Engine Size: 350
Refrigerant Type: R134a
Ambient Temp: 90
Pressure Low: 80
Pressure High: 80
Country of Origin: United States
I'm trying to get the a/c up and going on my wife's 76 Corvette. The system has been converted to R134a. I have replaced evaporator, new desiccant, total flush, and lengthy vacuum and leak check. The A6 compressor clutch is engaging but the pressure has equalized with a low high side reading of 80 and a high low side reading of 80. Has my compressor gave up?
With compressor engaged and equal pressure. It is a good chance your compressor is not working correctly if fully charged.
I don't have it fully charged. I couldn't get any more refrigerant to draw in other than 16 oz. What's going on with it? Thanks!
Did you close your valves on your gage set when taking the readings? Otherwise you are bypassing the system and pumping thru your gage.
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......
I don't think I understand you correctly. I have the low pressure guage valve open when charging and high pressure gauge valve closed. I have the coupler valves open on both high and low charging ports. My readings are obtained through this proceedure. Please explain. Thanks!!!
If the couplers that attach to the car at the ends of the hoses have manual valves on them, they need to be open. The knobs/valves on the manifold next to the gauges need to be closed.
I bought a can of 134a at w**-mart that had a stop leak, oil, and dye in it. It also had a hose and a gauge, so now I'm an AC pro!
Both manual couplers are open and Low side gauge valve is open to ingest refrigerant - correct? To get readings both Low and High side manifold gauges are closed - correct? If so, my pressure readings are always end up equal (80 psi) on both gauges and I cannot get the compressor to draw in any more refrigerant than the 16 ounces that it has taken in. Compressor clutch is engaged.
Wonder if there is an issue with the orifice tube or expansion valve. Sounds like no flow control.
It could be that and I hope it is not. I have a factory VIR.
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