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.