Any of you guys seen this?:
Blower no workie on Lo and Medium, but great on Hi. Easy fix right? Replaced the resistor with a known good one, and CRAP: Still no Lo & Medium. Maybe it's the relay. Replaced with a known good one. Still no work.
Alright..measured voltage at the blower motor connector: On my working '80 truck, it's 12 volts at all Lo-Med-Hi positions, so it's just the current that obviously changes, thanks to a good resistor. But on the project '80, it's around 5 volts on Lo & Medium. Switch to Hi and the volts go to 12, and works great.
So, it's gotta be the Lo-Med-Hi switch, right? Anyone else seen this? If you have, and have the part number handy, I would love to hear from ya! <img src="/forums/images/graemlins/shiner.gif" alt="" />

Most likely LMH switch ; remove and test before buying a new one.

Those switches are known for going bad. Mine got so hot it melted the switch itself and stuck on hi. I had to unplug the switch from the fan so that it would shut off. When I showed it to the techs at the dealership, one guy said he had one on his desk. They said they replace them all the time, but mine was the worst he'd ever seen.

About $50 from the dealer part # 84732-35030 for a 90 pickup.

Good luck,
Matt

Thanks Matt. Appreciate it! <img src="/forums/images/graemlins/cheers.gif" alt="" />

No problem, I just hope it takes care of the problem.

<img src="/forums/images/graemlins/kewl.gif" alt="" />

Steve I can check to see if I have one laying around.
Jeff

It ain't the switch!
Swapped the blower switch from my driver to the project 4X4. Same result...only Hi works. Soooo....gonna buy the resistor, the proper one (non-air conditioned), as there's nothing left in the circuit. Anyone wanna bet this $22 part fixes it? <img src="/forums/images/graemlins/rolleyes.gif" alt="" />
P.S.: Took the project's switch apart, cleaned the contacts (weren't too dirty or worn), and it ohm'ed out the same as before.

Yes it's the blower resistor. My lowest speed didn't work so I ordered one from Autozone. Super easy to replace and a nice cheap fix.

Blower resistor going out is pretty common. However, I've also had to resolder the fan switch in a couple rigs before.

Dammit! Went to RadioShack, bought a 1.2 and 2.7 ohm wirewound resistors, soldered them to their proper place in the resistor, mounted it and...still only works on HI!
Those Toyota resistors can't be returned once bought. I'm looking at the blower motor now, Sheeeeeezz <img src="/forums/images/graemlins/scared.gif" alt="" />