My 2001 mustangs fan for the AC and heat only works on the highest speed but not any of the lower speeds. I replace the blower motor resistor which fixes the problem but within 2 weeks it burns out and again, only the highest fan speed will work. I can’t afford to put a new switch on every 2 weeks. …

Guess number 1, a blower motor drawing too many amps.

Barkydog is correct; the blower motor is drawing too much current. Odds are if you connected an ammeter to the blower motor you would likely be shocked at the amount of amps being pulled by the blower. The blower motor is not that much and the blower can appear to work fine even while drawing an in…

A spinning motor generates a back emf (basically acting as a generator). The faster it runs, the higher the back emf. The back emf reduces the current from the startup value of the motor. If a motor (for some reason) is restricted in speed, it will be drawing a higher current than designed for a…

[image] oldnotdeadyet: or the flow is restricted sufficiently, there will be an excessive current, Actually centrifugal fans do the opposite. When either inlet or outlet is restricted, they don’t move any air and with a load reduction, the speed goes up and the current goes down. Block your v…

That’s one of the fan laws. [image] Understanding Centrifugal Fan Motor Performance Since air is what we work with it makes sense to insure that our students understand airflow and fan performance. Fan motor performance is o... Tester

Well, I learn something every day! Is the typical squirrel cage fan a centrifugal fan? Fast or slow? For our OP, are we saying that a blockage is expected, and the fan is running fast and the resistor is blowing because it is uncooled? Or, do we think the motor is running slow so the current dr…

blower motor could be the culprit, but also check the wiring at the resistor. If it looks burnt or melted at all, get a new connector and wires. I have seen bad wires take out a new resistor.

A fan that takes air into its center and then flings it out is a centrifugal fan. So yes. Tester

Blower motor resistor keeps going out?

Maintenance/Repairs

J162_165342 October 21, 2020, 2:47am 3

So just replace the entire blower motor unit?

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Blower motor resistor keeps going out?

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