Chevy Lumina
Heater Cores and Blower Fans
Windshields and Wipers
Dodge Durango

Why would the heat blower motor only work when the car is in reverse on a 1991 Lumina?

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2006-02-17 18:23:51
2006-02-17 18:23:51

Wow...that's a new one. About the only thing that could cause this I'd think is some sort of short that when the backup lights come on (only when you're in reverse) or when the shifter itself is in this position, this somehow causes or fixes some sort of a short. You don't mention whether this is a column shift or console shift car, but I'll bet it's a column shifter? Assuming it's a column shifter, I'd probably be trying to get into the dash behind the speedometer and see if there's some wire that got rubbed raw from the sliding up and down action of the column shifter. If it's a console shifter, I really am not sure what it could be, but I'd get inside that console and see if there's something wrong with the wires.

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Blown fuse? Bad blower motor? Bad blower motor resistor? Bad blower motor switch?

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Could be, a blown fuse, a bad blower motor, a burned out blower motor speed resistor, a bad blower motor switch,

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Defective blower motor or blower motor resistor pack.

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No, that would have no bearing on the blower motor. Check the fuse, blower motor resistro pack, and the blower motor itself.

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I would suspect the blower motor speed resistor is bad.

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I would suspect the blower motor speed resister is shot.

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If you are referring to the blower motor squealing, then I would suspect the blower motor bearings have failed.

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If you have checked the blower motor and it does function when power is applied then I would suspect the Blower Motor Resistor Pack is defective. It is also possible the blower motor speed control is bad, but highly unlikely.

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If the blower motor randomly and intermittenly quits and does not work, chances are good the blower motor itself is faulty, if the blower motor does not work on all fan speeds from low through high, it most likely needs a blower motor resistor.

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The blower motors only work with the engine running. If the blower motor has three wires on the electrical plug, then the blower motor module is built into the unit & it's very expensive. Sometimes, you can tap on the motor with a hammer & it may work or slowly turn. If this is the case, replace the blower motor.

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If you only have high speed I would blame the blower speed resister. If you have no speeds and the fuse is good, I would blame the blower motor or the switch.

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Is it the blower motor or is it the fans in the front?if its the fans they will come on at anytime to help cool engine down better.If its the blower motor for the interior heat and air you got a electrical problem. Is it the blower motor or is it the fans in the front?if its the fans they will come on at anytime to help cool engine down better.If its the blower motor for the interior heat and air you got a electrical problem. If it is the blower motor for your heater then it is definatly you blower resistor

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The blower motor is going bad and drawing too much current.The blower motor is going bad and drawing too much current.

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The year, make and model info would help but in most cases the blower motor resistor can be found close to the heat blower motor. So locate the blower motor and the resistor should be very close to it.

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Check at the blower motor itself. Have it turned on and tap the end of the blower motor with a hammer. I did this and found out that the blower motor was going out. The blower motor is on the top passenger side under the hood. Also check the wire connections. Make sure they are seated good. If this includes for the heater then I would say the blower motor is bad.

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I have a 2002 Chevy Impala and I had the same question. Mine is under the passenger side glove box in back of the blower motor up against the firewall. Mine is very hard to get at, I am thinking of taking the blower motor off so I can get at it better. Anyway, I would guess it would be right by the blower motor...:)

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Blown fuse, defective blower motor, or defective blower motor resistor pack.

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The blower motor speed resistor is burned out. The resistor is located close to the blower motor and is easy to change. Your local auto parts store will have that part for you.

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It might be your resistor, does it work on 4 but not on 1,2,3? If so, you need a new blower motor resistor.

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Well it is apparent that all is not ok. The speed of the blower motor is controlled by the blower motor speed control switch and the blower motor resistor pack. One of those two items is your problem. I would bet the blower motor resistor pack is defective. The only way to know for sure is to replace it.

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The blower motor itself could be seized or the wire connection to the motor may be loose. The blower motor is located on the passenger side under the the dash. You will have to remove the cover just above the passengers feet to locate the blower motor. Hope this helps.

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Could be, heater blower motor has failed. blower motor fuse is burned out. blower motor speed resistor is burned out. blower motor switch is bad. or, if the blower motor works but you have no heat it could be, cooling system is low on coolant. thermostat is stuck open. heater core is plugged. temp blend door actuator is faulty.


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