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George H.
George H., ASE Certified Technician
Category: Pontiac
Satisfied Customers: 18628
Experience:  ASE Master Tech 15+ years
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High blower setting does not work on my 86 firebird, 1986,

Customer Question

high blower setting does not work on my 86 firebird
JA: What year is your Firebird?
Customer: 1986
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: replaced fan switch and blower motor
JA: How many miles are on the car? Is it an automatic or a manual transmission?
Customer: 127000/auto
JA: Anything else you think the mechanic should know?
Customer: blower motor works on lo/med lo/med/just not on high
Submitted: 10 months ago.
Category: Pontiac
Expert:  George H. replied 10 months ago.

Hello I will help,

Do you have a voltmeter to check the circuit if I guide you?

Customer: replied 10 months ago.
no
Customer: replied 10 months ago.
are you in the process of responding?
Expert:  George H. replied 10 months ago.

Sorry I was not at my computer when you responded,

Can you get a voltmeter so I can help you?

Customer: replied 10 months ago.
I probably could.if I got one walk me through the process of what I would ckeck for. and I was also wondering if this could be resistor issue. the resistor looks ok but could it still be defective?
Expert:  George H. replied 10 months ago.

Anything from a burnt connection to the resistor to a failed connection could be the problem. We start at the motor checking for 12 volts at the purple wire with the key on and the switch on high. What you find there will drive the direction we check next.

Which enigne do you have in the vehicle?

Expert:  George H. replied 10 months ago.

There is a fuse link that provides power to the high speed relay, that would be the next check at the relay to be sure it has the 12 volt supply at the orange and red wires with the key on and the switch on high.

Customer: replied 10 months ago.
tpi 305 its in a transm
Expert:  George H. replied 10 months ago.

Ok, let me know when you have a meter, I am here most of the time so just post on this thread.

Thanks

Customer: replied 10 months ago.
where is the fuse link located?
Expert:  George H. replied 10 months ago.

It is down near the starter. Attached to the positive cable from the battery.

Customer: replied 10 months ago.
I had asked you earlier if the resistor could be the problem. I'm having it checked tomorrow. the blower motor is obviously receiving power as the lower settings are still working! very puzzled. could there be a relay somewhere that is burnt? thankyou!!!
Expert:  George H. replied 10 months ago.

Yes it could be the high speed relay as I posted above, there are also connections and a fuse link. You said you would get a voltmeter so this can be tested. Have you done that so we can get started?

Customer: replied 10 months ago.
Where is the high speed relay located?
Expert:  George H. replied 10 months ago.

Do you have a voltmeter? It will get expensive if you just try replacing parts.

That said the relay is to the passenger side of the of the AC accumulator.

You may have a fuse link that needs to be replaced or a poor connection, you have to test to be sure of the problem.