anyone else have any suggestions?

Colin
----- Original Message -----
From: "Avi Meron" <avim at pacbell.net>
To: "colin cohen" <ccohen5 at compuserve.com>
Cc: "Quattro" <quattro at audifans.com>
Sent: Thursday, May 17, 2001 5:26 PM
Subject: RE: R134A conversion, did not work!


>
> I am not sure about your 84 but the later cars 86 and up have a switch
under
> the cowling by the windshield which has a low pressure switch on.  You
have
> to remove the switch to get to the pressure port.  The switch has be
JUMPED
> in order to get the compressor to engage!
> Again I am not familiar with early models but on the 86 and up, you must
do
> that to get the refrigerant in!
> Good luck,
> Take care,
> Avi8
>
> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of colin cohen
> Sent: Tuesday, May 15, 2001 1:21 PM
> To: qlist
> Subject: R134A conversion, did not work!
>
> Taking a cue from the list, i decided to dispense with repairing my R12
> system and convert.  I bought the quick release screw on adaptors, and
from
> there forwards encountered a host of problems.  Here are some of them and
I
> would welcome any light that can be shed thereon?
>
> 1) We found that the low pressure adaptor supplied in the kit did fit, but
> the high did not.  The Audi dealer suggested that I purchase the Mercedes
> version which did fit.
>
> 2) The found two service ports on the compressor and one on the drier.
The
> Drier was marked "S" which I believe means "suction" or LP.  The ones on
the
> compressor were marked D for discharge I think, and the fitting
corresponded
> with the HP version from MB.  There was another fitting that was the same
> size as the dryer and I assumed it was an LP unit.
>
> 3) So we evacuated the R12, but not finding a flushing material assumed
that
> there was no need to do so??
>
> 4) Then loaded 2 cans or 24 oz of R134A.  Tried to get the clutch to
engage
> but it would not.  We heard a solenoid clicking behind the dash when we
> jumped the HP/LP switch but no clutch "click" from the magnet.
>
> 5) Then we tried to load the oil/dye.  Very little went in with or without
> the engine running because the compressor would not engage.
>
> At this point, out of ideas, with nothing in the Bentley, we decided the
> little used compressor that was working a month ago, had lost its clutch
and
> therefore needed to be demounted.  Not having anywhere to evacuate the
134,
> we released it into the atmosphere (woe is us, truly) and dumped the oil
> that did make it into the lines all over the car and garage.
>
> The idea now is to get the compressor checked and repaired if necessary.
> Then we want to start again.  Anything wrong with what we did first time
> around?
>
> I am tempted to go to an A/C shop but the car is an 84 Sport Q. with what
> seems to be a York compressor but there are no markings on it at all.  I
> don't want to run the risk of a monkey messing up my intercooler, oil
lines
> and the like and really trust the guy who is doing the work on this.  Only
> thing is neither of us have experience with this type of job.  Actually I
> feel that its really travesty to be spending time or money on a/c for a
car
> like this, but then this is 'Merica where creature comforts come before
> everything, right!
>
> Thanks for any input.
>