There are several reasons why this might occur. If your fluid level is low, your engine will not circulate enough antifreeze to fill your heater core ( which usually leads to your engine overheating, but not always if you are just borderline low), if your heater core is plugged (most common) or if you have a sealed system and there is air in the system which prevents your liquidfrom running through the heater core. The most likely cause is a bad heater core which is bad news because it is hard to access, therefor hard to replace.
why does my 2002 chevy cavalier over heat after i change the thermostat and the water pump
thermostat
Check your coolant level.
The fan should turn on whenever the engine temperature reaches a certain point. If the fan does NOT come on, the cooling system is not able to dissipate the excess heat. Yes, it can cause the engine to overheat.
Muffler Heat Sheild
Use a propne torch to heat the edges of thermostat while prying up with screw driver or like tool.
try looking at your resistor pack on the passsenger side lower the blower motor down and there is a heat coil and resistor in there
Exhaust components rust out over time due to weather and the heat from the vehicle. On a 2001 Chevy Cavalier, when the muffler strap rusts, welding a new strap in its place will offer a complete and reliable repair.
I'd check the coolant level first, then the thermostat.
im having the same problem with my 1994 I've replaced the heater core,thermostat,radiator,i checked the coolant, and it's not over heating or nothing and still no heat lol
$52- $208 roughly. depends on if the heater core is bad.
Low coolant? Bad thermostat? Heater core airbound, plugged or restricted? Water pump not circulating coolant?