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360FE overheated

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Old May 8, 2025 | 02:01 PM
  #1  
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360FE overheated

This is a new one!
1975 F100 with 360FE.. I was driving and the truck overheated and blew water/prestone everywhere. I opened the hood expecting a blown hose, or hole in the rad etc. Nothing!
After we got it to the shop,, investigated some more,, we were down to a stuck thermostat. As i took off the thermostat housing, we found the thermostat went past the gasket and fell into the front of the intake. How could this possibly make the truck overheat?
I bought a new thermostat (even though the old one seemed fine) and made a stainless plate so it couldn't fall backwards into the intake again. It seemed the gasket was the only thing holding it in place.
Anyone ever had this problem? seems very odd to me
 
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Old May 8, 2025 | 05:44 PM
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Try asking down on the FE engine forum. You shouldn't have to make a backing plate for the t-stat.
 
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Old May 8, 2025 | 06:01 PM
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Agreed with above, I don't think the t-stat should just fall into the intake. I am thinking wrong t-stat or there is some severe corrosion on the intake.

How old is the radiator cap? Know anyone with a cap tester? Maybe it is not holding pressure like it is supposed to causing it to boil over?
 
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Old May 8, 2025 | 06:47 PM
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if you have the correct thermostat it cannot fit through the hole to fall inside.

 
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Old May 9, 2025 | 06:11 AM
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73 f250 cs 2w. 360

So ballpark, how long does a TStat usually last?
 
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Old May 9, 2025 | 08:17 AM
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I have some that are over 30 years old.

On a daily driver a minimum of 5 years. usually far more.
 
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Old May 9, 2025 | 11:02 AM
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Thank you. Truck has 45k on it. Seems to be original TStat if that is even possible…
 
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Old May 9, 2025 | 03:45 PM
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I've had original thermostats on late 1940's era flathead v8 (those have two) still work.

Yes, modern ones do fail had plenty of those fail. But they should never fall through the hole. It sounds like the wrong one.
 
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