over heating
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New User
Joined: Jul 2007
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over heating
hi i have a 1979 f150 with a 351m and it over heating i have replaced the themostat and it is still over heating. when i shut the truck off it shots a stream of coolant out the feller neck and make a bubbling sound if any one know how to fix please help me
oh and if anyone know how to set a 2brl carb and vacum line routing let me know i could use your help
oh and if anyone know how to set a 2brl carb and vacum line routing let me know i could use your help
Last edited by biggreen79; Jul 15, 2007 at 03:32 PM.
Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
Likes: 17
From: Hesperia, CA
There is not enough info to really help here.
It is normal for coolant to puke out when hot. That is why they have coolant recovery tanks on these vehicles.
Check the radiator to make sure the thing is not plugged. Check the bottom radiator hose to make sure it is not collapsing. Make sure you have a good working 15 lb cap on the radiator. Make sure the fan and fan clutch assembly are working properly. The fan clutch probably accounts for 80% of overheating problems.
It is normal for coolant to puke out when hot. That is why they have coolant recovery tanks on these vehicles.
Check the radiator to make sure the thing is not plugged. Check the bottom radiator hose to make sure it is not collapsing. Make sure you have a good working 15 lb cap on the radiator. Make sure the fan and fan clutch assembly are working properly. The fan clutch probably accounts for 80% of overheating problems.
Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
I had the same problem and it ended up being a plugged radiator. Grabbed one in the junkyard that looked to be a recent purchase in the truck it was in, and worked great.
But, like mentioned above, try your cap because if there isn't enough system pressure, the boiling point of your coolant drops dramatically. Also check that you have at least a good 50/50 mix of coolant/water.
My trucks came with flex fans instead of clutch fans, so there was no clutch to worry about.
Also, the waterpump may be losing efficiency.
But, like mentioned above, try your cap because if there isn't enough system pressure, the boiling point of your coolant drops dramatically. Also check that you have at least a good 50/50 mix of coolant/water.
My trucks came with flex fans instead of clutch fans, so there was no clutch to worry about.
Also, the waterpump may be losing efficiency.
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well guys bypassed the heat hoses and there is no clucth for the fan on this 79 it has a new cap the hoses are new coolant is flowin through the rad i thought maybe i have bad fin on the water pump it was cooling great untell i reved it upand then it started overheating
anyone know where i can find a vacum line diagram and factory carb settings
thanks for the help
anyone know where i can find a vacum line diagram and factory carb settings
thanks for the help
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New User
Joined: Jan 2008
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You never answered the coolant level Question I asked ;(
Vacuum diagrams ?
I have that info.
I'm waiting for all the info on your truck so I know which diagram to post.
so far:
1979 F150 351M
Trans auto or manual
4x2 or 4x4
49 state or California
Factory Carb settings ?
I haver that as well after you answer the above
Vacuum diagrams ?
I have that info.
I'm waiting for all the info on your truck so I know which diagram to post.
so far:
1979 F150 351M
Trans auto or manual
4x2 or 4x4
49 state or California
Factory Carb settings ?
I haver that as well after you answer the above
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Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
You could also have air in the system. Try parking with the front up a hill. When the engine is cool enough, remove cap and start. It should burp out the air if that was the problem, but give it some time (without boiling over!)
