HI,
sounds like a the heater/ blower fan relay went bad. Unless you're mechanically-inclined you'll need a mechanic to install the replacement.
Do a Google search for the relay or blower motor and/or search for a Chevy Cavalier (same car) forum to find a fix - if you want to tackle it yourself.
GL,
TD
What about: Engine Compartment Fuse Block on the Owner's Guide show's two fuses listed: BLO (Heater and A/C Blower) and HEATER BLOWER (Heater and A/C Blower)?
Good Idea! Check those first.
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SOURCE: my 1998 pontiac sunfire is getting hot but not overheating
the fan may be bad but you can find the hot side of the plug and run a hot to the battery and see if the fan comes on. if it doesent you know you have a bad fan if it does you can run a wire to the fuse panel so that it comes on when the car does and shuts off when you shut the car off
SOURCE: heater in 2002 sunfire won't work on low settings
U need treplace the fan motor speed control resistor.
SOURCE: fan does not work on the first 3 speeds but does
It sound's like you might have a bad blower motor resistor.
SOURCE: 2002 Pontiac Montana, No Heat, I put the temp control on
the cabel from the heat dial to the heater box behind the dash could be snaped or jamed thus not opperating the lever which operates the flap which open and closes the heat box next to the matrix. or if your coolant is brown in colour it could be your matrix is clogged with sedament and needs flushing out. or it could be your water pump not pumping coolant round your engine or it could be a knackerd thermostat i hope these will help you id start with the easyest first thermostat
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