On my 2006 aveo you can run the ac for 30 mins then it gets hot i think it is the temp switch,or could it be something else

SOURCE: I have a 1998 3500 chevy truck my AC runs about 30

There is a relay fuse under the hood. It should be in a fuse box but sometimes they are connected to the firewall or the above the wheel well. New ones are usually fairly cheap.

SOURCE: my 2006 impala reads engine hot ac off and the

You need a new temp censor for your vehicle

SOURCE: Temp doesn't seem to be warming up, heat not blowing hot.

It sounds like the thermostat is stuck open and you will have to replace it.

SOURCE: runs fine til the temp out gets hot enough then dies

you didn't say if it was hot on the temp gauge? no matter, it sounds like you have a stuck t-stat. when the engine is cold, a mechanical valve keeps the water from coming out of the engine block until warmed up, then opens and lts the cooler water in. this cools down the engine and the colder temp of the water shuts the valve again. this happens constantly while the engine runs, and if your t-stat is stuck, the engine heats up the water in the block, but with nowhere to go, simply overheats the motor. a good repair book will locate the thermostat housing for you and should you the repair procedure. (i assume you have checked the water in the rad. low water will give you same symptoms). good luck.

SOURCE: 2006 chevy silverado 2500hd truck heats up to

If I understand you correctly, your temp gauge shows correct operating temperature, your blower fan blows air that you can feel with your hand from the right floor or dash outlet, but that air doesn't feel warm until you are moving?

If so, several possibilities come to mind. One is that your coolant level is low. Even though your temp gauge reads in the right range, the coolant level could be low enough that it doesn't reach the heater core until there is enough engine RPM to create more pressure from the water pump and force what coolant is there toward the heater core. Another possibility is that your heater controls are not able to do their job. A stuck flapper in the duct or a malfunction with the temperature control system could be causing the problem, and at 15-20 MPH there is enough air coming through the outside air vents to provide some heat.

I'd check the coolant level first, though. The other possibilities are more far-fetched.