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It's the middle December in Ohio, and of course my heater fan/blower stops working. Here are some things I've tried. I am guessing it could be the heater control switch unit itself, but I wanted to see if anyone else had another theory or another possible test. Here's what happened:
I plugged a new resistor module in. No dice. I plugged a new fan in. No dice. So it's not the resistor, and it's not the fan. (Both have been replaced already anyhow a couple years back)
Then, I ran a multimeter on the blower plug itself (purple wire going into the fan), and the main red hot wire ("C" in the connector) going into the resister/blower harness. Very weak voltage.
I checked the relay fuse under the dash. It's fine. I jiggled the connector to the resistor, oddly enough, shorthly thereafter, I suddenly I'm see 12 volts in the hot wire ("C" on the harness). It could have been a coincidence, but at that point I suspected it was the connector hardness/pigtail going into the resister/blower. I got a new resistor connector (5 terminal plug, not 7 terminal most parts stores only have the 7 terminal, I had to go to the dealer for the 5 terminal).
I spliced in a new connector. Still no blower.
I ran the multimeter on the "C" hot wire again. Weak voltage (.04 on the multimeter). I yanked the dashboard plastic. I unscrewed/unplugged/plugged the heater control / climate control knob assembly. It's working again. Do you guys think it could be the knob/heater/climate control module? The temp setting lights burned out in mine recently, so I'm wondering if it's having a meltdown inside. I opened it up and it looked like a bunch of circuit boards, so I didn't mess with it. Hopefully, this is the problem, but again, just seeing what you guys think. Going nuts here, and I'm not sure what else it could be. Thanks!
I plugged a new resistor module in. No dice. I plugged a new fan in. No dice. So it's not the resistor, and it's not the fan. (Both have been replaced already anyhow a couple years back)
Then, I ran a multimeter on the blower plug itself (purple wire going into the fan), and the main red hot wire ("C" in the connector) going into the resister/blower harness. Very weak voltage.
I checked the relay fuse under the dash. It's fine. I jiggled the connector to the resistor, oddly enough, shorthly thereafter, I suddenly I'm see 12 volts in the hot wire ("C" on the harness). It could have been a coincidence, but at that point I suspected it was the connector hardness/pigtail going into the resister/blower. I got a new resistor connector (5 terminal plug, not 7 terminal most parts stores only have the 7 terminal, I had to go to the dealer for the 5 terminal).
I spliced in a new connector. Still no blower.
I ran the multimeter on the "C" hot wire again. Weak voltage (.04 on the multimeter). I yanked the dashboard plastic. I unscrewed/unplugged/plugged the heater control / climate control knob assembly. It's working again. Do you guys think it could be the knob/heater/climate control module? The temp setting lights burned out in mine recently, so I'm wondering if it's having a meltdown inside. I opened it up and it looked like a bunch of circuit boards, so I didn't mess with it. Hopefully, this is the problem, but again, just seeing what you guys think. Going nuts here, and I'm not sure what else it could be. Thanks!