Repair blower motor resistor for chassis air. The fan would only run on high, I've had this trouble before in cars so I knew where to look. I actually had this same thing go out about two years ago and replaced the resistor block at that time. At that time found out this part is not available from Winnebago any more and didn't think to call Friegthliner don't know why. Anyway went down to Auto-zone and found Dorman 973-013 Blower Motor Resistor it was off a ford truck. It was about $14.00. Most of the time I ran with the blower on high so I was surprised when it went out so soon. Pulled the resistor block out and all the little coils were still in tack so put an ohm meter across them and they were good. The only place current did not go thru was the Therma Fuse. The next problem is finding the right one the one from the ford must have been too cold. After about an hour on the internet could not find the correct temperature rating, called Winnebago and Freightliner and they could not tell me, probably just did not talk to the right person. Someone knows but they sell the part as a unit. So I gave it a shot in the dark and ordered 133 degree Celsius (5 of them for $5.00 including shipping). Now for the repair, thought about soldering the new in using heat sinks but the forms say even with heat sinks you run the risk of getting it to hot. So I drilled out the holes and crimped it in.