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so a guy i know and I were talking today about KA's (since mine got messed up) and he said he took his thermostat out of his car, cause he heard (dunno where) that thermostat's are up there in the leading causes of KA's dying due to them not opening up.....Now i searched here and didnt find anything so I dont know if he's BS'n like typically or he actually knows what he's talking about.......Im pulling the engine and disassembling and wondering should i keep the thermostat or no? cause if it isnt there wont that just mean the car has constant coolant running through it no matter the temp?
 

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well the problem with not having a thermostat is yes you keep having coolant going through the motor that it doesnt properly heat up and get to its optimal temp which I think is around 190ish. What happens if your motor doesnt warm up is your ecu will keep the motor in start up mode, which will cause you to run richer causing the motor to run inefficiently. A thermostat is their for a reason Nissan and other manufacturers dont just add crap because they think its a cute thing to do.
 

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if your thermostats not opening up, get a new one. theyre pretty cheap. like the man said. theyre there for a reason.
 

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might be ok in TX or FL, but here in northern VA, my thermostat seal was slightly cracked and it would not warm up at all in the winter unless i really pushed it. Just a tiny crack.

and ya.. thermostats go from only 15-30 dollars. not expensive at all.
 

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my walbro isnt loud either, i can hear it prime when i start my car but thats about it....then again i have a loud ass exhaust.
 

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dont take your T stat out. like the man said nissan didnt put it there for nothing. if nissan didnt need to put one in they would leave it out, thats alot of saved $$ over thousands of cars.
 

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Altho i'm not against keeping the thermostat,but the main reason the thermostat is there is for your heater to work.I have removed mine but....i didnt just remove it,but i pluged the reirculating hoes from the throughtle body so that the water cant be by passed through the back of the thermostat.So now it only goes one way through the radiator.

Honestly i dont know what to say,it runs a little fresh,but i'm sure the engine was programmed to work with surtain temperatures all the time,so maybe it wasnt a good idea,but i tell ya my gauge is constantly on cold unless i park running for a while then it gets a little hotter.


Anyway..i guess my 2 cents didnt make any cense in this thread he he he :rotflmao
 

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240coupe are you refering to the coolant gauge on the cluster, if so that one is horrible, doesnt really give you a idea of the temp, and by the time the needle gets to the danger part its usually already too late and something bad happens. For just $40 you could get a water temp gauge and get a proper reading.
 

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pumaking said:
240coupe are you refering to the coolant gauge on the cluster, if so that one is horrible, doesnt really give you a idea of the temp, and by the time the needle gets to the danger part its usually already too late and something bad happens. For just $40 you could get a water temp gauge and get a proper reading.
sorry for a late reply

i was talking about the coolant lines that bypass the radiator when the engine is cold(thermostat is closed) ,when the thermostat is closed the water runs in the sircles in the engine bay,but when you remove the thermostat all together,your water goes every which way because now the path leads to 2 destinations,one is back in the engine,and the other is to the radiator.So its useless to take out the thurmostat without blocking the way back to the engine.

Look at the nissan service manual to get a better idea,even though its a little hard to understand it the way the pictured it.
 

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ok i need to clear something up here. try to listen cause it is hard for some people to understand and me to explain... it is not a good idea to run without a t-stat under any circumstances... people are right, it is there for a reason but not the reason given. the t-stat is to moderate water flow, which is important because of heat transfer. if you have no stat and you have water just going full tilt, it doesnt have time to absorb the heat of the engine. so even though your water temp is low your motor is still way hotter than it should be because the water cant absorb the heat the engine produces and then disipate it through the rad/heater core... so i hope that makes sense but it works both ways. a failing t-stat can cause overheating that you can register but no t-stat is an overheating issue that you will have no knowledge of until its too late. im sure that people will chime in sayins something along the lines of "i have ran without a t-stat for years with no adverse affects" but it is good cheap insurance for a well running cooling system.
 

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i was just wondering why i have to take my t-stat out for it to run with out it over heating. and i put a new head gasket on it after i took the head to get sand blastit and took it to a machinist to see if it was warp and it was find.but it still over heat unless i took the t-stat out. machanic told me it must be and my block but i don't won't to belive that. said owner before me put stock a leek in it and it leak though the head and got to the block. but i think that what they won't me belive. any ideal about that
 

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kevgsx99 said:
i was just wondering why i have to take my t-stat out for it to run with out it over heating. and i put a new head gasket on it after i took the head to get sand blastit and took it to a machinist to see if it was warp and it was find.but it still over heat unless i took the t-stat out. machanic told me it must be and my block but i don't won't to belive that. said owner before me put stock a leek in it and it leak though the head and got to the block. but i think that what they won't me belive. any ideal about that
What?
 

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the purpose of your thermostat is to allow proper heating/cooling of your engine. the thermostat must operate under direct liquid contact. when the engine is cold, the coolant is also cold, causing the t-stat to stay closed. while the t-stat is closed, coolant only circulates within the block. as combustion keeps occuring, heat is generated within the block. the coolant absorbs the heat from the cylinder walls, head, etc and starts to get warm. once the coolant gets to a certain temperature, the t-stat starts to open up allowing circulation to the radiator. if you remove your t-stat, your car will run richer during warm-up causing premature failure of certain things like your cat converter, spark plugs, carbon buildup behind valves.

bodysheild- when you friend says "the leading causes of KA's dying due to them not opening up", that just means that theyre stuck closed..replace the thermostat like your supposed to when its not working properly and it will fix that problem. id suggest putting the t-stat in, either way, it doesnt take that long to remove it anyway.

kevgsx99-you can tell whether your car is overheating due to a leak in the head/block by checking your coolant level. the reason why your car will not overheat when the t-stat is out is becuase the coolant is constantly being cooled in the radiator. if all the other stuff like yoru radiator, coolant hoses and watnot are good and your sure that its somewhere along the line of your t-stat then your overheating problem could simply be because there was air trapped between the coolant and t-stat. the t-stat will work properly only when it is in DIRECT contact with the liquid(in this case, the coolant). also you may have a stuck thermostat in which case, you can jsut replace it and your overheating problme would go away.
 

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great answers. Also think of it this way Nissan spent thousands of dollars on research for a T-Stat if Nissan and all the manufactures think its important than obviously it is. Its amazing such a small item that costs $7-$20 can make a difference in hundreds of dollars.
 

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running your engine cold for too long (no thermostat) can do lots of damage.
Also if you install an aftermarket water tem gauge with its own sensor you can see the point at which the thermo opens a lot easier than using the factory gauge.

To test a thermostat, put it in some cold water in a saucepan on the stove. When the water is hot enough you should see the thermo open. If it doesnt its broken
 
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