Cooling question
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New User
Joined: Apr 2002
Posts: 16
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From: Bowling Green US
Cooling question
My dad has a 79 F100 wit ha 302. The 302 has headers, 4 brl intake, mild cam. C6 and 3.55 rearend gears.
Last summer it ran 200 degrees with the air on. This March it started running around 210 with the air unhooked. He makes a 50 mile trip to work everyday and on hot afternoons the truck gest 210-215.
This is not good. It hasn't boiled over yet but its got to be close.
In attempt to fix this we have changed the radiator, water pump, thermostat, carburator, plugs, rotor, distributor cap.
This one has us baffled. We have talked to the pro's and there baffled. Everything in our heads tells us it should run cool on the interstate and hot around town. But it runs hot on the interstate and 180 around town. We've ran out of ideas. The next thing to try will probably be swapping heads.
We didn't change anything before it started getting hot. This is a proven setup for 4 years. Never done this before. What would make one just start overheating like this?
Last summer it ran 200 degrees with the air on. This March it started running around 210 with the air unhooked. He makes a 50 mile trip to work everyday and on hot afternoons the truck gest 210-215.
This is not good. It hasn't boiled over yet but its got to be close.
In attempt to fix this we have changed the radiator, water pump, thermostat, carburator, plugs, rotor, distributor cap.
This one has us baffled. We have talked to the pro's and there baffled. Everything in our heads tells us it should run cool on the interstate and hot around town. But it runs hot on the interstate and 180 around town. We've ran out of ideas. The next thing to try will probably be swapping heads.
We didn't change anything before it started getting hot. This is a proven setup for 4 years. Never done this before. What would make one just start overheating like this?
Thread Starter
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New User
Joined: Apr 2002
Posts: 16
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From: Bowling Green US
Cooling question
Distributor does its thing. Fan is on correctly. We have narrowed it to a internal motor problem. Everything on the outside that pertains to cooling has eaither been replaced or checked out. This has been a working setup for 4 years without a hiccup. Nothing was changed until the problem started happening.
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Joined: Jan 2008
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Cooling question
Fan Shroud ?
Ratio of Coolant to Water ?
Try 60-40 water or 70-30 water
[font color=red]Dennis
Calgary,Alberta,Canada[/font]
[link:www.ford-trucks.com/guidelines.html|FTEModerator]
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Please Don't Ask Me Any Tough Questions,
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[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
[/font]
Ratio of Coolant to Water ?
Try 60-40 water or 70-30 water
[font color=red]Dennis
Calgary,Alberta,Canada[/font]
[link:www.ford-trucks.com/guidelines.html|FTEModerator]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
http://www.clubfte.com/users/mil1ion/Mil1ion.html
[font color=red]
Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
[/font]
Posting Guru
Joined: Jul 2001
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Likes: 1
Cooling question
This is a left field suggestion but put a vacuum gauge on it. If if moves alot at about 2500 rpm, you may have a cracked intake manifold. Had this happen on a 360 I had in one of my 74 F 100's. It cracked between the heat for the carb and the intake runner. At idle, no leakage detected and the truck idled fine. At speed, the heat went thru the roof but it still run good but not as strong as always. Dang near drove me nuts trying to find it.
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New User
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From: Bowling Green US
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Posting Guru
Joined: Jul 2001
Posts: 1,613
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From: Gainesville, FL
Cooling question
TT,
An often over looked source of heat is the automatic transmission. The C4 is often mated with the 302, not the C6. I had catastrophic overheats until i changed my fluid and filter. The tranny worked fine until it would overheat tragically at which time the tranny would slip. Changing the fluid and filter made all the difference.
Consider it.
KingFisher
An often over looked source of heat is the automatic transmission. The C4 is often mated with the 302, not the C6. I had catastrophic overheats until i changed my fluid and filter. The tranny worked fine until it would overheat tragically at which time the tranny would slip. Changing the fluid and filter made all the difference.
Consider it.
KingFisher
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