For some reason when i put on my heater it only comes on sometimes and generally sounds like crap until it dies. I can hear the relay click every time i move the lever so I'm pretty sure that's not the problem. I stumbled across something called the motor resistor online the other day and I'm curious if based on the little information I've given someone could confirm that this may be the problem? Any feedback appreciated.

 

Sounds to me like the blower motor is worn out. Good info on blower motor and resistor repair here:

http://www.4crawler.com/4x4/CheapTricks/Blower.shtml