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Possible that the rheostat or the multiswitch has some contact problems.You must have an access to the switch settings to measure any outward voltage to the fan.If there is no voltage then the switch is defective.If there is contact then the controller is defective and is not reacting to the set point.
You probably have a bad fan switch. I had the same issue and had it diagnosed and replaced. It fixed the problem, but it seems to be coming back less than 2 years later.
Its the blower motor resistors or the switch itself.
You need shop manual. Then remove the switch and jump certain terminals with a jumper wire to see if fan runs at certain speeds. If fan runs at all speeds when jumped then the switch is your problem . if it runs at the speeds you described in your write up then its the resistors.
these systems use a resistor pack,setting 1 2 3 go through resistors to vary fan speed, 4 is fast speed-- no resistor in circuit. don't know where it is located but usualy in aplace it can get cool air, try follow the wires back from the fan motor to the switch.
does it turn off when the car turns off? if so, you probably need a new blower motor resistor. They run about $80 but shop around. Fixed my problem right away
Alot of people have the same problem with the fan switch and blown bulbs. There really is no fix for this. Jeep really screwed up when designing the heater control assembly. The cheapest solution is to buy another unit off Ebay. Can always go to the dealer but be ready to PAY for there mistakes.
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