Need to know high side pressure - Saab 9000 Bulletin Board - Saabnet.com
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You really can't be do a diagnosis with just low side readings, you need to see what the high pressure side of the system is doing. I use a Harbor Freight R134a gauge set purchased on sale for $40 and it works great.
Just trying to visualize what is going on from the physics involved it sounds like refrigerant is changing state to gas inside the high pressure pipe going to the expansion valve instead of inside the evaporator.
Also just an FYI, I've found about the best price on hydrocarbon refrigerants is direct from Enviro-Safe at es-refrigerants.com. A case of twelve six-ounce cans is $50 plus a few bucks shipping, and the stuff has dye in it for leak detection. They also have an electronic leak detector for $50 that is supposed to be able to detect HC refrigerants, I ordered one to try out. (Leaks aren't always in a place you can see with dye and a UV light.)
posted by 38.78.19...
Posts in this Thread:
- help diagnosing a/c problem, TML
, Fri, 2 Sep 2011 16:01:33- buying gauge set, TML
, Sun, 4 Sep 2011 08:07:04 - High Side Pressure?, marvinstockman, Fri, 2 Sep 2011 16:48:07
- Re: help diagnosing a/c problem, JerseySaab
, Fri, 2 Sep 2011 16:18:35- Re: help diagnosing a/c problem, TML
, Fri, 2 Sep 2011 17:39:25- Re: help diagnosing a/c problem, JerseySaab
, Fri, 2 Sep 2011 20:48:29 - Re: help, derf, Fri, 2 Sep 2011 20:03:05
- Re: help, TML
, Sat, 3 Sep 2011 04:33:18- hmmm., derf, Sat, 3 Sep 2011 07:21:22
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