Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello I will help you with your question,
There is a relay on the resistor board that turns on the high speed from a dedicated fuse. I believe that resistor board mounted next to the blower motor needs replacing. The connector to it may need to be replaced as well.
if you have a voltmeter or a 12 volt testlight I can help you check to see.
Let me know how I can help
Great, switch the key on and with the blower switch in any position except high or off check at the resistor connector under the right side of the dash next to the motor in the bottom of the blower case.
There should always be power on the larger red or orange wire, there should only show one wire other than the larger red or orange wire with 12 volts at a time when you turn the switch.
If you get that and you see no burning or melting of the connector replace the resistor. if you see burning replace both the resistor and the connector pigtail.
Let me know what you find
That is fine, we work at your pace.
Respond to the email and find this question string, make a post here and I am notified.
Let me know what happens.
I am always glad to help, I will watch for your post when you get a chance to check it out