Thread: A/C not engaging

Last year when I bought my 2004 GTP with 139k on it, the a/c blew ice cold. During this winter, I had a local shop replace the flexplate. Now that it's getting warmer out, I go out to turn on the a/c and nothing happens. Not even a click. I've checked all the fuses and relays and everything seems fine. Is it possible something was disconnected when they replaced the flexplate? Or is there something else wrong I can look for?

Thanks

Does it blow anything?

The fan works if that's what you mean. But the clutch on the compressor does not engage or even attempt to it seems

You are low on R134, there is a pressure switch that will not allow the AC clutch to kick in unless there is enough pressure. Use, rent, steal, buy or otherwise use a set of gauges and check the pressure. your resting pressure should be around 80psi. If it is lower than I thing 40 it will not work. If it is low add a can, or partial can until you get the proper pressures (40 low side and 240 high side at about 75-80*). Most of the time I find that the schrader valve is what is leaking and it will leak a small amount and over the winter you end up finding out it's below the point where the AC will work.

Jeff

EDIT: If you are using a set of gauges where you actually screw the valve in to open the schrader valve just go to the point where it starts to show up on the gauge, if you screw it in too far it will cause the schrader valve to leak more.