I have a 2003 malibu, the heater resistor burnt out. My husband replaced the part and the heater stopped working 1 1/2 days later. He replaced the piece again, the heater worked for about a week and is not running again. Any ideas of what other problems this could be? Cold wisconsin winter, a 3 month old and no heat is not a good situation.
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1-2-3 WHENT WHEN RESISTOR BURNT OUT
4 ON A RELAY COULD ALSO BE BURNT
5 ALSO ON RELAY THAT COULD ALSO BE BURNT
I ASSUMED THAT THE HEATER FUSE IS OK (CHECH PLEASE)
IF ALL OF THIS IS BURNING UP THE BLOWER MOTOR COULD BE FAULTY
OR THE SPEED SWITCH COULD BE THE CAUSE
LOAD TEST THE MOTOR ON IT'S OWN TO SEE IF OVERDRAWS EXIST
IF NOT CHECK OR REPLACE THE SWITCH
THE RESISTOR ARE KNOWN TO GO
BUT USUALLY THE RELAYS ARE GOOD AND STRONG
THE RESISTOR WOULD BE CLOSE TO BLOWER MOTOR
AND MOST RELAYS ON TOP OF AIR DUCK BEHIND GLOVE BOX
its the heater fan resistor thats causing it. it has coils for different fan speeds, if a coil burns out or breaks. then you will loose that fan speed. to replace resistor, remove glove box to give ya more room so you dont have to stand on your head!! remove insulating panel under glove box. loosen and slide ecm to the side. now you can see heater blower fan, resistor is beside it, just remove wires , take out the hold down screws. and thats it!
the resistor is just below glove box. remove panal under glovebox, move pcm to one side to get access to heater fan and resistor. resistor is right beside fan motor, disconnect connection to resistor, remove screws holding it in. pull straight out to remove.
Good call emissionwiz. It's right behind the blower motor, under the glove box area. Remove the shroud below the glove box, 2 screws and a snap-pop fitting. Be careful of the courtesy light. Remove the blower moter and disconnect the purple/black power connector to it - - you'll need this extra room to work with. 2 more screws, same size, 6.5mm on mine, 7or 8mm on some others, that holds the blower motor resistor in place. This replacement part is less than 40 bones at most parts store. Unplug, replace, re-install, test and you're on your way with about 2 hours of slow paced effort in your own driveway. Typical cost at a garage - up to $400, what a sham.