Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Can you get me the high and low side readings with ac off.
The readings point the orifice tube being restricted which will cause a higher than normal low reading and will prevent the system from equalizing when ac is off.
The only other cause I see would be a slightly weak compressor
The pressures are what one normally uses in determining whether the compressor is good or not. Higher than normal low pressure reading is usually either restriction in the orifice tube or weak compressor on the suction side. Couple that with the high side not getting over 250psi, those do indicate a weak compressor, along with inability of the system to equalize.
Yes, based on the readings and symptoms.
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Yes, that is fine
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this has front and rear ac in this vehicle ?
can i ask did you add oil to the system and how much did you add total when those parts where changed ?
can you try 2 things next
with the ac running and the truck on if you spray water on the condensor with the hose will the low side drop down and will it cool when your running water on the condensor ?
if not with it running drop out some freon until the low side reads 28 to 30 with the compressor running and will it then cool ?
so you dropped it down to 30 on the low side and it is still not cool ?
do you still need help??
read through it already
couple of questions
1. what are the pressures now with the ac off??
2. did you add all the oil to the freon system or compressor 5 oz and 2 in the freon system.
ok, good the static pressure should be at ambient temp and equal. ant variance indicates an issue with the orfice tube.
high sides should be 2 times outside temp plus 15%
low side should be 25-30.
inside air temp or duct temp should be 30% lees than ambient temp as well.
the low side is definitely high and your high side is as well.
it almost sounds like you are overcharged. did you use a ac machine to add the freon or cans???
so, you only have 1.5 lbs in the system???
did you check the rear orfice tube
the high low side is either a orfice tube or restriction in the evap
what color orfice tube did you install?
was it the same color you removed???
if all you say is true we have eliminated it down to this. before doing it. I would flush it first and see if there is any debris in the core
it has been years since I did one. I remember getting it at NAPA but dont remember the name
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