[urq] More a/c help please

[Justin Riley]

I have had the pleasure of replacing the expansion valve on both of my quattros.  It is not very expensive (~$45), but it is a pain in the butt.  You must remove the evap core to do it.  Once out, the replacement is pretty easy, but very messy.  (I didn't replace the rubberized stuff it is wrapped in, just uncurled it and put in the new expansion valve, then squeezed it all back together.
 
It cured my pressure problems on both cars.  One had not even been opened for debris to enter.  It had a leak and was empty, but complete when I bought the car.  They seem to be able to clog by not being used, and not under pressure.  I suspect that the oil turns to goo and clogs them over time.  Or causes them to stick.
 
-Just a guess,
 
-Justin R.
 With working R-12, cause R-134 won't with the stock mini-york in Florida!  (ask me how I know)
 

________________________________

From: urq-bounces at audifans.com on behalf of Brandon Rogers
Sent: Wed 8/17/2005 1:50 PM
To: Urq List
Cc: 200 20V List
Subject: [urq] More a/c help please



Guys-
so the saga continues.  patient is '84 urquattro with 3B motor including the big 200 20V radiator fan. Stock urq a/c system otherwise - except it's R134 now - was converted 2 yrs prior to motor swap and it worked fine until the swap when I removed the big line.   Fan comes on Stage 2 when a/c "on" and high pressure switch "closes".  The system has sat idle for about 2 1/2 yrs since I did the motor swap.  I had removed the "big line" from the compressor through the middle of the engine bay and over to the firewall.  While removed, I securely plugged the hole in the compressor with a rubber grommet.  I also covered the open pipe end at the firewall with tin foil (multi layers) and secured it with a hose clamp - so the system should not have been exposed to much debris, if any.  My a/c guy is telling me the system pressure, I think he said is all over the place - whatever he said, he said it's likely due to a sticking/clogged/whatever Expansion Valve at the Evaporator.

Anybody have experience with this?  If I drive it a bit and build some pressure what are the chances it will free up?

Any tips on replacing this part?

As always - thanks guys-

Brandon
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