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miran1981

Thermostat

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Dears,

 

I have dodge journey 2013 3.6v, I am from hot area,. can I change thermostat to lower Degree or  not ?,

 

I found this one, if capable for dodge journey not make problem ?

 

https://www.rippmods.com/collections/maintenance-replacement-parts/products/2012-2016-pentastar-180-deg-thermostat

 

your assistance is highly appreciated.

 

thanks

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On 4/25/2017 at 7:10 AM, larryl said:

Why not run it without a T-Stat?

 

From my experience running without one will cause it to over heat since the fluid never sit in one spot long enough for the fan to cool it.

 

So in other words all the antifreeze keeps building in temperature until it over heats where normally once it reaches it temp the thermostat opens cooling the engine until it reaches it's desired temp where it closes than cooling the antifreeze in the radiator and restarting the cycle. If i am wrong please correct me but to the best of my knowledge that is the general jist of how the coolant system works.

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6 hours ago, Locosiete said:

 

From my experience running without one will cause it to over heat since the fluid never sit in one spot long enough for the fan to cool it.

 

So in other words all the antifreeze keeps building in temperature until it over heats where normally once it reaches it temp the thermostat opens cooling the engine until it reaches it's desired temp where it closes than cooling the antifreeze in the radiator and restarting the cycle. If i am wrong please correct me but to the best of my knowledge that is the general jist of how the coolant system works.

Its the opposite.  Running without a thermostat, the cooling system is always open.  The cooling system works by circulating when the thermostat is open.  Circulating fluid takes heat from the engine and it gets cooled in the radiator.  The thermostat is closed when the engine is cold to prohibit circulation and allow the engine to warm up faster.  The thermostat will open at a predetermined temperature, begin circulation, and allow the cooling system to maintain that temperature.  Running without one just inhibits the engine from warming up quickly on initial start.  Keep in mind, a faulty thermostat that does not open will cause overheating because the fluid will never circulate through the engine.  

 

Peace.

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2 hours ago, redtomatoman said:

Its the opposite.  Running without a thermostat, the cooling system is always open.  The cooling system works by circulating when the thermostat is open.  Circulating fluid takes heat from the engine and it gets cooled in the radiator.  The thermostat is closed when the engine is cold to prohibit circulation and allow the engine to warm up faster.  The thermostat will open at a predetermined temperature, begin circulation, and allow the cooling system to maintain that temperature.  Running without one just inhibits the engine from warming up quickly on initial start.  Keep in mind, a faulty thermostat that does not open will cause overheating because the fluid will never circulate through the engine.  

 

Peace.

You may want to check your facts on that. The fluid doesn't instantly cool when it reaches the radiator. Which is why the thermostat when closed will hold it to allow the air blowing threw it along with the fan to cool it. 

example: you take a red hot pan off the stove and run it quickly under water then put it back on the hot stove. Would it be any cooler. Nope!!

Plus i have run a car without one and it overheated. Used your logic and learned a quick lesson. It doesn't over heat right away like when the thermostat is closed but never the less it did.

 

Some Race cars run without one cause they only run for a couple minutes at a time. 

I've seen many overheat at the line cause other lane takes too long to stage.

 

All i can say is pull yours out and go for a drive for an hour. Than tell me it doesn't overheat in the summer.

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so you are saying the purpose of the thermostat is to cool also??

I learned something new today I guess always thought it was to quickly help get the engine temp. up to a pre determined level to activate sensors and provide heat to the cabin.

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As far as I know a you can run with without/faulty thermostat as they fail open so it doesn't cook your engine. A good sign of a faulty stat is when engine temperature get up turn on your cabin heater and the temp will start to drop.

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1 hour ago, Junior102 said:

As far as I know a you can run with without/faulty thermostat as they fail open so it doesn't cook your engine. A good sign of a faulty stat is when engine temperature get up turn on your cabin heater and the temp will start to drop.

You are also correct. In the winter it wont warm up a small car. But summertime is a while other story. There are some other variables like sitting in traffic vs driving down highway on how much it will impact you.

 

Otherwise car manufacturers wouldn't spend a penny on researching what is optimal temp to have thermostat respond. 

Edited by Locosiete
Typo

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Ok.  I'm not a mechanic.  Just sayin.  

BUT. . .  

Junior102 is correct.  A thermostat regulates the flow of coolant through the engine and radiator.  A faulty thermostat condition depends on whether it is stuck open or closed.  A stuck open thermostat will allow coolant to circulate through the radiator and the engine will not overheat (assuming all other cooling components are working).  A stuck open thermostat will not allow quick engine warmup.   A thermostat stuck closed will cause engine overheating as the coolant WILL NOT be able to flow through the radiator and engine.  When an engine is cold the thermostat will be closed.   When an engine is at operating temperature the thermostat will be open.  That's basic engine cooling 101.  

 

Peace. 

 

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Correct if it's stuck open it will continuously circulate the fluid. But on a hot day of stop and go traffic it will over heat. It does take much longer than if it was stuck closed but the results are still the same in the end.

 

Thermostat helps regulate the temp.

Edited by Locosiete

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i guess no one understands how the thermostat works lol. if its stuck open or removed, the engine will never overheat. on a hot day once operating temp is reached the thermostat will not close again until the engine is shut off. if its during winter the thermostat may close while driving due to so much cold air on the radiator.
also once the coolant passes through the radiator there is a significant drop in temp as it passes through especially with the cooling fans on.

 

Changing the thermostat to a lower opening temp will be fine, usually around 180 is good. The entire purpose of the thermostat is for quick warm up to operating temp and that is it, nothing more.

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If your car overheats and you have no thermostat you either have circulation ie (plugged rad, defective water pump) or cooling fan problems.

 

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