A/c not working on my 2007 Saturn Ion. I did a hard reset by disconnecting the battery and the a/c will work for 1/2 hour or so then quit again. Was told that there's plenty of refrigerant and even replaced the relay. Any ideas on what the problem could be? Thanks in advance.

 

When you say it works, is it blowing cold air?
When you say it stops working, is it blowing warm air with the compressor still engaged or does the compressor clutch kick out and the compressor is no longer running?

 

Yes, when working it blows cold air. Then after about 1/2 hour it blows warm air and the compressor isn't engaged. If I do the "hard" reset, it'll start working again.

 

I'd start by checking the connector from the wiring harness to the compressor. I don't know much about a/c, but at least I'd do that. I'd try unplugging and plugging it back in several times just in case there's a little light corrosion on it. Doing that will help to sweep the connection clean. Even better if you have a can of CRC Electrical Contact Cleaner. If that didn't work, I'd check the low pressure switch. I have no idea where it is on your vehicle, so don't ask. Someone else here MIGHT know.

 

Those pressure switches are usually combination low pressure and high overpressure switches built into one. I suppose it is possible your system is building too much pressure and kicking the high pressure switch which opens the circuit.

Or the switch itself may be defective. That is actually more likely. Really need a set of AC gauges to watch the high and low pressures for the 20 minutes it's working idling in your driveway, then see what the pressure does is the function of time. I suppose the clutch could also be defective but now I'm guessing, so please don't go out and buy all these parts simply because I guessed. Troubleshoot it properly. Did you say you replaced the AC clutch relay?

Don't forget that the command to turn the AC on and keep it on comes from the BCM on your car. It's not a straight command from the HVAC head unit to the relay, so there may be other factors involved causing it to kick out

 

Did you ever figure out what the issue was?????

 

He never did put a gauge set on it while I was running so we don't know what the pressures were. Theoretically there could have been a restriction and it was tripping the high pressure cut out switch, making the AC clutch kick out. Still could have been marginal refrigerant level or something else. The world may never know

 

AC system in my 03 has never been touched, and still works last I checked 😂

 

Guys, the OP hasn't responded in nearly 3 years. Let this one go.

 

Rube, 3 year old incomplete thread. I'm gonna let up on this one.