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This appears to be the auxillary fan relay. I am not sure without the letter or # under it. But at any rate, the relay could be getting hot because it is carrying a high load. That is what they are supposed to do. I would measure the current through the relay and compare it to the realy's load (30a). IF it is acceptable, You are OK>
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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