Contour Enthusiasts Group Archives Forums General Troubleshooting A/C LOW pressure is too high

working on an escort 1.9 liter A/C system. The pressure on the low side is way too high. 75psi Would this indicate a messed up orifice/valve?

I'm not sure but would like to find out the answer too. I have similar symptoms on my explorer.

just sell the car, my brother had one. they're too slow to fix the a/c. just sell it.

Gee!

Which freon? What's the high side doing? Does low side not change at all? Is the compressor even turning? What year and miles? Lines freeze up?

So many systems, so little time.

Mt experience is:

If the low side is high, and the high side is low, the compressor may be shot. Or if there is an equalization solenoid, it may be leaking.

If the low side is high, and the high side is high, there is too much freon in the system.

If the expansion valve is broke, plugged, or frozen - the low side usually goes too low. This freezes the line up just after the valve.

A static pressure reading of 75 psi (on both the low and high side) while the clutch is not engaged is not abnormal (depending on under-hood temperature).

If the low side pressure remains at 75 psi when the clutch engages and does not drop, the compressor internals are either a) shot or b) not turning due to a failed clutch (it only looks like the compressor is being turned. Use an inspection mirror to closely watch the center nut/bolt to see if the compressor shaft is actually turning.

Steve