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Is It Good To Remove Thermostat To Stop Overheating? - Car Talk - Nairaland

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Is It Good To Remove Thermostat To Stop Overheating? by elitper: 6:40am On May 14, 2010
Dear Nlanders, just took delivery of 1996 camry. The car is good except that it is overheating. I am divided between those who say I should yank off the thermostat and those who think I should change the radiator altogether. A couple of people also feel I should just give the radiator a good wash. Wise ones, please help.
Re: Is It Good To Remove Thermostat To Stop Overheating? by Siena(m): 6:56am On May 14, 2010
Removing the thermostat from any car isn't a good idea. It simply masks an underlying issue. Have the system pressure tested - an overheating engine could be caused by a myriad of problems - blown head gasket, cracked cylinder head / block, thermostat stuck in the shut position, a clogged radiator, inoperative cooling fan or even the wrong fuel / spark plug grade.

Removing the thermostat will simply make the engine over cool, which is bad. It will increase fuel consumption, as the engine CTS (coolant temperature sensor) will assume the engine's not up to normal operating temperature, and simply inject more fuel in. This will cause premature engine wear, as the excess fuel will wash the oil from the cylinder bores (bore wash).

Get your car checked by a competent engineer, and I don't mean the masquerades by the roadside, who don't know one end of a spanner from the other. Best of luck.
Re: Is It Good To Remove Thermostat To Stop Overheating? by german007(m): 7:07am On May 14, 2010
Siena:

Removing the thermostat from any car isn't a good idea. It simply masks an underlying issue. Have the system pressure tested - an overheating engine could be caused by a myriad of problems - blown head gasket, cracked cylinder head / block, thermostat stuck in the shut position, a clogged radiator, inoperative cooling fan or even the wrong fuel / spark plug grade.

Removing the thermostat will simply make the engine over cool, which is bad. It will increase fuel consumption, as the engine CTS (coolant temperature sensor) will assume the engine's not up to normal operating temperature, and simply inject more fuel in. This will cause premature engine wear, as the excess fuel will wash the oil from the cylinder bores (bore wash).

Get your car checked by a competent engineer, and I don't mean the masquerades by the roadside, who don't know one end of a spanner from the other. Best of luck.


Matey, You are tooooo good. You certainly know your onions.

No fellow can take that away from you.

About time you should really look into "Siena Autocentre Nigeria"  wink   wink
Re: Is It Good To Remove Thermostat To Stop Overheating? by elitper: 7:19am On May 14, 2010
@Siena, I am grateful and proud of you. Will try to clean up the radiator at the car wash first. If the problem persists, I will look for a competent mechanic as you advised.
Re: Is It Good To Remove Thermostat To Stop Overheating? by VV2A(m): 8:22pm On May 14, 2010
@German

You had a different perspective here

http://www.nairaland.com/nigeria/topic-417568.64.html

Clarify pls. Thank you
Re: Is It Good To Remove Thermostat To Stop Overheating? by Fhemmmy: 9:29pm On May 14, 2010
Very Bad idea.
Check what is wrong and fix in a proper way.

Good luck
Re: Is It Good To Remove Thermostat To Stop Overheating? by german007(m): 10:09pm On May 14, 2010
VV2A:

@German

You had a different perspective here

http://www.nairaland.com/nigeria/topic-417568.64.html

Clarify pls. Thank you

There is nothing or need to clarify.

My Perspective on my thread has'nt been solely defined as a wrong practice.

Removing the thermostat is clearly a common practice all over the world, Because something is a common practise, does'nt mean it is correct and vice versa does'nt mean it is wrong.

Sienna, A fully qualified auto professional has clearly enlightened us collectively,  my not conflicting with Sienna and concuring with what he's said clearly reflects my positive acknowledgement with his advice.

Life is a learning curve, new ideas, techiques and philosophy's are imbibed and inculcated each day.

Thanks.
Re: Is It Good To Remove Thermostat To Stop Overheating? by dsunmade: 8:28am On Feb 24, 2012
I use a Toyota Avensis 1998 model imported from Iceland. A mechanic had the thermostat removed about 1 year ago. I however noticed that anytime it rains and water splashes on the underside of the car, the engine splutters. It actually stalled on 1 day and the engine over flooded. What do I do? Siena and others, pls help out
Re: Is It Good To Remove Thermostat To Stop Overheating? by FPoints: 11:37pm On Feb 24, 2012
@dsumnade

I would reinstall the thermostat, then service the radiator, by flushing and adding some additives which seal radiator leaks.

The mechanics in naija, for the most part are illiterates and often times, take things out of cars saying things like ' the car doesn't need it'. Why did the car manufacturer install the part? Things that make you wonder.

Please don't let any mechanic take out parts from your cars!
Re: Is It Good To Remove Thermostat To Stop Overheating? by beizboi: 11:08pm On Mar 07, 2013
After reading this thread i checked my car, honda accord 94 ('bullet') 2.0 le, and realized my thermostat had been removed. I've been unable to find a place to buy one in benue so far. And i also realized my fans both start turning once i turn on the ignition. sadAfter reading this thread i checked my car, honda accord 94 ('bullet') 2.0 le, and realized my thermostat had been removed. I've been unable to find a place to buy one in benue so far. And i also realized my fans both start turning once i turn on the ignition.
Re: Is It Good To Remove Thermostat To Stop Overheating? by car-doctor: 5:30am On Mar 08, 2013
elitper: Dear Nlanders, just took delivery of 1996 camry. The car is good except that it is overheating. I am divided between those who say I should yank off the thermostat and those who think I should change the radiator altogether. A couple of people also feel I should just give the radiator a good wash. Wise ones, please help.


If you are talking about the cooling system "radiator" thermostat, don't even think about removing it. Contrary to popular myth, the thermostat sets the minimum temperature that the engine operates at, not the maximum. The maximum operating temperature is a function of engine ouput (load) and how well designed and maintained the cooling system is. On almost all modern cars, the cooling system has plenty of "overhead" to manage heat disipation under even the worst conditions. This is a direct result of the heat/cold driving cycle testing requirments for modern emission controlled engines.

If you remove the thermostat, the engine will run at a variable temperature and on a modern car this is usually too cold because of the large cooling capacities. This temperature is unlikely to be that which is required for proper operation of the engine management system. The end result of this is likely to be radically increased fuel consumption because of the Automatic Choke staying open for longer periods while it waits for the engine to fully warm up, greater emissions, and the setting of MIL or CEL "fault" conditions in the ECU. If the system runs rich for a long period of time, it can also cause a pehenomenon known as cylinder oil scrubbing in which the rich fuel/air mixture "scrubs" the oil off of the cylinder walls, resulting in premature piston/ring/cylinder wear and engine failure.

If you are experiencing high temps, change the thermostat, as it may not be opening all the way or may be stuck in a partially open position causing the high temps. Also carry out a coolant pressure test and check if your cooling fans are working properly.
Re: Is It Good To Remove Thermostat To Stop Overheating? by honmusa: 12:14pm On Mar 10, 2013
hello all,
I need to replace my thermostat cos my vehicle(Nissan Primera p11 1.8 engine ) is overcool and fuel consumption is high(average of 30L/100km) ,and all the mechanics and part dealer i have try to get this from are unable to get one for m
Re: Is It Good To Remove Thermostat To Stop Overheating? by kenneth.se: 3:05pm On Jul 01, 2013
Dear Nlander, I live in the caribbean and I was advised by my machinic to remove my thermostst because of the climate, he says thermostats were designed only for temperate countries.
Re: Is It Good To Remove Thermostat To Stop Overheating? by ZIM DRILL(m): 3:53pm On Jul 01, 2013
kenneth.se:
Dear Nlander, I live in the caribbean and I was advised by my machinic to remove my thermostst because of the climate, he says thermostats were designed only for temperate countries.

change your mechanic
Re: Is It Good To Remove Thermostat To Stop Overheating? by Joshcoli(m): 1:25pm On Oct 14, 2013
kenneth.se:
Dear Nlander, I live in the caribbean and I was advised by my machinic to remove my thermostst because of the climate, he says thermostats were designed only for temperate countries.

Exactly what my mechanic told me too
Re: Is It Good To Remove Thermostat To Stop Overheating? by mastro: 11:19am On Oct 17, 2013
Joshcoli:

Exactly what my mechanic told me too

Your Mecho is another roadside monkey, change your mechanic, or will he claim that cars in Southern USA (Texas, Florida etc) have their thermostats removed. Really it's like we are talking to ourselves in here.

The people who designed and built the car put a thermostat in it, they test their cars in the hottest and coldest climates on earth, the cars leave the factories with thermostats. Baba roadside says remove it, that the Oyingbo's don't know anything, come on guys, who is more qualified to make that decision, The builders and designers or the roadside mecho?

DO NOT REMOVE YOUR THERMOSTATS !!!!!!!!!!!!!!!!
Re: Is It Good To Remove Thermostat To Stop Overheating? by Nobody: 5:22pm On Oct 17, 2013
http://www.cartalk.com/content/you-should-never-ever-remove-thermostat

The thermostat is just a valve that goes between the engine and the radiator. It's purpose is to keep the engine at the proper operating temperature. When the engine gets too hot, the thermostat opens up and lets the engine coolant flow through the radiator, where it cools off. When the engine is too cool, the thermostat closes and stops the coolant from flowing through the radiator, so the engine heats back up.

But taking out the thermostat can actually do quite a bit of damage on a modern car. Most cars now have computers, which constantly monitor the engine temperature and adjust things accordingly. If the computer thinks the engine is cold--and it WILL be cold without a thermostat--it'll richen the fuel mixture. That will lead to poor mileage, carbon buildup, and eventually, a $400 repair bill for a new catalytic converter.
Re: Is It Good To Remove Thermostat To Stop Overheating? by Nobody: 5:23pm On Oct 17, 2013
kenneth.se:
Dear Nlander, I live in the caribbean and I was advised by my machinic to remove my thermostst because of the climate, he says thermostats were designed only for temperate countries.

How ridiculous!
Re: Is It Good To Remove Thermostat To Stop Overheating? by Nobody: 11:50am On Oct 18, 2013
kenneth.se:
Dear Nlander, I live in the caribbean and I was advised by my machinic to remove my thermostst because of the climate, he says thermostats were designed only for temperate countries.


Is your Mechanic a Nigerian? grin
Re: Is It Good To Remove Thermostat To Stop Overheating? by ciwi: 2:19pm On Oct 22, 2013
@ Joshcoli, please I sent you a pm. Please can u reply? I wanna find out something important from you
Re: Is It Good To Remove Thermostat To Stop Overheating? by erico2k2(m): 6:13pm On Oct 23, 2013
honmusa: hello all,
I need to replace my thermostat cos my vehicle(Nissan Primera p11 1.8 engine ) is overcool and fuel consumption is high(average of 30L/100km) ,and all the mechanics and part dealer i have try to get this from are unable to get one for m
Run an OBD scbn,the usual suspects r the O2 sensors.

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