cooling problems
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New User
Joined: Dec 2003
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cooling problems
I have a 69 f100 with 390/c6. I bought the truck in already running; therefore, I do not know whats inside the engine. It has a elderbrock manifold and mallory elect. ignition. The problem is with a thermastat installed it builds up pressure swelling the upper hose. Once it burst radiator, I replaced it and all the hoses installed a fan shroud and then the heater core burst. The truck runs fine with no thermastat, with the 190 degree it runs warm and is hard to start after driving awhile, it also clatters when shutting it off. With the 160 degree it runs fine but does not get hot enough to provide heat. I have not tried a 180 degree thermastat but with any thermastat it builds pressure. Any help will be greatly appreciated.
Post Fiend
Joined: Jan 1997
Posts: 23,165
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From: Enjoying the real world.
Sounds like they're backwards to me. There should be no problems with over-pressure if its properly installed. If your truck isn't running correctly, or running too hot with a standard thermostat you have a fuel system problem.
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New User
Joined: Dec 2003
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I made sure that the tstat. was installed correctly. This is the 2nd 69 with a 390 that i've had. Yes, I do have a fuel problem, the fuel tank has rust inside I cleaned it with muratic acid but the rust has come back. I need to have it sealed, I think.
Senior User
Joined: Sep 2003
Posts: 238
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From: Bridgeville,CA
I agree about the radiator cap. If it was popping at the right temp then you should not swell the hoses etc even if the engine was overheating. You would just blow coolent overboard. It may be a combination of thermostat and cap.
Elder User
Joined: Mar 2002
Posts: 609
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From: Watauga TEXAS
It sounds to me like you have a blown head gasket. Even with the t-stat installed backwards (if it was) it still wouldn't build enough pressure to start blowing hoses and heater cores.
Start with a cold engine and remove the radiator cap. Make sure the radiator is filled to the top. Start the engine and look for bubbles coming up to the radiator filler neck.
Good Luck-
Joe
Start with a cold engine and remove the radiator cap. Make sure the radiator is filled to the top. Start the engine and look for bubbles coming up to the radiator filler neck.
Good Luck-
Joe
