Blower not working in 2000 jeep wrangler. worked intermittently before it quit. replaced fan/motor, resistor, and switch in dash.still not working. next step?
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Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.
If it only works on Hi, then your resistor is blown. If you can pull the connector to the blower fan and use a voltage tester to find voltage there with the fan switch turned on then it's the blower motor. If there is no voltage there, then its the switch on the dash. Usually the resistor and the switch only die because the blower motor is about to die and is pulling more current then it's supposed to. Change the blower motor too if that's the case.
thats is two different problems. the blower motor resistor is bad causing it not to work on the lower setting just high. now on the defrost not working could be the blend door actuator but to figure it out you will need to be diagnosed by a professional. it is a little more involved. but the blower resistor is fairly easy
Likely either you have an intermittent short in the wiring, or, most likely, the blower motor itself is drawing too much amperage and is overloading the system. This can also happen if the blower motor or dash ground is not well connected or corroded.
I'd replace blower resistor, usually found under hood on firewall on passenger side, or on duct work, inside under dash on passenger side,close to blower motor.
Usually, when the fan works only on high speed the issue is with the blower motor resistor. It will be located under the dash close to the blower motor itself. It will have a multi-wire plug and feeds signal to the blower motor. An updated resistor maybe available in which case a slightly larger hole will have to be cut for the new resistor. This is not a difficult proceedure, only a couple of screws are holding the resistor in place and most resistors are resonably priced. I recommend you buy the resistor at the dealer, this is a case where you get what you pay for.
Good luck, hope this helps.
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