Fan clutch
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New User
Joined: Feb 2021
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Fan clutch
My 07 f150 4.6 liter fan clutch engages when starting from cold and will disengage after it runs at idol for a few minutes. When I start it and run the defrosters to clear the windows the fan engages and will not disengage until the truck has cooled and I start it and let it idle then it will disengage. I have replaced temp sensors, fan clutch, water pump, thermostat, and drained the cooling system and flushed but still have not fixed the issue?????
Fleet Mechanic
Joined: Apr 2016
Posts: 1,653
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We are not sure if you have the electric clutch or the old style . At this point all I can say is make sure you have squeezed the top radiator hose to burp system of air .Replace reservoir cap as it is your pressure cap . I'm not sure what sensor controls an electric fan clutch . At idle i would expect fan to stay on and cutoff at speed . . Maybe your radiator is plugged .--low flow .I'm not clear on your symptoms.. your transmission is also cooled by your radiator .Make sure your belt tensioner has a lot of pressure as it drives your water pump -make sure all pulleys good .and belt routed correctly .
Cargo Master
Joined: Dec 2015
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My '11 F350 also runs the fan when cold and it's got the electric clutch (6.2 gas). It'll do it for the first 3 to 4 miles on cold mornings. It's a new Motorcraft clutch and fan blade I installed when I first got the truck, so I'm calling it normal.
I found it odd it'd run on cold starts, esp since if electric the PCM should theoretically have more control I'd think.
NOW I can't say I've ever seen it run on defrost -- makes me think your F150 is confusing the a/c clutch engaging with defrost as actual air conditioning demand
I found it odd it'd run on cold starts, esp since if electric the PCM should theoretically have more control I'd think.
NOW I can't say I've ever seen it run on defrost -- makes me think your F150 is confusing the a/c clutch engaging with defrost as actual air conditioning demand
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It is the old style fan. I have flushed coolant system and burped the coolant. Found a forum yesterday on the ac pressure relay. Unplugged the relay and solved the problem. Only to start truck this morning and fan is stuck and will not disengage.
Cargo Master
Joined: Dec 2015
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I'm very confused now
Fleet Mechanic
Joined: Apr 2016
Posts: 1,653
Likes: 193
Me too-- the old thermal clutch is only going to come on when it senses heat. Electric is another story . Are you sure you don't have wires going to your fan clutch . . you mat need to flow check your coolant ,possible its not circulating enough -plugged radiator or transmission running very hot heating up radiator .You need to do some temp checks .Another thing --is ac compressor starting to seize and making belt slip .or bad tensioner on belt .
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