Head gasket?
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5th Wheeling
Joined: Feb 2011
Posts: 37
Likes: 5
Head gasket?
My 95 F-250 with a 7.5L keeps getting hot on me. Both at idle or highway speeds. I have a new aluminum radiator with electric fam conversion. I'm running a 160 degree thermostat. It seems to be moving coolant fine and there are no leaks. What makes me think it could be a head gasket is that if I start it cold without the radiator cap on within about 10 seconds it starts pushing coolant out of the neck. Also it looks like there are a bunch of tiny bubbles as well. Is there a good way to check for sure without any specialty tools? Or any other ideas would be great as well.
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5th Wheeling
Joined: Feb 2011
Posts: 37
Likes: 5
I put in a 160 to see if it would help it run cooler. It does not. It did the same thing with the mechanical fan. I decided to try out the electrical ones when I had to replace the original radiator. Neither change has made much difference.
Cargo Master
Joined: Mar 2010
Posts: 3,342
Likes: 294
From: Laramie, WY
You can check for hydrocarbons in the coolant. There are relatively cheap tools to do this. But this does sound like a leaking head gasket. You can also pressure test the coolant system. If I recall right they're supposed to hold 13 psi.
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5th Wheeling
Joined: Feb 2011
Posts: 37
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So I bought a combustion gas tester and it looks like I am getting exhaust in the cooling system. Guess I will have to quit hoping it was something else.
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5th Wheeling
Joined: Feb 2011
Posts: 37
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Well I decided to try and run some blue devil head gasket sealer through the cooling system and I am no longer getting exhaust in the system. However the truck is still getting hot, especially if the AC is running. Going down the highway it's sits on the L in normal. Once I get into town or stop it starts climbing higher. Without the AC on it rides on the M ay highway speeds.
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