I have a 2002 Pontiac Grand Prix. It has not had any heat or A/C for the past year. I have replaced the following in this order:
*Checked and replaced all fuses related to HVAC system (checked each before and after with test light)
*Replaced ignition switch (tested with multimeter, has continuity)
*Replaced control unit (head unit) (tested with multimeter, has continuity)
*Replaced blower (jumped with battery, works)
*Replaced resistor (tested with multimeter, has continuity)
After replacing these parts, I still have no heat or A/C. I have gone through with a test light and tested all power and connections. Everything is good until I get to the connector that attaches to the resistor. There is an orange wire to the far left of the connector that when I touch it with the test light, it has power. I check all the other wires in the connector, I get nothing. Even when I change the fan speeds on the head unit and use the test light on the connector, I get nothing. Just power to the orange wire on the far left side of the resistor connector. I have also jumped the blower motor and it works just fine, no problems. Even used a multimeter (or a volt tester) to make sure everything gets power and everything tests fine. Just get absolutely no power to any fan speeds on the resistor connector. The connector has 7 female slots (I hope I explained that correctly) and the car has dual climate control. I know the head unit has power, it turns the actuator door when you change where the air is blowing (floor, windows, etc) and when you switch from heat to a/c you can hear the door turn. The rear defrost works as well, which is the only thing that works as far as any defrost or heat is concerned. My mechanic has checked the thermostat as well as flushed my coolant system so there are no leaks and it doesn't and has not ever overheated since I have had it.
I have searched and searched for diagrams or how-tos on how to replace the wiring harness for the resistor or even how to replace the connector and have come up with nothing. I am hoping for some insight as to what I could do next. My next step is to test each wire coming out of the wiring harness without the connector attached to see if it is a faulty connector. But I wanted to make sure first before taking that step.
If you need any other information please let me know.
have the same problem?
Sunday, November 8th, 2015 AT 7:29 PM