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air conditioning working but blower will not come on.
Car: GMC, Yukon, 2004, 5.3 - Back to Fix-It
Q.air conditioning working but blower will not come on.
GMC Yukon with SLT Package. 5.3 Liter Engine with Dual Controls for Temperature for the Front Passengers. With separate AC in the back for the other occupants.
Addition If you are driving you can feel the air that is cold coming from the vent. But if you are stopped without the air being forced into the AC Unit you feel nothing. The Fan Blower will not come on for the front but will blow in the back of the cab.
Answer It may have a melted connector at the blower resistor, this is common. Remove the hush panel under the passengers side of the dash. Under there is the blower motor, follow the wires from the blower motor to the resistor, its about 6inchs away.
There is a connector at the resistor that has about 5 wires going to it, remove this connector and inspect the wires and the connector. If no problem is found, remove the resistor and look for a burnt spot on the resistor, you will know if it has a burnt spot by looking at it.
Addition Checked wire connections and no excessive heat was found. Good tight connections. I removed what I thought was the resistor. It comes from the motor with info on the tag saying it is a carter group part with a part #9643 or(1P) 52409643. If it is the resistor I found nothing indicating a burnt spot on it.
Answer The resistor will have 2 screws holding it in, have a 5 wire connector going to it and a 2 wire lead going to the blower comming out.
Forgot to ask, manual a/c or auto a/c. Auto (has a digtal dispaly) does not have a resistor but a module with less wires.
Addition It has auto a/c. Two wires going to motor with 3 wires coming into the module. Wiring drawing on back of module has A going to Batt. B to imput. C to Ground. If module could be the problem can it be checked or would there be another consideration for repairing the problem?
Answer The module is 99% likely the problem.
You can check for power at the red wire and gound at the black wire. The red wire should have power all the time. You can also check power at the purple and black wire going to the blower motor for power and ground.
If you have power at the red and ground at the black, no power at the purple wire, the blower motor module is bad.
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