Join Date: Nov 2007
Location: Stoney Creek, Ontario
have an issue.... only the highest fan setting works on my 98 f150.
what would be the issue and best way to resolve...?
Looks like your thermal limiter is gone. Its located on the plenum behind the glove box.(at least it is on the 2000)
Here's an excerpt from the service manual:
Blower Motor Thermal Limiter
The heater blower motor switch resistor has the following features:
The assembly is located on the passenger side of the plenum assembly behind the glove compartment (06010).
Three resistance elements are mounted on the resistor board to provide four A/C 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 protective 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 HI.
The thermal limiter cannot be reset and is not serviceable.
You'll have to replace the whole board.
2007 F 150 FX4 and 2003 Outback 25FBS