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George H.
George H., ASE Certified Technician
Category: Buick
Satisfied Customers: 18665
Experience:  ASE Master 15+years
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Blower motor won't stop running when you cut the car off,

Customer Question

Blower motor won't stop running when you cut the car off
JA: How many miles are on the car? Is it an automatic or a manual transmission?
Customer: 84,000 atomatic
JA: What is the model of your '84 Buick?
Customer: 1991 Buick Park Ave.
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes tried pulling out relays under hood it stayed on
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 1 month ago.
Category: Buick
Expert:  George H. replied 1 month ago.

Hello I will help,

Do you have an automatic blower system where you just set the temperature?

Customer: replied 1 month ago.
Expert:  George H. replied 1 month ago.

Ok, the blower motor speed control transistor has failed, if you can find one replacing it will restore the system to normal operation.

Let me get you locations and see if I can find a source for the transistor.

Customer: replied 1 month ago.
Charlotte North Carolina
Expert:  George H. replied 1 month ago.

I believe this will be what you need, compare it to the module you find in the top of the box to the right (passenger side) of the blower motor. The part is expensive, for a few years it was not available at all. It is the 4P1403 Airtex part.

You will need to remove the fuse rack to get to the module that needs to be replaced.

Let me know what I can do to help


Expert:  George H. replied 1 month ago.

Are you still with me??