When I turn on the fan it doesn't work in low or med settings but will work only in the high speed.
Item that need to replace is the blower resistor.
It is on the firewall side.
SOURCE: Heater fan only works on high after replacement of heater core
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,
SOURCE: air condition fan only works on high speed, no low speed
You have a bad blower motor resistor. This is located under the dash close to the blower motor itself
SOURCE: Low speed on heater fan does not work. All other
You will need to inspect and test the speed control resister and the speed control knob first. What have you done so far?
SOURCE: 1994 silverado heat is not working. Replaced
I think that one still uses cables to control the blend doors and vent doors. Are you sure those are working and/or connected.
Also when you replaced the thermostat and heater core did you bleed the cooling system? With the engine cold remove the radiator cap and let engine idle up to operating temp while keeping the radiator topped off with coolant.
Are the hoses going to the heater core hot?
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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