The Great Thermostat Debate [Merged]

[oh_arnold]

Originally posted by jason7100
if this is the case... what is the function of the thermostat? isnt this the one which turns on the fan? thanks!

ehehe. sa tingin ko ang tinutukoy ng original poster ay yung thermostat that blocks/unblocks the coolant flow. tinatanggal ito para palaging nagflo-flow yung coolant to the radiator.

on the other hand, yung mga hindi belt-driven fans ay ino-off/on din ng isa pang thermostat. yung iba wina-wire directly yung motor ng fan, bypassing this thermostat/switch para palaging naka-on.

[a3n3as]

sa akin tinanggal na rin ang thermostat.

[jick.cejoco]

sa akin tinanggal na rin ang thermostat.

moderator,
please repost the dirty dozen reasons why you do not remove the thermostat from the car's liquid cooling system. it was written by me for the honda thread sometime last month.
jick
certified auto
guam

[jick.cejoco]

moderator,
please repost the dirty dozen reasons why you do not remove the thermostat from the car's liquid cooling system. it was written by me for the honda thread sometime last month.
jick
certified auto
guam

gentlemen,
i found the previous thread for this post. it was dated 5/17/09 at 0754 manila time found at the honda car threads. hope this will enlighten those who were not able to read and understand. thanks for repost
jick

[kideex]

just take note of the engine as the heart of the car, heart have valves going in and out and taking it off is very very bad...really for sure (human circulatory system)...for cars applies the same. eventually engine's life will be shortened if high temp. are neglected...

[mark_t]

sa akin tinanggal na rin ang thermostat.

Be ready to pay more for fuel.

[white hotrod]

don't remove thermostat valve.part ng engine design kc yan.use genuine part only para iwas abala.

[jick.cejoco]

don't remove thermostat valve.part ng engine design kc yan.use genuine part only para iwas abala.

white hotrod,
i see you changed from advising people to remove their thermostat since the Peelipins is a tropical country. even i the kalahari desert or in saudi arabia, the thermostat is needed. go figure. in engineering there is a subject called thermodynamics, i wonder why engineers waste their time on this. or are they wasting their time?
jick

[mark_t]

white hotrod,
i see you changed from advising people to remove their thermostat since the Peelipins is a tropical country. even i the kalahari desert or in saudi arabia, the thermostat is needed. go figure. in engineering there is a subject called thermodynamics, i wonder why engineers waste their time on this. or are they wasting their time?
jick

The world is a better place now that he share our best limited judgement.

[mark_t]

white hotrod,
i see you changed from advising people to remove their thermostat since the Peelipins is a tropical country. even i the kalahari desert or in saudi arabia, the thermostat is needed. go figure. in engineering there is a subject called thermodynamics, i wonder why engineers waste their time on this. or are they wasting their time?
jick

He he.. Differential equations ang pre requisite ng subject na thermodynamics dito sa Philippines.

And Differential Calculus and Integral Calculus naman pre requisite ng Differential equations

Kaya marami makulit na mechanics daw sila.

Take your money and run.

[aeronuts2005]

Sir help din po...

Newbie here and first time na car owner... kahit na old model e iba talga ang sarili diba at ingat na ingat ka? ang problem ko po is that when i switch on my car (engine off ) e andar na agad ang FAN as in nakarekta,.. now i believe that thermostat and a themoswitch are needed as it is part of the engine cooling system 's component... How would i revert it back sa original na with thermostat at thermo switch?

my car is 1996 Mitsubishi Lancer EL at kahit na luma e iba talaga pag me ingat na ingat ka sa car mo. I want to install a new thermo switch at thermostat... Anno po ba recommended nyo na thermo switch sa lancer EL at thermostat na rin?

Please help and regards!

Jay

[ebbfolls]

Originally posted by jason7100
if this is the case... what is the function of the thermostat? isnt this the one which turns on the fan? thanks!

To be honest, I am not sure why the fan shouldnt be operated by the thermostat. But I speak from experience and I tell you that you can remove the thermostat and the fan will still cycle on and off based on coolant temperature sensed by the fan switch. As somebody else has already said, I was referring to the thermostat that controls the flow of the coolant between the engine block and the radiator.

I shall look more into this. If I find a better answer to your question ill get right back to it.

[jason7100]

ebbfols,

thank you! so there are two thermostats operating... one for the control of the coolant flow and one for the fan... I asked coz my car keeps overheating! and just a 78km run from laguna to makati. I had it checked before and the mechanic said the thermostat is missing... But I assume this one is the one controlling the flow coz he removed the tube connecting the engine and poked it with his screw driver... having found that the screw driver was unobstructed by his methodical poking procedures, he concluded... it was removed. now im afraid i have to replace both! =(

Do you know where I could have this fixed aside from the CASA?

[ezgrand]

Hello. Istarted the thread and was talking about the thermostat usually located in a water outlet on top of the engine by the upper hose.

The other one is the THERMOFAN switch usually attached to the radiator and is used to turn the fan on and off on FWD cars.


Madaming nagoverheat dahil dyan sa thermofan switch and is often overlooked as a cause of overheating. MAganda ginawa ng Mazda yata? Pag nasira ang switch, always on ang fan(failsafe) binaliktad lang nila ang wiring, unlike other manufacturers always off pag nasira anf switch. Makes you wonder why they didn't copy Mazda on this simple solution...Pride?

[ebbfolls]

Ezgrand,
Actually, the Corolla has the same failsafe feature, and I think most if not all cars are the same. Is there a particular model you noticed does not have this feature? I still dont understand why the thermostat should not handle both duties of controlling coolant flow and fan operation. The only reason I can think of is that the fan switch monitors the coolant in the radiator while the thermostat monitors the coolant in the engine. This way the fan does not turn on until the coolant from the engine enters the radiator. But it still sounds a bit redundant to me.

[speedyfix]

thermostat and thermoswitch are 2 different things.

it's best to have both installed and working properly to ensure that the car doesn't overheat

[morrissey_05]

sa kabilang forum, there are two guys making the case for removing the thermostat. hehehe

[OTEP]

Wala bang link? hehehe.

O kaya i-link mo sila dito.

[cengrtecs]

Agree ako kay Speedyfix. Wag nyong tatanggalin pareho. Kaya lang both should be on their proper specs. Yung Thermostat sa ibabaw ng makina, nag activate yun pag umiinit , lumalamig makina , ang alam ko may wax sa loob yun or any material na nag eexpand para bumukas at sumara. Yung thermoswitch, there is a certain temperature na mag on sya, thus connected to a relay or direct to radiator fan. Malaki epekto nyan sa performance at longevity ng makina, maski gaanong kalaking makina.

Sabi nila pag sa Pilipinas, di na kailangan dahil mainit ang panahon. Kapag summer dito sa Japan mas mainit pa kaysa dyan sa atin, bakit di naman ginagalaw ng mga Ponjaps yan. Takbo nga lang ng takbo sila.

Regarding sa kung saan bibili ng thermostat for a certain car para masiguro kung tama, yun ang problema, parang takip ng radiator, para makasiguro ako, dito ako sa Japan bumibili. Sa casa meron nyan, medyo mahal siguro.

Domo arigato gozaimasuta!

[lhandzs]

Info about thermostat.

The thermostat's main job is to allow the engine to heat up quickly, and then to keep the engine at a constant temperature. It does this by regulating the amount of water that goes through the radiator. At low temperatures, the outlet to the radiator is completely blocked -- all of the coolant is recirculated back through the engine.

Once the temperature of the coolant rises to between 180 and 195 F (82 - 91 C), the thermostat starts to open, allowing fluid to flow through the radiator. By the time the coolant reaches 200 to 218 F (93 - 103 C), the thermostat is open all the way.


If you ever have the chance to test one, a thermostat is an amazing thing to watch because what it does seems impossible. You can put one in a pot of boiling water on the stove. As it heats up, its valve opens about an inch, apparently by magic! If you'd like to try this yourself, go to a car parts store and buy one for a couple of bucks.

The secret of the thermostat lies in the small cylinder located on the engine-side of the device. This cylinder is filled with a wax that begins to melt at around 180 F (different thermostats open at different temperatures, but 180 F is a common one). A rod connected to the valve presses into this wax. When the wax melts, it expands significantly, pushing the rod out of the cylinder and opening the valve. The wax just expands a good bit more because it is changing from a solid to a liquid in addition to expanding from the heat.