The resistor either works or it doesn't, I wouldn't care what it looks like. Check it, if its bad replace it. BTW, though the relay doesn't have anything to do with fan operation due to engine temp. It only is the mechanism for reduced speed on the low blower speed used when the AC pressure is high.

Of course if it worked properly for the AC the car probably wouldn't get hot.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician