Either the linkage from the temp control unit to the valve on the heater core (which is behind the radio and temp controls) or it is the heater core itself.
The 2005 Cavalier could have a fuel leak. Have the entire fuel system checked, as a fuel leak can cause a dangerous fire.
If you smell gas in your 1995 Chevy Cavalier when the heater is on, it could indicate a leak in the fuel system that is being drawn into the ventilation system when the heater is running. This could be due to a faulty fuel line or fuel injector. It is important to address this issue immediately as it presents a potential fire hazard and can affect the vehicle's performance.
Thermostate stuck closed or low on anti-freeze or pluged heater core or bad water pump or the the A.C to heat deverter valve (if equipt) not operating correctly
Have your ball joints checked out.
the first thing to check is the manifold air temperature sensor
it could be a few things, but id check the thermostat as its probly stuck open, or your heater core could be bad but that will cause a water leak in your car and its a pain to change. or you can check your heater hoses for sludge.. because 50/50 anti freeze tends to cause that
i was wondering whether the switch at the parking brake could affect this problem.
No, a clogged heater core will not make it overheat. A leaking heater core will.
A broken rod is usually caused by a binding problem. The piston could be stuck or the rings may be damaged.
The 1989 Chevy Cavalier could be either a 2.0L 4-cylinder or a 2.8L V-6.
It could be that you need coolant or it's low.
Yes it could and so could a stuck open thermostat or a plugged heater core or a faulty temperature blend door actuator.