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This '90 YJ had been blowing heat for a couple years but only on high speed. Last month the blower switch quit working altogether. Almost seems like the switch is unplugged or maybe a bad fuse. Checked the fuse panel under the drivers side dash and looks OK. Yesterday, I pulled the blower resistor and looks OK on the coils, nothing broken, maybe too corroded. Wire brushed off the rust as best I could and tried to check continuity with multi meter. Not sure what I'm looking for.:jawdrop:
Ordered a replacement resistor because it's cheap and not rusty.
 

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From what I remember, a failing resistor will default to high. it appears that your resistor might have finally died completely.
Installing a new resistor is the first step. If that doesn't fix the issue, at last you have eliminated that particular part as the cause (assuming the new resistor is good).

I glanced at my Factory Service Manual, but didn't find how to test the resistor.
The other place to check is the blower switch on the heater control panel.

Good Luck, L.M.
 
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