2001 Mazda Tribute (3.0 L) Heater motor functions on high only

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Mazda Tribute 2001-06 Firing Orders Repair Guide

AutoZone https://www.autozone.com > diy > mazda-tribute-2001...
3.0L engine Firing order: 1-4-2-5-3-6 Distributorless ignition; Fig. Coil and spark plug arrangement-2.3L engine; Fig. 2.0L engine Firing order: 1-3-4-2 ...

Mazda Tribute

mazdabg.com https://www.mazdabg.com > 9308CH10_Mazda_Tribute
Mazda Tribute. Fig. 14: 2.0L (VIN B) Engine Firing order: 1-3-4-2 Distributorless ignition system. Fig. 15: 3.0L (VIN 1) Engine Firing order: 1-4-2-5-3-6 ... Pictures

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it is the control mogul

Torque Converter Clutch Solenoid is suspect, also is the Shift Control Solenoid (they are twin cylinder assembly looking like the old blinker solenoids) attached to the transmission, and with 2 wire pigtail. Check for a short~continuity between heater fan hot wire and the Shift Control System pigtail wires. Thank You for using FixYa.com Let us know if you still have a problem!

your heater core could be clogged. flush out your whole cooling system and hopefully that fixes the problem

blower resistor is blown and the blend air doors or motors are broken

Its probable that if youre using no 2 and 3 and not 1 or 4 thats its worn out on these settings and you will need to replace the switch,its not the fan (obviously)and it does change speed so its not the resister,really looks like the switch needs checking and or replacing

there is a flapor motor that is controled by vacume, check for leaks in the vacume lines on the engine.

It probably is the fan switch itself. They are around $30. for a new one. You can take it out and check to see if you have power to all the settings with a ohm meter or test light. They are not real hard to take out.

It's very possible the fan motor has quit. The squealing noise is caused from motor bearing failure. As the bearings wear out or dry up the motor is harder to turn and require more current to run the motor. On lower speeds, the motor runs off a series of resistors that reduce the amount of voltage and current so the fan runs a lower speeds. If the bearings are worn, there is not enough voltage or current to turn the motor and that's probably the humming noise your hearing.
Good observation by the way.
Let me know.
regards,