Engine Size: 1.6
Refrigerant Type: 134
Ambient Temp: 75
Pressure Low: 0
Pressure High: 150
Last year, I replace the acumulator (leaking), expansion valve preventive maint. and the desicant, this year wife tried to use the a/c and no cool air, I put the guages on, when the system in not running low side is 40, when a/c is running low pressure shows negative 20, compressor is engage. I suspect expansion valve, but looking for other problems, like I said I replace the expansion valve when I replace the acumulator.
Bad TXV.. Nothing will cause this to happen unless you have another restriction in the system.
Pressure when not running only 40 suggests the system is nearly empty. After a long period not running, pressure should equalize at the static pressure corresponding to the temperature of the car.
Thanks for the responses, well when I went to recover the refrigerent, there was hardly any, so looking around the engine bay I could not spot any leaks, dye or oil around the connections, so I went ahead and pulled the accumulator, Honda civics are real easy, no pulling the dash, pulled it out and sure enough a leak around one of the expansion valve joints, took it apart put new o rings and some nylog, pulled a vacuum, and now she is good to go.
MK378 you were spot on.
in a way I was glad that there was a leak around the expantion valve, it justified me taking the evap out
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