Overheating/no heat It has been below freezing lately and on 2 occasions my temperature gauge has redlined. The first time it acually dropped to the normal level after coasting for a moment, and the second it continued until i pulled over and stopped the car. Also, and i feel as though this is related, even when the temperature gauge was redlined, my car was not pushing any heat through the vents. Until recently the car has put out heat ok.

SOURCE: 99 cavalier temperature gauge won't work

Sounds like your cluster died, try getting one from a salvage yard.

SOURCE: slightly overheating while at idle and heater on low or off.

The thermostat is starting to stick .
Replace the thermostat.

SOURCE: antifreeze ts boiling back into reservoir.

it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it

Testimonial: "I bet you've hit on the problem ! Car has been "using " antifreeze for a couple years now, with no leaking anywhere. Lost through the head gasket ?"

SOURCE: 2001 chevy monte carlo is overheating when driving

Hi;
If your engine cools down when moving fast, you either have a problem with your water pump or your electric fans that cool off your radiator and a/c condenser. This is controlled by a temperature switch, but these fans should kick on instantly when A/C is selected.

SOURCE: 97 cavalier,coolant light is on

Resat ecu by diconnect battry cupple of hours......