Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Okay well lets start testing.The first thing I would like to have you do is test to verify that the fuse in the underhood relay box is good.If the fuse is indeed good, I would like you to get to the blower motor. You'll find the blower motor under a trim panel above the passenger seat.Disconnect the two wire connector and connector multimeter to both wires.With the key in the on position, check to see if the blower motor has 12 V. If the motor has volts being supplied to it, the motor is at fault.If the motor does not have 12 V. We will need to gain access to the heater control resistor.To get access to the resistor if memory serves you will need to pull the glove box. The resistor sits on top of the heater box.You will find that the blower motor resistor has four wires plugged into it. The wire colors are dark blue, light blue, tan, and yellow.With the resistor unplugged, key in the on position, turn your blower fan switch onto speed one. Check for power on the yellow wire at the resistor.If you have power at the yellow wire at the resistor, the fan speed switch is sending signal and we will assume it's good and can at least make the fan run on one speed.You will find next to the resistor a blower control relay.With the key in the on position, blower speed set to the first speed I would like you to test for power on the dark blue wire going into the relay.
If you have power on the dark blue wire I would like you to test for power coming out of the relay on the purple wire.If you find that you have power going into the relay on the dark blue wire but no power coming out on the purple wire, the relay is failed.
Please let me know what you're testing reveals, and I will get back to you as quickly as possible with further answers.I am at work from 7 AM to 5 PM but do carry a Blackberry so will getyour response as soon as you send it and get back to you as quickly as possible.Thanks, Josh
Well I'm glad to hear it was such a simple fix.It's nice when it works out that way..
have a great week. Thanks, Josh