Explorer Sport Trac 4WD V6-4.0L VIN K Flex Fuel (2004)
Blower Motor Resistor: Description and Operation
HEATER BLOWER MOTOR SWITCH RESISTOR(S)
The front heater blower motor switch resistor has the following features:
-
The assembly is located in the engine compartment on the evaporator housing next to the blower motor assembly.
-
Three resistor elements are mounted on the resistor board to provide four blower motor speeds.
-
Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or
increase A/C blower motor speed.
-
An overheating device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower
motor operation in all speeds except high.
-
The thermal limiter cannot be reset and is not serviceable.
The second row heater blower motor switch resistor has the following features:
-
The assembly is located in the high-series flow-through floor console next to the blower motor assembly.
-
There is one resistor element are mounted on the resistor board to provide two blower motor speeds.
-
Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or
increase A/C blower motor speed.
-
An overheating device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower
motor operation in all speeds.
-
The thermal limiter cannot be reset and is not serviceable.
