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My engine has about 4000 miles on it now in my 68 camaro. It drives good. Its just when I shut the engine off the temperature gauge keeps on rising. Lets say I turn off the engine at 160 degrees. The gauge climbs to all the way to 190 or 200. Whats goin on. The engine does not overheat. I also checked this problem with my hood up. When I shut the engine I can hear a lot of water rushing from somewhere. I must know what this problem is. Oh and when I start the engine back up the temperature goes back down. I would appreciate your help. Thanks
 

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I'm pretty sure this is normal, at least to a certain extent. When you turn off the engine, the coolant stops flowing immediately, and it's this action that causes the coolant to heat up a little before it actual starts to cool down, because the engine is still very hot. Maybe someone can explain it a little better than I can, but I don't think it's anything to worry about. 200 degrees won't crack a head or a block, you'd have to reach 230 or above for it to be a real problem. KZ

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John D. Smith
69' SS/396
www.geocities.com/kz1000ltd
 

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When your engine is running, you are measuring water temperature. The engine, when running, is always trying to heat up and the water in it is trying to keep it cool.
When you shut off the engine, the flow of water stops but the internal parts of the engine are still hot, especially the closer you get to the combustion chamber. The hot internal parts of the engine are now free to heat up the area where the temperature prob is located. This will cause a rise in LOCAL water temperature. When you re-start the engine, that heated water moves on past the area where the temperature prob is located and the circulating water will then re-cool that area.
The temperature fluxuation should be 15 - 20 degrees.
 

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Perfectly normal - don't worry, be happy!

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JohnZ
'69 Z28 Fathom Green
 
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