My 97 ram has a problem with the heater blower, it wont always work, also sometimes when it is working it will run ok for a long while then it will slow down to just barely able to hear it running, checked relay it tests good, I dont think its the resistor cause it will run at different speeds, anyone have this problem before? any help would be appreciated Mick

 

It's fixed, was the blower motor, replaced and all is fine now Mick

 

sounds like high resistance in the motor itself