overheating problem...Clutch fan???
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Elder User
Joined: Oct 2016
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nope
Cargo Master
Joined: Oct 2012
Posts: 3,072
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From: California
I should have clarified in my original post....
With the engine OFF, use your hand to spin the fan blades. If it spins freely, then the clutch is bad. There should be a viscous-kind-of resistance to the spinning of fan clutch with the engine off.
Do not attempt to stop a fan clutch with the engine idling or running.
Fleet Mechanic
Joined: Oct 2012
Posts: 1,943
Likes: 21
Genscripter is right about the way the fan should feel when spun by hand.
The coolant should be being pumped regardless of pressure. If its not moving then it could be your water pump. I would recommend changing the thermostat since its cheap. If that doesn't fix it look at the water pump. I replaced my fan clutch when I did my water pump simply because you have to remove it to take out the water pump.
From reading it appears that the fan clutch does not lock until the 230ish range with the OverTemp light kicking on at 240*. Some have had luck testing their fan by blocking off the radiator and running the engine at high RPMs while parked. I tried this, but was never able to get the temps high enough. There is a procedure you can do to adjust the temp spring in the fan clutch to kick it in at a lower temp if you want. Also, make sure the fan clutch spring is clean. If it is covered in crud it will be insulated from the heat and delay it kicking in.
The coolant should be being pumped regardless of pressure. If its not moving then it could be your water pump. I would recommend changing the thermostat since its cheap. If that doesn't fix it look at the water pump. I replaced my fan clutch when I did my water pump simply because you have to remove it to take out the water pump.
From reading it appears that the fan clutch does not lock until the 230ish range with the OverTemp light kicking on at 240*. Some have had luck testing their fan by blocking off the radiator and running the engine at high RPMs while parked. I tried this, but was never able to get the temps high enough. There is a procedure you can do to adjust the temp spring in the fan clutch to kick it in at a lower temp if you want. Also, make sure the fan clutch spring is clean. If it is covered in crud it will be insulated from the heat and delay it kicking in.
Lead Driver
Joined: Apr 2008
Posts: 6,945
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Going to have to side with the t-stat crowd, or bad water pump. If the fan is doing ANYTHING at idle, it shouldnt get warm, unless you dont have a shroud. I also ran for a long time without a fan when it failed. Only time it would get warm was extended idling and pulling long hills, and thats with a very clogged radiator ( even with a fan it gets hot on the hills, just not as much lol)
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Rick_Fury
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Mar 16, 2012 07:20 PM
