Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for you question, from looking at your reading you you have either an overcharged system or the compressor has failed. Normal pressure on a properly filled system should be right at 35 to 40 PSI on the low side and 200 to 225 PSI on the high side with the compressor running. If no Freon has been added then its most likely a failed compressor. If Freon has been added the you need to recover the Freon and evacuate the system and recharge it with the proper amount and recheck the operation and pressure readings. Post back if you need more help and or information and we can work from there.
Its not very common but if you have 70 PSI on the suction side (low side ) that sure indicates the compressor is not sucking the pressure down.
Both the low side and the high side should equal out and normal pressure on a properly filled system should be right at 100 to 110 PSI on both the low side and the high side with the compressor off. Are you 100% sure the system is not overcharged?
26 is the correct amount and in most cases if you have a restriction the low side (suction side) would go into a vacuum with the compressor running. and drop the low side pressure.
Any type of restriction in the system would cause the compressor to go into a vacuum on the low side if the compressor is sucking as it should be.
There are only two things that can cause the reading to be high on a running compressor , either the system is over charged or the compressor has failed.
Okay well then something is sure being missed here. Are you sure your charging system is accurate and you are actually adding the correct amount of Freon?
Well with the reading is appears to be over charged. The system calls for 1.6 LBS so the level should be right. Something is being over looked here and at this point I am not sure what. You have covered everything I can think of. If you would like, I can open the question back up and see if someone else has anything new to add.
Hi there, I am Cam. Give me a couple moments to review what you and Ron talked about.
OK I have a question. During all the replacements, what happened to the oil in the system? Did you replenish any oil? Did you balance out the oil from the compressor? Also prior to this, what repairs or parts were replaced?
OK, do you get any cold air when driving at all now or is it just cool or outside temp?
Have you tried pulling out some of the refrigerant and putting in a bunch less? I am wondering if its possibly overcharged, and your cans while saying up to 24 oz actually contained more causing this. Can you pull some out and see what happens?
Ok so no change. The orifice tube, was that every changed?
Ok, so I would like to try flushing. What we do is recover the system, remove the orifice tube, put the line together and use our AC machine to flush fill the whole system with R134A, then pushes it all through cleaning EVERYTHING out. Then we put in new oil, 8 oz and charge it.
Also let me ask this before we go to far, how long does the compressor run?