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Being that all the speeds do not work I would check the switch in the dash. I wouldn't be surprised if you found the connection on the back of the switch melted. The blower motor speed resister could be bad but generally when the resister goes bad you still have the high speed function.

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Q: On a 99 Jeep wrangler the fan blower doesn't work yet when you apply direct power to the motor it works. Is it the switch in the dash or is there a relay or something else causing the problem HELP win?
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