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AC Relay Identification/ Fan runs key off
Radiator fan works normally, but now and then once you take the key out, it turns on full. Fan module gets a key on signal from fuse 51 under hood. With the engine and PCM off somehow the module sees key on and no PCM signal, no PCM default is the runs 100%. ... Login to read more. 
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| Engine | 2.6 L |
| Trans | 5-speed Automatic (Electronic) |
Vehicle Data
2003 Mercedes-Benz C240 4Matic 2.6L
| Engine | 2.6 L |
| Trans | 5-speed Automatic (Electronic) |
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