Heater Fan doesn't blow on low

[kna4977]

I’ve got medium and high now. On low the fan doesn’t blow at all but the resistor turns red. Also turns red on medium but the fan also blows.

[dmjlambert]

You're making progress. The bearings could be going out on the blower motor, or your squirrel cage fan maybe rubbing on something. If taking the blower motor out I recommend treat the rubber hose that goes between the motor and the evaporator casing with care, because it is not reproduced. Mine was cracked and I restored it to reasonably good condition with super glue and black RTV.

[kna4977]

Originally Posted by dmjlambert

You're making progress. The bearings could be going out on the blower motor, or your squirrel cage fan maybe rubbing on something. If taking the blower motor out I recommend treat the rubber hose that goes between the motor and the evaporator casing with care, because it is not reproduced. Mine was cracked and I restored it to reasonably good condition with super glue and black RTV.

I’ve tried new switch which it needed anyway. The old one worked but was dangerous and would spark. New resistor no change, fuse and grounds are good. New relay no change. Anything else it could be besides the blower motor itself? Parts are cheap and I can return the ones I don’t need.

[Rust_never_sleeps]

you could hit the positive term on the blower motor with a direct battery wire and see how it spins before you pull it apart