Automotive Air Conditioning Information Forum (Archives)

Railroader on Tue July 28, 2015 4:40 PM

Year: 1996
Make: Chevy
Model: Corsica
Engine Size: 3.1
Refrigerant Type: R-134A
Ambient Temp: 95
Pressure Low: 29
Pressure High: 200
Country of Origin: United States

Just got through Charging the AC on my son's 1996 Chevy Corsica 3.1 new compressor install (Old one Leaking, No black Death)
Flushed the Condenser only, Pulled Vacuum for 1hr 20min, added 36oz R-134A , I have refrigerant scales. added 5 oz pag 150 to the compressor, turned a few turns by hand after , added 4oz to the Accumulator when installing.
95F Ambient Temperature, Low Side 29, High side 200
Vent temp appears to be a little High to me, at 62 deg F. Has lots of condensation though.
What are your thoughts on this? Thanks

Edited: Tue July 28, 2015 at 6:37 PM by Railroader

mk378 on Tue July 28, 2015 7:06 PM

The V5 has an oil plug on the side, you should have put all the system oil in there instead of in the lines. Hopefully it will find its way.

It could be reheating from the heater core. The vent air should be within 5-10 degrees of the temperature of the evaporator outlet pipe.

Railroader on Tue July 28, 2015 8:46 PM

Yes, I removed that plug, and drained the oil out of the new compressor and replaced it with 5 oz of new Pag 150. My son said he thought the heater might not be shutting off completely, said warm air had been coming out the vents with a/c off and heat control on cool. this was before I repaired the A/C. I do not know what controls the heat or water flow on this car.

GM Tech on Tue July 28, 2015 10:41 PM

Check your temp door for fully closing

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

mk378 on Wed July 29, 2015 8:40 AM

GM cars typically do not have a water valve; the heater core stays hot all the time. They depend on the air door closing it off completely.

The heater core is also the bypass loop to circulate coolant through the engine before the thermostat opens. Do not merely block off the heater hoses as that will risk engine damage from hot spots.

Edited: Wed July 29, 2015 at 8:44 AM by mk378