Four possible issues. Start by checking fuses. If you are lucky, someone put the wrong amp fuse in and replacing it will fix things. Bad switch. More likely, bad fan motor or bad blower resistor. You can check the resistor by unplugging the wire connector and remove the part (two screws hold it into the plastic heater cover under the hood on passenger side of firewall) and inspect it for a broken wire. This will look like a small spring or two, and if one is broken, replace part. You can test the fan motor by unplugging the single wire going to the motor, use a jumper wire to BRIEFLY connect straight to the battery and see if it runs or just makes a big spark. Big spark = replace the motor.
SOURCE: heater blowing cold air Buick Century 2000
does the car not heat up in general? Whats the temp gauge doing and how long of a ride have you tried this for?
SOURCE: heater wont blow warm/hot air
check your radiator coolant, thats what I did and it blows warm again
SOURCE: A/C/Heater only work and High and Heater does not blow hot air.
you can change the thermostat yourself for under 20 dollars. if you dont know how go to an autozone and they will assist you.
SOURCE: heater is blowing but its cold air not hot air 2000 expedition
Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.
SOURCE: 2000 Chevy Silverado 1500 The heater does not
Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..
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