This could be due to a couple of things. The temperature switch is bad, the AC selector switch is bad, the AC compressor is not engaging when you turn the air on, or the AC system needs to be recharged. FriPilot
Thermostat and/or heater core may be defective
No, not if it's on a heat setting. Most home thermostats have a "Fan" setting that will blow cold air if the attic is cold.
Could be a number of reasons for this condition. I would check the coolant level. A low coolant level could cause your heater to blow cold air when the engine is warm. Is the engine warm? If the engine is fluctuating temp it could be a faulty thermostat. Hope this helps.
Most of the Sunfire vehicles do not have a plug in for the cold. If a 2002 Sunfire had an aftermarket block heater installed, the cord for it would be located in the front bumper.
Cause its broke!
THE CAUSE for this is that when your cold air is on the petrol is used to create air. and that is how cars create cold air
heater core could be rusty and old or line to heater core could be plogged most likely old heater core
could have too much freon in it -air could be going thru heater coil- no air flow thru condensor
the blown head gasket would make it over heat. but it wouldn't cause the heater to blow cold, it should actually blow hot if that is wat happened
freon needs to be charged
This means your Jimmy is pregnant with a Jenny.
Could be low on coolant.