This is since you replaced the blower resister? It sounds like an issue that was common on the WJ. For some reason the aftermarket blower motor resistors came wired incorrectly and two of the three wires in the blower motor plug were reversed leading to this issue. I haven't heard of that on this generation, but it sounds like the same issue. You might try swapping the wires around in the plug and seeing if you don't solve the problem.
2007 Red Rock Crystal Pearl Overland
- 2" Daystar lift - 245/75/17 Revo 2s - 1.5" Spidertrax Spacers -