Why No Heat?

Why No heat? First of all, the fan won't turn on. Must figure out why.

I've traced the wires coming from my "Off, Low, Hi" Fan switch to my Fan Motor Resistor.

I have power to the resistor. Good. Next I removed the Fan and the cage.

First I must see if we have a good fan motor. I put 12v power to the motor and presto, the fan spins. GOOD. 

Next I removed the wires going to the Resistor. I have power to the resistor put nothing from there to the fan. 

I removed the resistor from the housing and examined.

Well take a look for yourself. Rusted to the max. Even though this is a 3 speed resistor, I'm only using it as a 2 speed. Low and Hi. Lots of options back in '79

Here's a picture of the side that the worst, however, if I took a picture of the other side, you would also see the Hi Speed terminal has been broken off. The Hi Speed would have never worked. Now it's time to try and find a replacement. Lucky for me, International used some GM parts back in the day. I have found a replacement for my resistor. I also ordered a new Resistor connector. I'll have to rewire for new connector but I'm sure it will be better in the long run.


Next on the list is my A/C.