I have a 97 2.3 that has heat but the blower doesn't come on. I've recently replaced the blower fuse, blower resistor, blower resistor connector, and blower relay. The blower motor works with 12v run directly to it and like I said the heat does come on but it just trickles out of the vent. I also know that the belt tensioner is damaged but it holds the belt on tight enough to drive and recharge the battery.

Could the damaged tensioner have this type of effect on the blower? I'm wondering if it is possible that it isn't getting enough power to the alternator which therefore isn't getting enough power to the blower?

 

Did you remove the blower motor itself and check for debris blocking the heater core ?
Mice love to crawl in there and build nice big houses.

 

When you turn on the blower does the truck dim all of the lights, or does the idle speed drop a bunch?

It's sounding like you're gonna have to trace all of the wiring associated with the blower with a multimeter to check for shorts.. OR maybe the switch in the cab is bad? OR could it be the blend door??? I'm not up to speed on the blend doors operation..





GB :)

 

I pulled out the whole motor and bench tested it and it worked fine. I also ran some current back to it again after I put it back in to make sure it was seated properly. It seemed like everything was free and clear.

 

Then it has to be the switch or the wiring between the two.


GB :)

 

There is no noticable idle change or light dimming.
I agree that the switch in the cab might be bad. but that's just because it's the only thing that hasn't been replaced yet. I've avoided this primarily because I don't want to pull apart the dash to get to it. Unless somone know of some other way to check this switch.

 

That part of the dash is super easy to take apart. It's seriously like 3 screws.


GB :)

 

thanks for the help...I'll check it out in the morning.

 

Okay it took longer to get back to this than planned. But I replaced the switch and it is still not working.
Here is another thought... Earlier this year the ac compressor shorted out. Instead of replacing it I just bought a shorter belt and bypassed it. I can live without the A/C but I still need heat and defrost. However I had to disconnect the electrical connector to the compressor because it kept blowing the fuse.
Is it possible my problem is because the compressor is no longer in the electrical chain? Do I need to do something with the compressor electrical connector like jump it our route it elsewhere?