Fan blower only works on high speed....
I have the Itasca detailed below, and lately has developed an issue where the dash fan will only work on the high (noisy!) switch setting. After starting the engine (Chevy workhorse 8.1 engine chassis...
Forum Discussion
OK, I found the resistor assembly and removed it for inspection. It looked pretty much like the picture posted by AstroRig except the left coil resistor seemed to be tarnished and it looked like some of the adjacent coils were touching (which may defeat the purpose of the coils?). (I'd post a picture except I can't figure out how to do that!)
All the contacts on the assembly had continuity as tested with a test lamp from the 12v contact, and I couldn't notice any decrease in 12 volt light intensity between the various resistor circuits.
Does the fact that the left coil looked corroded indicate it's necessarily bad?
I then removed the fan switch on the dash and tried to test it with an ohm meter, but found no rhyme or reason to which contracts provided continuity in various switch positions, so maybe it is bad? It's an INDAK off/low/med/hi switch with no part number, but a patent number of 3 159.722. I'll try to figure out how to post pics of these things....maybe below...?
All the contacts on the assembly had continuity as tested with a test lamp from the 12v contact, and I couldn't notice any decrease in 12 volt light intensity between the various resistor circuits.
Does the fact that the left coil looked corroded indicate it's necessarily bad?
I then removed the fan switch on the dash and tried to test it with an ohm meter, but found no rhyme or reason to which contracts provided continuity in various switch positions, so maybe it is bad? It's an INDAK off/low/med/hi switch with no part number, but a patent number of 3 159.722. I'll try to figure out how to post pics of these things....maybe below...?
