The Great Thermostat Debate [Merged]

[ebbfolls]

Speedyfix,

As Ezgrand has said, the thermoswitch is failsafe in that the circuitry is normally closed (n.c.) so that if it fails, it will lose ability to shut off the fan. I think all other cars are the same. If the fan is not constantly running, it should therefore mean that the thermoswitch is ok.

Ezgrand,

I think the main reason why the thermoswitch is separate from the thermostat is reliability. Both 'stat and 'switch are much more reliable being separate units than a universal thermostat/switch.

[jason7100]

are thermoswitch and thermofan one and the same?

[ebbfolls]

Yes. It is most appropriately called a thermofan switch. Thermo means it has something to do with heat, thus a fan switch that is heat activated.

[ebbfolls]

Yes. It is most appropriately called a thermic fan switch. Thermic means it has something to do with heat, thus a fan switch that is heat activated, or a thermo-fan switch.

[blkcoffee]

nung mag overheat kotse ko at dinala ko sa mekaniko, tingangal ng mekaniko yung thermostat. sabi niya, di raw kailangan yun. pang cold climates lang daw yun. At pag daw bumili ko bago nun, libo rin daw yun.
Tama ba mekaniko ko?

[alwayz_yummy]

sir,

my delica got the same treatment as your beacuse of the overheat..although its been found that its not the culprit..

somehow it affects because ung thermostat prevents water flow until such temp,tska lang sya magoopen to let the flow go..pero pag removed ung thermostat na yun,the water continually flows in the system while the engine is running..

hope this helps..

[niwde11]

nor ride mo sir? this is not good for newer engines.

[blkcoffee]

1992 galant mpi

[jojo_mouth2]

sa kotse mo na 92 model, i think it would be okey to removed the termostat by pass valve para continous na flow ng tubig. thou meron yan operating temperature every engine, dito sa pinas dali lang abotin yan kahit removed na yan thermostat by pass valve mo.

[mazdamazda]

here's you answer:

If it fails and sticks open, then it allows too much cool water into the engine and therefore the engine takes way too long to heat-up. This causes your car to get lousy gas mileage and makes your car's heater take forever to make hot air. In the short-run, this isn't bad for the engine, but over the long run (3 to 6 months) it can cause your engine to start burning oil and ruin your catalytic converter.

another one of those Filipino automotive myths...

[jojo_mouth2]

actually, taking off the termostat by pass valve is just a "band aid" solution to your problem. at 92 model engine, it might need to be overhauled.. as of the moment your mechanic has a solution to your overheating problem that doesnt solve the problem why it overheats...

[niwde11]

as what m2 quoted, long run ang effect nyan. every morning you need to rev it more para ma-attain nya kagad yung running temp ng engine mo. and one more thing, ecu na yan di ba so i think baka magkaproblema ka dyan(ecu will always think na malamig ang engine mo, thats what i know). para sakin, get a 2nd opinion or ask around mistu people about their experiences.

[JAYarc]

oo nga old myth:

sa totoo lang heat loss means power loss din, kaya normal operating temp keeps engine *optimum performance, especially modern engine with tigh gaps between metals..>>

[blkcoffee]

thanks guys. i am enlightened with your replies. I'll have a new thermostat reinstalled asap.
I did notice that it takes a long period of time for the engine to heat up. All along I thought that it's ok. Di pala.
Thanks again....very much

[lancevo8]

I guess, it depends sa year model ng oto mo., it will be better if u will not install your thermostat.,coz 92 model na unit mo. marami ng cause ng overheating nyan. might be your water pump, radiator ,and remember in phils.
our temperature are really extreme so madali talagang tumaas ang temperature ng kahit na oto. just my thought..

[vinj]

Just get a new one... Thermostat is relatively affordable.

[blkcoffee]

lancevo8,
right b4 the mechanic removed the thermostat, he checked all others first...the pump, radiator, hoses, radiator cap. He even had this apparatus placed in lieu of the radiator cap (i don't know what it does). All was in proper condition. That's when he thought that the thermostat maybe the culprit. It may have not opened when it was supposed to.
Anyways, ive decided to reinstall a new thermostat as per mr. mazdamazda's explanation.
thanks

[yebo]

and in fact removing the thermostats cuts the cooling capacity of your radiator in half! the thermostat regulates the flow of coolant between a by-pass port and the radiator. if the engine is cold then it is closed and the coolant goes to the by-pass. at maximum operating temperature it is fully open and 100% of the the coolant flow goes to the radiator. at temperatures in between "cold" and "optimum" it regulates the flow, dividing the flow of coolant between the by-pass and the radiator so that your engine runs at the most efficient temperature without overheating. if you remove the thermostats then the coolant flow is permanently divided between the by-pass port and the radiator, in effect cutting the cooling efficiency by 50%!

siguro stuck closed na yung thermostats mo kaya nago-overheat. nung tinanggal nya yung thermostat of course that puts back 50% of the cooling capacity kaya hindi na nago-overheat. but i guarantee you that if you get stuck in traffic on a hot summer day when you need 100% cooling efficiency from your radiator your engine will overheat!

[tarugs24]

Good decision bro, bottom line is di naman ilalagay yan ng car manufacturer kung di kailangan eh...

[jojoico]

I guess, it depends sa year model ng oto mo., it will be better if u will not install your thermostat.,coz 92 model na unit mo. marami ng cause ng overheating nyan. might be your water pump, radiator ,and remember in phils.
our temperature are really extreme so madali talagang tumaas ang temperature ng kahit na oto. just my thought..

ask ko lang din...ano ang difference/disadvantage kapag mas luma ang model ng kotse?
i have a Gen 1 crv kasi na nagoverheat last week, tinanggal din ng mechanic yun thermostat.

meron bang masisira na ibang engine components or ang disadvantage lang is matagal ma-reach ang normal operatin temp?