Ford Escort Blower fan

============================= Most likely the fan itself. It is posible there is a short on the "3" or "4" circuit. Or it could be the circuit breaker that you have to reset is bad causing it to trip when it has a good heavy load on it. Does it trip right away? If it doesnt, takes a while, or even a second or two, it probably isnt a short.

I can't think of anything but a binding motor. Since it's mounted vertically its thrust washers probably take a beating, but it wouldn't surprise me if the felt wicks that hold oil for the bearings have dried out because I found that by lubing them every year I could keep the motor from squealing. This motor is held together by bent tabs, which can break if bent too often, so I drilled holes for screws to replace them. I also clean and lube the thrust washers and clean the commutator. My factory original blower started to squeal in less than a year,

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Try removing the fan and bench testing it.

When I did this I found that the plastic cover was holding in water that had gotten into the vent intake and essentially the motor was under water. I let it dry out overnight and it works fine now. (I recommend that you let it dry out longer if that is the case with yours). I also drilled a small hole in the plasti cover so if any more water gets in it can drain out. I also cleaned out the area between the hood and the windshield to get rid of the leaves and crap that was clogging up the fender drain holes.

its not tripping out on 1 or 2....so its not going to be the fan.............its more likely to be the resistor pack that controls the reduced voltage when you select a slower fan speed........