By November 19, 2012 2 Comments Read More →

A/C Blower Motor High Speed Only

a/c blower resisterThe heater fan in my car runs only in high speed even with the ignition shut off. I pulled the 30 amp A/C fuse under the hood to shut it off. Is there a relay and if so where is it located? The auto parts store shows 2 different relays for the heater fan.

Thanks!

Howdy

You probably have a bad A/C blower module , which I believe is outside under the hood in the middle of the firewall on your car , or at least it is on a Cadillac which is similar.

This might be a dealer item only, you might want to visit your local dealer part department and talk to them about it, they will make a print out of the location if you buy the part from them.

I think its pretty expensive, so make sure that is the problem before you just buy it and not be able to return it.

Good video about how to check for a bad blower resister yourself

Blessings,
Austin Davis

Posted in: A/C and Heater

About the Author:

Austin Davis, consumer car repair advocate. "Hi there! I love to help people solve their car repair problems and I hope my site was helpful to you today. Thank you for stopping by."
  • anthony iezzi

    another common problem for the buick ( with only a high speed blower) is the ignition switch.

  • shorns

    12/10/2006
    Well I have a 1996 Cad Eldorado. Blower motor runs by itself and various times (day and night.)
    Replaced the BLOWER MODULE-Did not stop the blower motor from kicking on at different hours!
    Then replaced the special RELAY – Thought that would stop it – IT DIDN’T!!!
    DOES ANYONE KNOW WHY THE AIR & HEAT BLOWER MOTOR KEEPS KICKING ON BY ITSELF??? PUTTING A NEW BLOWER MOTOR AND RELAY IN THE CAR DID NO GOOD! THERE’S GOT TO BE SOME REASON THE BLOWER MOTOR KICKS ON BY ITSELF AT ALL HOURS!!!
    A SOLUTION APPRECIATED.
    Thanks / shorns