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 ...

 

Are you sure about this? On my 2000 the resistor is right there on the top of the air box under the hood.

 

Yep, you are right. I looked again and there it was up on the HVAC case easy to get to. I got it confused with the blower connector down below.

 

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.

 

I have a 2000 ram 150 I have replaced the resistors a couple of times.
What make them go bad? Fan motor?

 

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

 

Yes, a worn motor draws more power than a new motor. The added load contributes to the early demise of the resistors.

 

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.