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The speed control for the heater/air will only work on the highest setting when you turn it. So the fan does work, heat blows out, but only at the highest setting. It's a 2001 5.9.
Thanks/Jim
Also, a late thanks for those who have responded in the past.
The blower resistor needs to be replaced. It's located next to the blower motor. Crawl under the vehicle and look upward from behind the passenger front tire. It will look something like this ...
All of them that I have seen are on the air box under the hood.
This a pic of mine while I was replacing mine with a different unit and cleaning out the air box.
Guys, thanks for the responses. It's the weekend so I got the chance to pop the hood. My question is that I unplugged the cable and the fan still runs on the top speed???????? I assumed it would be dead. Also, there is no inside wiring just some coils and a resister. So even though the fan still runs with the cable unplugged it's still that module?
Once again thanks for the replys, just trying to save some money doing some simple repairs.
Jim
Also, there is no inside wiring just some coils and a resister. So even though the fan still runs with the cable unplugged it's still that module?
The coils are the resistors. The item that you think is a resistor is actually a thermal fuse. If the coils get so hot as to where they could cause a fire, the thermal fuse blows and kills power to the coils(resistors).
High speed does not run through the resistor since you'd want full power to the motor. That's why the blower will run on high without the resistor pack connected. So to answer your question, yes the resistor module can still be bad.
Just put in the new module and the fan works on all speeds. Thank you to everyone. Your responses probably saved me $75 or more. And the module is just under the hood.