Okay, I replaced the fan motor because it was making some HORRID noise and would only work on the highest speed setting. Still only working on highest setting, so I replaced the switch panel on the dash and it still only works on highest setting... So I assume that there is a control module somewhere under the dash. Is that correct or am I missing something?

 

Yep, there is a resistor pack near the blower motor. I had the same situation when I first bought my truck. Ended up being a solder that had failed. Re soldered it, and had all speeds again.

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Check this old thread out:
https://www.dieselbombers.com/24-val...eater-fan.html

 

SWEEET!!! Thanks!

 

No problem at all!! Look forward to hearing what you find.

 

The solder joint was busted, but the white porcelain is all busted up and half missing, so I replaced it with a new one for $50