We have a 1999 Olds Intrigue...and the heater/ac fan will only come on in high speed...it used to work on all speeds...where do we start to
troubleshoot this problem?
In most cases this is a symptom of a blower motor “resistor” failure!
The job to change the blower resistor is not hard to do. Just cruise your local salvage yard for a good used one.
Install it and see what happens!
This only applies to cars that DO NOT have “Automatic Temperature Control.”
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