On the Passenger side under the dash. It is attached to the ductwork for the air. You may have to pull the carpet back some. It looks like a flat rectangle that has ridges on it and is made out of clay or ceramic. replacing it is cheap and easy. I did have to get the part online for myself. I went for over a year at one setting I couldn't get over the fact it was just because of that stupid piece.
Heater blower resistor is what controls the low medium high speeds...
In the power distribution box under the hood. There is also a relay there that controls the fan. and last but not least, there is a resistor that controls all fan speeds.
You most likely have a problem with your blower RESISTOR PACK or rheostat. This is what controls the high, med and low speeds on your heater. Where it is and how to change it depends on your vehicle.
Blower fan resistor controls electric current to the fan motor to maintain different speeds.
A bad heater blower motor resistor would effect one or more blower speeds other than high.
the blower resistor controls the fan speeds
It sounds like the blower resistor assembly is defective. All fan speeds except for high go through resistors (that is what controls the speeds from low to high). Number 4 is high and has the full 12 volts going to the fan.
replace blower motor resistor. It is under the passenger side foot well.
replace the resistor pack on the fanblower, under glowecompartment
toyotas have a resistor bank in line with heater motor each speed has a different value resistor. there is no resistor on high speed. it is located on passenger side in heater duct I thank it has two screws holding it on when you get it out you will see the resistors burned
The resistor block or blower motor resistor is used to control the speed of the blower motor. That is how you get the lower speeds on your air conditioning or heater. The higher the resistance the lower the speed of the motor.
The blower resistor controls the speeds of the blower motor Hi-resistance lower motor speed Lo-resistance higher motor speed