The A/C in our 98 Saturn SL1 works great until the car stops. When I stop, it begins to blow hot air. If it sits too long in one spot, the car will begin to overheat. Any suggestions?

Check for power going to the cooling fans relay. If you have power to the relay but you can't hear the relay click when the A/C is switched on, you may have a problem either with the relay itself, or the Powertrain Control Module (PCM) that controls the relay.

The relay switch is going or gone.

The coolant is low.

Relay is working, coolant level is topped off. I was just out tinkering and found that the temp sensor by the fuse box is what keeps kicking the compressor on and off(the line it's on runs from the radiator to a block on the firewall, then returns to the a/c compressor). The car is still reading below half way on the dash coolant gauge, but it still kicks off the compressor. I thought maybe that sensor was bad, so I bypassed it for a minute and my compressor made a loud hiss and shot oil for a brief second. I'm hoping that I didn't just kill my compressor. Could there be another sensor that's going bad, or could this be a thermostat problem, or is there something else I haven't touched on yet?