1999 Jeep Wrangler 4cyl W/AC, Blower quit, replaced blower motor, resistor, control panel, fuse and relay. Still nothing. Wires look good with no burnt connetions. I can not find a diagram to map the fuse box in engine comp and the lables only tell amp not what it is for.
Run a new wire to the motor from the switch this will do 2 things for you. It will tell you if your switch is still good, and if it works you just fixed your problem.
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the book is free,
real books, not fake
this is a TJ wranger,
the HVAC chapter and 8w wiring chapter covers all that.
as posted here 100s of times. (sure finding it in 1zillion spam hard)
8w-42
blower dead on HIGH, (answering
for...)
Fuse FB8
Fuse PDC #1 to blower relay.
or bad relay
or bad controls.
Did you replace the bloer motor also, usually a resistor failure is caused by a failing blower motor. here is a diagram to help with diagnosis, Make sure you have voltage at the blower motor connector with the key on. If not verify the fuses and the blower motor relay shown in the diagram. If voltage is present diagnose the ground side. The ground path goes from the motor, through the resistor, through the selector switch, then to the ground listed in the diagram.nosis.
There are two fuses a 40 amp in the power distribution center and a 10 amp in the fuse block. Are they good?
This is a ground side controlled system meaning the switch provides ground instead of power. With everthing plugged in there should be power on all the wires coming out of the blower motor resistor ( brown w/ tan, Light Blue, Light green w/ black, and tan wires). If you ground any of those wires the blower motor should run. If it does check the dark green wire at the HVAC control head. Backprobe that wire with it plugged in if there is power than either the control head is bad ( the mode switch has the final say in the path to ground for the blower motor. When the mode switch is in the off position the blower will not work. When it is in any other position (vent/floor/defrost) it allows the path to ground for the blower motor to be complete.
The last thing to check is to make sure the black wire coming out of the control head has a good ground. That is the final path to ground for the blower motor.
This is definitely 100% the Blower Motor Resistor.
Replace this and all speeds will work fine.
This Resistor is defined with 3 to 4 wires going into it, and is located adjacent to the Blower Motor.
It is easily access, removed and replaced.
I will post an additional comment on Part Number, Price and where available.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!
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.
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.
If the blower isn't working there are a few options.
Look in your fuse box under the dash on the drivers side and check the fuse that should be marked blower motor.
Next, The blower motor relay will be in a long rectangular box, near the battery. It will have a cover with a couple little clips that you have to squeeze to get it off. The lid of the box on the inside will have a diagram that tells you which relay is for the blower motor. If there is another relay with the same number on the back, you can swap it and see if the blower works. That's the easier way to see if that's the problem.
If it's none of those, then it's probably the blower motor itself. I would check to see if it's getting power before you replace it though. It could be the fan control switch on you dash too, but they don't go bad as often.
nosis.
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