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Heater blower motor working sporadically - 2004 Chevrolet Impala

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Heat blowing on passenger
cold air blowing on drivers side

Posted on Nov 16, 2009

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2004 crown vic. only 63K miles on her. AC/heat fan was sporadically working, now its done. AC was nice and cold, working fine. Is the fan a hard replacement if I were to find one at a parts yard?


Try to check the power and ground on the blower fan. If you missing the ground on the blower fan connector than most likely it is the blower fan resistor (controller), it is located under the hood close to back firewall behind left cylinder head.

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What would cause the interior blower motor to cut off & on sporadically, even with A/C turned off?


possible bad connection at motor or bad ground but if it has fully electric controls you might need a scanner to find out the codes oh sorry just checked its a 92 so i would go for connections at the motor first or try a good known motor it could have a bad armeteur inside

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Sounds like a bad blower motor. these can be purchased from your local auto parts stores.

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The stalling is most likely caused by the Idle Air Control solenoid (IAC) and/or a dirty throttle body . This can also cause erratic acceleration if your throttle is sticking.

The problem with your blower motor is most likely caused by the blower motor resistor. All of the speeds except HIGH are routed through it. It is also possible (but not real likely) that your blower control switch could be bad.

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Problem for Chevrolet 2004 Impala Heater blower motor working sporadically


I HAD THE SAME PROBLEM WITH MY IMPALA. THIS SOUNDS CRAZY BUT JUST WHACK THE PLASTIC UNDER THE GLOVE BOX A GOOD ONE. I FOUND THAT SOLUTION ON THE INTERNET.
MY BLOWER QUIT WHEN MY WIFE WAS DRIVING THE CAR. SHE STOPPED, WHACKED THE PLASTIC UNDERNEATH THE GLOVE BOX, AND IT HAS BEEN WORKING EVER SINCE. SHE FIXED OUR CAR!!!!!!!!!!

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Check the fuse and then the switch it self, if the fuse and switch is good. Then check the blower resistor and blower motor it self. I'm leaning towards the switch it self since you mentioned that it was sporadically and on the highest setting would by pass the blower resistors. Good luck and if it's not the switch then it's going to be the blower motor it self. Auto Zone has them in stock and can give you the step by step instructions for you to get the job done with common tools.

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Most likley your blower motor has a "dead" spot in it when you hit a bump it jars it to work. Replace the blower motor.

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Jeep Wrangler Heater Fan


First, check for power (12v) at the fan plug. If you have power, the fan motor is shot. (replace it).You can "hotwire"the blower right to the battery to verify motor failure... don't forget the motor housing needs to be properly grounded or power is useless!!
If no power, check the blower motor resistors (located on the firewall side of the heater box... usually looks like an oval flat plate with three or four wires connected to it. When removed, you will see two or three small coils: they should not be broken. Upstream from that you may need to look at the blower relay. Generally by the time you get to that, you have already solved the problem. If not, get a good wiring diagram before going further!

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