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Heater Cores and Blower Fans
Oldsmobile Alero

What is the problem when the blower fans only work some of the time on a 1999 Alero?


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Wiki User
2005-12-05 18:13:04
2005-12-05 18:13:04

Just had the same problem. First my blower motor would onlywork on "high", and then it started to change speeds and shut off by itself. Replace the resistor mounted in front of the blower motor.It costs about 40.00 at a dealer.

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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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Not to assume anything...There are two primary fans on the typical vehicle: engine / radiator cooling fans and the heater blower fan.Both are covered in the "Related Questions" below.

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You probably have malfunctioning blower fans. A blown fuse can cause your blower fans to malfunction. The heat and air conditioning cooling is not being forced into the passenger cabin.


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