About Van Expertise I can answer most questions concerning 4X4 engine, drive line, suspension, electrical, and fuel, both diesel and gasoline. Ford, GM, and Dodge, old and new.
Experience I have been maintaining a fleet of approximately 55 light, medium and heavy vehicles for over 20 years. Most are 4X4 pickups and off road fire fighting trucks.
Question My AC runs for about an hour in the morning just fine. I commute to work about an hour. This morning the AC worked fine for about 50 minutes and then just shut off.
When I went to lunch at noon. It would not come on at all.
When I left the office at 5:30 the AC came on fine all the way home for about an hour.
It has done this for three days in a row.
I never know when it is going to work. A repairman says it's probably the blower motor (estimated around $500).
I have been seeing on the Internet something about a resistor located behind the fire wall (passenger side) below the glove box. Is the resistor easy to replace? Easy or hard to get to?
Any assistance would be appreciated.
Answer Hi Mike,
The resistor, and the blower motor are both easy to get to.
500 is an outrageous price. I can have that motor in your hands in about ten minutes. Access it under the pass side of the dash.
The resistor just helps in the different speeds, and isn't used at all during hi speed.\
The blower switch used to give problems like that, but I am thinking that problem was corrected when they started using relays.
I would be looking for a loose connection, and possibly checking the freon charge, although I doubt that is the problem if it works good when working.
Testing for voltage directly at the blower motor is the correct step. If there is voltage, and a good ground at the motor, then the motor is bad.
If there is no voltage, or extremely low voltage, then a switch, connector, or relay is where I would look.
