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1993 Cherokee the fan only runs on high and off. switch has been replaced. any ideas. would be nice to have other speeds.

thanks.
 

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check the blower motor resistor.
yeah, check that. also, you may have a short else where, like the contactors in the switch. was the switch used? it seems like all Cherokees do this, including mine. so if it was a used switch it could be bad. the switch also could have shorted out during installation. pull it out and do a resistance check on the switch, blower motor, and resistor. basically, start from the switch and work your way down.
 
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