rv2 Ac not working. equal pressure readings?

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barnyardbarney

barnyardbarney

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After changing 2 compressors we still are getting equal pressure readings 100 PSI on both sides. Bad reed valves in compressor or expansion valve? We also changed drier and expansion valve. We made sure of putting in gas, not liquid freon. Any ideas would be appreciated.
 
I don't know how a bad TXV could be THAT bad "but maybe" I would think even one "wide open" should generate some differential. Are you sure the clutch is actually engaging and the compressor actually turning?

YOU DO HAVE both valves shut on your service manifold?

As usual, WTF are you working on?
 
take a pair of vise grips and block off one of the heater hoses then retry it could have heated air entering the evaporator core this will raise the low side pressure, also is the low side line at compressor cold?
 
^^Good idea^^ With those pressures, tho, unlikely suction will be cold LOL
 
Hi,

X2 on are you sure both side wheel valves are closed on the gauge set? I can't believe you're on your third compressor and it's a compressor issue. Also, exactly how do you have the gauge set connected?

The Factory Service Manual outlines how to test the expansion valve. You really need a FSM when working on these systems.
 
Sorry man, I find it hard to believe 3 compressors in a row "had the same problem"
 
The expansion valve has something restricting it. Period.
 
Restricted valve, Rob, would give different results. That would be very low suction, and fairly low head, with no heating on compression side or cooling on suction side. Same thing as "pumping down" a system. Ya know it's too damn bad that Ma didn't put real service valves on these like Ferd did. It makes troubleshooting much easier, sometimes.
 
I agree that he probably had both valves open on the gage set. I made that mistake recently and was thinking WTF when I read 100 psi on both gages. Then, I remembered that those valves connect each side to the center port. With both open, you bypass the compressor.
 
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