I am working on a '99 Wrangler. The heater fan did not work so I installed a new switch. Still did not work. Resistor looks fine. I probed the connector and got low speed only when I bridged to a good ground. It only works on low speed. What do you suggest?
I did look at the resistor and it appeared fine.. not burnt or broken coils. Fan works fine on low, but not any other speed?I did look at the resistor and it appeared fine.. not burnt or broken coils. Fan works fine on low, but not any other speed?
The fan works when probed in the harness without the switch. New switch maybe defective so I am getting another plus resistor.The fan works when probed in the harness without the switch. New switch maybe defective so I am getting another plus resistor.
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Could still be a faulty resistor mate. Easy to change and cheaper than changing the fan to start with, Do you have a Multi Meter? Could still be a faulty resistor mate. Easy to change and cheaper than changing the fan to start with, Do you have a Multi Meter?
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seriously I would be making a jumper wire to the battery for the blower .. power it directly..as long as you put a fuse in the line..and an on-off switch..
According to the wiring diagram, it looks like the blower motor is grounded thru the resistor which is grounded thru the fan switch on the dash. High speed bypasses the resistor. If you have power on the terminals coming out of the resistor, the problem could be in the fan switch.
The fan uses a resistor block that creates the various fan speeds. It sounds as though the lower two fan speed resisitors are broken. This means you will have to replace the fan resistor block. The only other possibility would be the fan switch on the dash you use to set the speed. It is most likely the resistor block, but if you are handy with a test light, you can verify the switch is good or bad, or take it to your favorite mechanic and have him or her verify.
good luck.
If
it doesn't blow at all, and/or you only feel a small amount of air
coming through the vents (not forced), it may be the blower motor
switch.
Sounds as though the fan motor could have failed (the noise), if you
have fitted a new resistor pack and the fuse is OK, probe around with a
multi-meter tracing the supply (12Volts to ground) through switch to the
fan. The heater/aircon blower is fuse 64 - 30amp (if I dont mistake). If the motor itself is
shorting out then this would blow this fuse. Try a 12v feed direct to
the motor terminal and see if it works.
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 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.
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
It may be a fan resistor if the fan is not working or only working on one speed, the fan ressitor is about $40.00 and is usually located under the glove box on the heater box, look for the plug that goes to the resistor unscrew the hold down bolts unplug the old switch and install the new one.
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.
I did look at the resistor and it appeared fine.. not burnt or broken coils. Fan works fine on low, but not any other speed?
The fan works when probed in the harness without the switch. New switch maybe defective so I am getting another plus resistor.
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