Overheating.... w/ no Thermostat

[ZOMG.SR20]

The answer is simple. It's summer time and you have not fed your motor ice cream!

Try that first!

im going to do that and The CTS was replaced

[hilux30]

take the cylinder head off and put dry ice on the pistons, it works everytime, you just have to do it every 5 minutes or so.....

[guyaverage]

...he was only stating that if everything works properly on your car and you dont run a thermostat....its impossible to overheat....and he is correct.

Impossible?.......Well, thats wrong.

The t-stat used in this engine has an "umbrella" (the round flat part on the end) that diverts flow from the block into the radiator when the t-stat is open. Even with the t-stat fully open, without that umbrella, only a small portion of the coolant flow makes it through the radiator, because once the t-stat is opened both cooling circuits (through the radiator, or directly back to the block) would be open. Without the forced diversion to the radiator, the cooling system is working at a fraction of its usable capacity. Is some climates you can get away with it. Others you cant. But so say its impossible is just plain wrong. I have seen it dozens of times.

I work on boats on the side, and at several model Mercruiser engines use t-stats with umbrellas. When people substitute a non-umbrella'd automotive t-stat in its place, even with one the same temperature, its an almost guaranteed overheat once you get above idle.

Having proper restriction to get proper speed of coolant flow is important too. Too small, it overheats from lack of flow. No restriction, coolant flows too fast and while the temperature gauge shows normal, the engine itself (head, cylinder walls, etc) may be way over temp. You shut the engine off, and a minute later, when the coolant is absorbing heat from the overheated parts, you get a boilover.

The thermostat controls the operating temperature. If you are overheating with it in, you either have-

-a bad thermostat-plugged radiator-bad water pump-cooling airflow restriction-blow head gasket

If your thermostat is operating the way it should, and you have to remove it to keep the engine from overheating, then all you did is mask a symptom, you havent solved the real problem.

[ZOMG.SR20]

DOES NO ONE READ THE THERMOSTAT THAT WAS IN IT WAS STUCK SHUT omg so i took it out

[spooled240]

so what is your question? you know your thermostat is stuck shut, you need a thermostat to regulate the flow of coolant through the radiator....GET ANOTHER THERMOSTAT

[ZOMG.SR20]

close this thread i fixed the problem