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Old 01-24-2020, 02:39 AM   #3
Richard
Senior Member
 
Join Date: Dec 1999
Location: Southern California
Posts: 2,664
Re: 3500 overheating

You said you tested power to the fans, is there power there when engine is hot? If not check to see if it goes to ground. A lot of vehicle devices are switched to ground not to power. Power would be supplied on the non switched wire. Not really familiar with that truck. If the main fan is engine driven you may want to check out the fan clutch.
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Richard
1972 K10 Custom Deluxe SWB Fleetside
My build https://67-72chevytrucks.com/vboard/...d.php?t=800746
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