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Very low pressures

mobetter on Fri March 25, 2011 9:21 PM User is offline

Year: 2001
Make: Dodge
Model: 3500
Engine Size: 5.9
Refrigerant Type: 134
Ambient Temp: 80
Pressure Low: -20
Pressure High: 120
Country of Origin: United States

System just went through a complete flush, new receiver dryer, all new o rings, fresh oil, and charged with 2 lbs. System worked perfectly nice cold vent temps.
while doing some maintenance on the vehicle the ac developed a leak. traced it down to the manifold hose on the compressor. replace hose pulled vacuum, and recharged. now the gauges show a vacuum on the low side and on a little over 100 on the high side. obviously it doesn't cool. is there a restriction in the or-face cause this?

TRB on Sat March 26, 2011 4:33 PM User is offlineView users profile

Pressures should be close to 40/200 at that ambient. If you pull a vacuum and recharged with 32 ounces you obviously should not be pulling into a vacuum on the low side. Need to retrace what was done during the repair. Was the orifice tube replaced and inserted backward?


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Edited: Sat March 26, 2011 at 4:35 PM by TRB

mk378 on Sat March 26, 2011 7:50 PM User is offline

That is consistent with a blocked orifice. Has "stop leak" ever been used in the system?

Also the compressor should have cycled off before the pressure gets that low.

mobetter on Sun March 27, 2011 11:45 AM User is offline

OK found the problem, but feel like an idiot.
Whenever I do work on ac systems I have this tendency to use rubber stoppers to plug anything I open to keep any contaminants out. I left a stopper in the outlet port of the dryer.
I pulled a vacuum and recharged now its blowing ice cubes.
Thanks everyone for your help!

HECAT on Mon March 28, 2011 11:20 AM User is offline

Leaving a plug in place is not as uncommon as you may think.


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