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Guest Message by DevFuse

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Overheating, second verse


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4 replies to this topic

#1 OFFLINE   bradleyheathhays

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Posted 12 September 2018 - 03:41 PM

Sorry to start another thread but I'm desperate to get this fixed fast as it's really costing me not having this vehicle on the road now.

Got a '11 Crown Vic that's been overheating because the rad fan hasn't been kicking on when it should. I replaced the fan and fan controller with a new unit and it's still not working right. Sometimes the fan kicks on when I turn the a/c on, and other times it doesn't. Sometimes it turns on when the engine gets hot and sometimes it doesn't.

Water pump is known to be good, flushed system both ways and the thermostat is new.

Any ideas?









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#2 OFFLINE   akirby

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Posted 12 September 2018 - 03:48 PM

If you're in a pinch you could always hotwire the fans.



2018 F150 Supercab XLT Sport (Magnetic) - 3.5LEB
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#3 OFFLINE   fordtech1

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Posted 12 September 2018 - 04:03 PM

Do you have a way to check for codes in the pcm? See if there any cooling fan control codes. Check the connector at the fan for spread open pins especially the little wire. Load test the wires at fan connector. You can take a tail lamp bulb bend the tabs and stick it in the connector and load test it that way. Fuse 102 its a 50amp in the battery junction box is the feed. Make sure the fuse is good and not melted and the filament of the fuse isnt cracked.

#4 OFFLINE   twintornados

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Posted 13 September 2018 - 05:37 AM

I know this may sound simplistic, but did you check the temperature sending unit? It's gotta get the temperature reading from something.....


Edited by twintornados, 13 September 2018 - 05:38 AM.

Does anyone know where the love of god goes, when the waves turn the minutes to hours....Gordon Lightfoot, "Wreck of the Edmund Fitzgerald"

A government big enough to give you everything you want is a government big enough to take from you everything you have. ~ Gerald Ford - August 12, 1974

#5 OFFLINE   fordtech1

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Posted 13 September 2018 - 06:46 AM

I know this may sound simplistic, but did you check the temperature sending unit? It's gotta get the temperature reading from something.....


The pcm tells the fan to turn on from the cylinder head temp sensor. A scan tool would be the most useful thing to diagnose this concern. Otherwise you are just checking fan and circuits.
  • twintornados likes this








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