Questions and Answers
Ford Explorer Won't Blow
Q. Good Day Vincent, I recently bought a 1991 Ford Explorer with the 4.0 liter, automatic transmission and 164,000 miles. I have a problem with the heater/AC. When I rotate the fan motor switch the fan does not come on. If I push it in to engage the A/C clutch that part of the system works. I don't wish to rip into the dash before I can find out the real cause for this.
I also would to find out if I am guessing right on a transmission problem. When I first start out in the morning I put it into OD and drive away and it will not always shift. Once the transmission warms up to normal operating temp it will shift pretty normally. It does take a little time to shift once in a while but not often once it is hot. My guess is one of two, is it possible that the seals are shrinking and once hot expand? or that the transmission fluid has gotten to the point it needs to be replaced/flushed?
I have asked you questions on other issues and your replies were very helpful in finding the cure. Any assistance in the above problems will be highly appreciated.
Thank you,
DonatoA. As for the blower motor, if it does not work at any speed, you probably have a bad motor. Power for the blower motor is supplied by fuse #9 in the fuse box. It goes to the motor, then to the blower motor resistor, to the speed control and then to ground.
First thing to do is to see if you have power to the blower motor. Check brown/orange wire for power. If there is no power, either the fuse is blown or there is a broken wire. Then check the orange/black wire at the blower motor. If there is power at the brown/orange but not at the orange/black, you have a bad motor. Confirm this by grounding the orange/black wire. The blower motor should operate.
The orange/black wire goes to the blower motor resistor and the speed control. If the blower motor resistor is bad, the blower motor will still work on high speed. If it does work on high speed, replace the blower motor resistor.
If everything checks out so far, then the problem is probably in the speed control. You'll have to pull the panel out and check the orange/black wire for power and the dark blue/white wire for ground. If you have power and ground, it's a bad switch.
Additional Information provided courtesy of ALLDATA
