A/C help needed, 68 Factory A/C - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 2 (permalink) Old Jun 11th, 02, 04:18 PM Thread Starter
Senior Tech
 
Join Date: Aug 1999
Location: Ontario, Canada
Posts: 564
Ok Guys, I need some big time help here, I am tired of a good guess, tried that already,
On my 68 with factory AC, I switched over to 134 last year, it worked but not great, several times when I turned on the AC the belt would squeal big time, but then it started to work. This year I turn on the AC and I get nothing but warm air, After running 5 minutes, the low side hose from the compressor frosts up to the bleed tube on the POA valve, even the compressor is getting cold. The line from the expansion valve to the evaporator is not cold, the outlet of the evaporator is not cold.
So today I replaced the POA valve and the expansion valve with two brand new units, same thing,
Any ideas??????
Does the 68 system use a filter screen and where is it located??
The parts guy lists two expansion valves for the 68, With and without accessory air, I went with the Without accessory air.
It was a little smaller than the original but had two capilary tubes and fit proper.
High side pressure 120 - 140
Low side is reading high 90 plus
Steady readings.
Thanks for the help.
Rob
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post #2 of 2 (permalink) Old Jun 11th, 02, 05:49 PM
 
Join Date: Jan 2002
Posts: 1,035
Theres definitly a restriction on the low side. I don't know of any filters in the system other than the drier and the screen in the expansion valve. The low side is freezing up because the restriction is creating an orifice. The small tube from the exp. tube to the POA is a 'signal' line letting the POA know of the evap pressures. It appears that the POA is creating an orifice (closing) because it's seeing low pressures from the 'signal' line. Seems like the POA is acting like an expansion valve. Your high side readings arent that bad since the ambient temp in your area is let's say..65-70??? If they're under 70 degrees, your high side readings are fine and I'd suspect a restriction in either the evaporator or a restriction in the line from the exp. valve to the POA...

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