cooling system pressure?
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Senior User
Joined: Jul 2007
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cooling system pressure?
I Have had this on going problem with pressure building in the cooling system. I only drive the truck during the summer months and I have a process i have to do every time I drive it. morning pop the hood, flip the pressure lever on my radiator cap to pressurize system drive to work, cools fine, overflows into overflow, pulls back in when cooling. Sits at my work 10-11 hours no problem. Drive home, go eat dinner. Have to make sure to go outside and relieve pressure and leave that way, if I don't by morning there is so much pressure i have antifreeze leaking out of all my hoses. haven't started truck in couple months. popped hood looking at stuff,etc. accidentally flipped pressure release on cap (to pressurize)and by morning I noticed antifreeze all over ground. had to release pressure and leave cap loose. right now temp 30-35 morning 45-50 afternoon. will 10-15 degrees change the pressure in your cooling system that much. I guess my question is what the heck is going on? sorry for the long story. any help would be awesome, thanks
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
If I understand your post, you likely have a leaking head gasket. As the engine runs, exhaust gasses are leaking past the head gasket and entering the cooling jacket, thereby pressurizing the cooling system.
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Senior User
Joined: Jul 2007
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the only thing is I havent started the truck in two months and like I said I had already had the cap loose for that time. I went out one afternoon to pop the hood and thought to myself theres no way it is going to build pressure after sitting that long. pressurized the cap and next day leaking. I didnt start it, I dont have a gas tank in it. Thats my project for this week end. new gas tank,sender, hoses etc. Ya the I beams are still intact, no problems, I was wondering if someone was going to ask me that. And with that o2 senor I installed the old edelbrock runs perfect now no hesitation and burn out threw all 3 gears. I might throw a new head gasket on. I have to take the intake and exhaust off because one of the freeze plugs has a small leak. should port and polish head but dont think I have patients for that. might just run it till it blows. got a dual Quad side oiler 427 sitting in my garage(my dads) but I think he would miss it. thanks guys
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