GM Repair Problems? Ask GM Repair Expert Now.
Does the blower motor blow on all the other settings?
Do you have a digital volt meter and a test light so we cn do some testing?
With the ignition switch in the run position, and the blower motor switch set to high, use your meter to see if you have 12 volts on the orange wire for the blower motor relay under the hood next to the blower motor resister.
With the relay plugged up see if you have 12 volts on the purple wire at the relay please.
Did you use your meter to test for power on the wires I ask you to test?
Did you test them with your meter? How many volts did you have on each wire?
So both wires had 10 volts?
Now set the blower switch on low and see how many volts you have to the blue wire at the relay please.
I need you to do each test as I tell you so I know what to have you test next to be able to find your problem. I will be online for the next 6 hours if you want to get back on this with me.
I gave you things to test, but you will not test them. I can not give you any other tests to do till I know what has voltage on it and what does not.