Question about 1999 Jeep Wrangler
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Posted on Jan 02, 2017
SOURCE: 1999 jeep wrangler heater blower
you need to change the resister block for the fan. it is located on the heater duct near the fan... there is a connector on it and two or three screws holding it in.
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Posted on Feb 21, 2009
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
let me know if you have any ore question
Posted on Dec 04, 2009
Testimonial: "The blower motor resistor as the cause for the fan only working on one speed was exactly correct. Bought a new sensor, installed and problem was fixed"
If you bypass the resistor pack and connect the motor directly to the fused 12v supply then the fan should run at maximum speed. If so, it's the resistor pack that's blown: a very common fault on a huge number of makes and models.
Posted on Feb 13, 2010
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.
Posted on Mar 25, 2010
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