Originally Posted by andrewwynn

I haven't measured my system when not running but I'm pretty sure the equalized pressure is a lot higher than 37. Did you have cold air after the refill and have you tried at not idle?

I've seen when the car was idle not making cold but when driving it will. I attribute to a problem with the variable compressor.

If there is no difference in high and low side means compressor is doing nothing. If the clutch engages means there is enough pressure for the low pressure interlock to allow it to kick on.

Were this my car id be pulling off the clutch mechanism for a rebuild but don't think there is enough room to work under the car might have to take out the whole compressor.

If the problem was not compressor related you will get substantial pressure difference.

The cans have about 50 psi full and maybe 30 psi empty. You can't get freon out of the can unless the compressor pulls a vacuum on the low side and drops the pressure.