Blower Not Working

[sawmkw]

I have a 96 Tahoe and have looked through the dozens of posts about the blower and resistor but have not really found an answer. A couple of years ago I replaced the resistor and the fan switch. Earlier this year the fan would not come on at all or only on high which led me to think resistor as it bypasses the resistor on high (I think). Now it does not work at all. I checked the fuse and it is good and pulled the black and purple wires from the blower motor. With the fan switch on high I do not register voltage on either wire (I don't know which one is ground) so I suspect the blower motor is working.

Is there a good place to start on this? Do resistors only last a year or two? The first one lasted 15+ years. I'd kind of like to test it out rather than throw parts at it but I do not have a wiring diagram.

Any guidance is appreciated.

 

[07burb]

It's most likely your resistor again. I've got a '98 and I had to replace the resistor in March. Well guess what....It's broken again so I have to replace it once again and that's less than 6 months. This time I bought an AC Delco resistor and am planning on doing the swap this weekend. I think last time I bought an off brand of some sort. Hopefully it last me longer this time. I say all that to say that a resistor only lasting a year is not out of the realm of possibilities and is most likely your issue now.

 

[lesterl]

I would suspect your switch and harness connector might be melted/ burnt? Pull the pannel out and with fan switch/ igntion on, wiggle the wires.

 

[sawmkw]

It's most likely your resistor again.

Well, I replaced that resistor with an AC Delco and no joy.

 

[sawmkw]

I would suspect your switch and harness connector might be melted/ burnt? Pull the panel out and with fan switch/ ignition on, wiggle the wires.

I'll give this a try. I have replaced the fan switch in the past and it might be shot again. Is there a wiring diagram for the Heater/AC circuit somewhere? I haven't been able to find one.