Re: What is the low psi for the air conditioning on a...
Generally speaking, with outside air temp at 80 degrees, and the engine at idle speed, the low side should be around 35psi. High side would be between 200 and 250 psi.
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The low side will not tell you if the system is overcharged or not. You would need a gauge hooked up to the high side to know that. It could be a relay, ac clutch, or pressure switch problem. 35 - 45 psi on the low side is normal
The fuel pressure sounds too low. Is it multi-port injection? Check the fuel pressure against your specs for the car and engine. MPFI systems usually require 40-50 psi.
Thats pretty high if the system is not running. Average pressure on the low and high side should be near outside air temp. Normal low side is 30-40 psi and high side is 200-250 psi when the system is running and the freon charge is full.
For charging purposes, you really should be monitoring the low side pressure. Depending on ambient air temperature, the low side should be between 30 and 50 lbs PSI. The high side can be between 135 and 330 lbs PSI.
First, I would check that the a/c compressor is on at idle.
Then, I would check that the fan goes on.
After, that I would check that the plumbing is getting cold on the low side. If it is not, then I would look for causes for that, including but not limited to the r134a refrigerant pressure being too low.
It should read 25 psi to 45 psi on the low side when the a/c compressor is turning, which is normal.
If it reads 75 psi to 100 psi or higher and the a/c compressor is not turning, then there is a problem.
The a/c compressor could be wearing out (its pistons that is) and causing the pressure to not be high enough at idle speed.
Recharge the system through the low side fitting, with the engine running you will need to have 25-30 psi on the low side gage, add freon a little at a time until this pressure is reached with the engine running and the compressor engaged.
The a/c requires r134a freon the low side fitting is on the a/c accumulator on the passenger sideof the engine compartment. Charge through the low side until the comp energizes and the low side pressure is around 25-30 psi ( with the comp on )
refrigerant is added at the low side charging port, this port is located in the low side AC line from the AC compressor, it is the larger of the two AC lines from the AC compressor, you add until the pressure is stable at around 28-32 PSI with AC on.
Look for a leak in the system, this is because, if you have a leak there is a low pressure switch that prevents the compressor to turn on when there is low or no refrigerant pressure.
Also, perform a pressure check, this is about 68.5 psi and 70 psi with the system and compressor running.
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