Blower Doesn't Work on #3
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Year: 2000
Model: Cherokee
Engine: 4.0
Blower Doesn't Work on #3
I have a '00 XJ Sport. My Blower works on all the positions but #3. Is the switch the likely culprit here?? Thanks for any input,
Jeff
Jeff
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Nope, switch is nearly indestructible. Speeds 1, 2, and 3 are run through a resistor pack that steps down the voltage for a lower fan speed. What usually happens is that this blower motor resistor goes out. $15 or so on RockAuto.com and easily replaced.
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I guess what I am hearing is the resistor is bad then?? Every one I've ever replaced has been bad with only the high setting working.
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Year: 1999
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Engine: 4.0
If you have an Ohmmeter you can check the continuity of the fan speed control circuit, from connector C209 back to the fan speed control on the AC/Heat control panel. The C209 connector pinout shown on the schematic. C209 is accessed by rolling down the glove box.
With the fan speed selector switch in #3 position, read from pin 4 in connector C209 to chassis ground. There should be continuity.
The blower connector has a habit of melting. If its in good shape you can read the resistance of the #3 resistor in the resistor block. With the connector removed from the block, read between pins 3 and 4 on the resistor block. If you read an open the resistor is smoked. You can do a comparison on the other resistors.
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