Radiator's Unusual Loss of Coolant

[JohnM]

OT: According to my source, pwede ng hindi lagyan ng thermostat yung mga auto dito sa Pilipinas. Is it true?
Lagi kasi lumalabas yung warning light ko na "H" and sabi nung siraniko na kakilala ko, palitan ko na daw thermostat, sabi naman nung auto supply, pwede na kahit wala. Please advise.

Has been discussed before. Basically a bad idea to remove the thermostat. Takes longer to warm up so increases fuel consumption on cold starts. Risk of overheat at high revs because the coolant is traveling too fast through the radiator giving it no chance to vent its heat.

[testament11]

OT: According to my source, pwede ng hindi lagyan ng thermostat yung mga auto dito sa Pilipinas. Is it true?
Lagi kasi lumalabas yung warning light ko na "H" and sabi nung siraniko na kakilala ko, palitan ko na daw thermostat, sabi naman nung auto supply, pwede na kahit wala. Please advise.

No. Ang laking bagay ng thermostat. Ang masama lang sa thermostat, pag busted ito at hindi bumukas, panigurado ang overheat nito. Mura lang naman thermostat eh. Yan ang magmamaintain ng normal operating temperature ng sasakyan mo. Tsaka pag wala thermostat, matagal bago uminit yun makina.

1D4LV, sir, kung sakali kasi thermostat yan, depende kasi kung paano siya na-busted. Either hindi na siya bumukas o hindi na sumara. Kung hindi yan bumukas, magkakaroon pa rin ng loos of water/coolant tapos mabilis uminit yun sasakyan. Kung sakali na hindi naman sumara, tuloy lang circulation ng tubig tapos ang engine temperature mo ay hindi aabot sa normal operating temperature. Have it checked na rin para ma-eliminate natin yun problema sa thermostat.

[1D4LV]

No. Ang laking bagay ng thermostat. Ang masama lang sa thermostat, pag busted ito at hindi bumukas, panigurado ang overheat nito. Mura lang naman thermostat eh. Yan ang magmamaintain ng normal operating temperature ng sasakyan mo. Tsaka pag wala thermostat, matagal bago uminit yun makina.

1D4LV, sir, kung sakali kasi thermostat yan, depende kasi kung paano siya na-busted. Either hindi na siya bumukas o hindi na sumara. Kung hindi yan bumukas, magkakaroon pa rin ng loos of water/coolant tapos mabilis uminit yun sasakyan. Kung sakali na hindi naman sumara, tuloy lang circulation ng tubig tapos ang engine temperature mo ay hindi aabot sa normal operating temperature. Have it checked na rin para ma-eliminate natin yun problema sa thermostat.

thanks bro.... based sa sinabi mo, malamang thermostat. dati, medyo inaabot ako ng 3-5 minutes bago ko marating ang optimal temperature, ngayon, mga 1 minute lang.

i have also checked the hard starting issue with the supposed to be thermostat problem and i quote

"Test the coolant temperature sensor. What happens is when these go bad, they either cause the car not to get enough fuel when cold to getting to much fuel when the car is hot."

Is the coolant temperature sensor the same as the thermostat? I think so.... If yes, could this hold logic na talagang thermostat and problem?

[1D4LV]

Update: Couldnt find any leaks and it turns out the radiator cap was warped. Got an OEM Nissan cap from Yen.

Did you change water pumps already? On our Sentra, Corolla and Space Wagon before, we busted the water pump and it would drip water only when the engine was running.



You need the thermostat. It regulates coolant flow and allows your engine to maintain the optimal operating temperature.

vinj, yes.... changed water pump na when i changed the timing belt.

[JohnM]

Is the coolant temperature sensor the same as the thermostat? I think so.... If yes, could this hold logic na talagang thermostat and problem?

Nope. The thermostat is a valve with springs that opens and closes depending on the coolant temp. The coolant sensor is usually located near the thermostat housing but it could also be somewhere else on the block.

On cold starts the temp sensor signals the ECU to run a bit rich to aid starting. When the coolant temp increases it dials down the fuel accordingly.

[s10pao]

Is the coolant temperature sensor the same as the thermostat? I think so.... If yes, could this hold logic na talagang thermostat and problem?

boss sa pagkakaalam ko hiwalay pa yan. sa loob ng thermostat, may wax material yan na natutunaw at a specific temperature.

[1D4LV]

Nope. The thermostat is a valve with springs that opens and closes depending on the coolant temp. The coolant sensor is usually located near the thermostat housing but it could also be somewhere else on the block.

On cold starts the temp sensor signals the ECU to run a bit rich to aid starting. When the coolant temp increases it dials down the fuel accordingly.

ok, so it could mean na dalawa ang kailangan palitan?
the coolant sensor and the thermostat?

[JohnM]

ok, so it could mean na dalawa ang kailangan palitan?
the coolant sensor and the thermostat?

Possible. The thermostat is easy to check. Just take it out and put it in boiling water. If it opens it's still ok. It should close when put in warm water. The sensor however requires an electrical test. A sensor for your engine might be available in the surplus shops.

Nga pala what do you mean when you said na pumutok ang housing ng thermostat? Kinalawang then hininang na lang?

[1D4LV]

Possible. The thermostat is easy to check. Just take it out and put it in boiling water. If it opens it's still ok. It should close when put in warm water. The sensor however requires an electrical test. A sensor for your engine might be available in the surplus shops.

Nga pala what do you mean when you said na pumutok ang housing ng thermostat? Kinalawang then hininang na lang?

yung parang joint na nagcoconnect sa engine to the radiator.... thermostat housing daw yun eh.
pinalitan na yun, dahil hindi pwede idikit o hinangin.

[JohnM]

yung parang joint na nagcoconnect sa engine to the radiator.... thermostat housing daw yun eh.
pinalitan na yun, dahil hindi pwede idikit o hinangin.

Nilagyan naman ng gasket nung pinalitan?