So last night. My heat stopped working randomly. I'd noticed before that I'd start my car in the morning, go back inside and get ready, and then go back out to the car, and the heat wouldn't be blowing out, and it wouldn't start blowing until I turn it off then back on.

Checked the heater motor fuse today, and all other fuses, and everything was good.

Removed the blower motor, and it runs still off a battery.

Tested the voltage at the connector for the motor, and there is nothing. There is a little >1V spike when I first switch the heat on, and then it drops.

Anyone have any ideas? It's starting to get chilly.

 

Check the faq.

 

I knew someone would say that..

I saw three heat related threads.

1. This one is no help

2. This is no help. There is no power getting to the blower at all.

3. This is one doesn't describe my problem, but I got a new resistor on the way just because I can't think of anything else.

 

How did you check for voltage?

 

Multimeter, right at the connector that plugs into the blower.

 

lol, I figured that, but was the ignition "ON"? So no voltage between the 2 connector terminals. What about the Blu/Wht and a good body ground? If there is no voltage between the Blu/Wht pin and body ground, then the there is an open in that wire somewhere between the connector and the ignition switch.

 

Car was running when I tested it. Didn't check any other wires. New resistor will be here tomorrow. If it doesn't work then I shall check.