2002 Ford Explorer 2WD XLT 4.0 with 215,000 miles. A/C fan motor replaced last year. A/C and A/C fan works fine. VERY little air comes out of the vents now. Blower motor resistor? Air temp actuator? Vacuum control air door? Vacuum control check valve? Vacuum tubing leak?
It sounds like the blower motor resistor, does the air change speed with different manual selections?
June, 28, 2013 AT 12:52 PM
The blower motor switch controls blower motor speed by adding or bypassing resistors in the blower motor switch reistor in all function selector switch positions except OFF.
The blower motor resistor
- is located on the heater core and evaporator core housing near the blower motor.
- has three resistor elements mounted on the resistor board to provide four blower speeds.
- depending on the blower motor switch position, resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
- has an overheating device (thermal limiter) that will open the resistor coil when the temperature reaches approximately 184 cel interrupting the blower motor operation in ail speeds except high.
- is serviced as an assembly. The thermal limiter cannot be reset and is not serviceable.
June, 29, 2013 AT 10:50 AM
Yes, the air speed does change from low to high with manual selection. I have taken off the A/C plastic face plate off that covers the A/C and radio and removed the glove box lid but did not find anything broken, damaged or unplugged.
June, 29, 2013 AT 1:11 PM
Okay. Is your vehicle equipped with dual automatic temperature control?
June, 29, 2013 AT 5:27 PM
Single temp control on the dash for the front air. Temp control for the rear air on the ceiling console.
At times air comes out the regular A/C vents, then, when you get on the expressway, what happens is the air vents (front seat air) become blocked and the A/C air comes out of the heater and defroster vents instead of the A/C vents. Fan motor and fan speeds work fine all the time.
June, 30, 2013 AT 10:51 PM
Couple of things it could be. I'm not sure if I understood you correctly, is there an (automatic) label on your temp. Settings?
It sounds like a vacuum related problem. As you speed up on the highway, you loose pressure by the increased engine speed.