Pros and Cons ng naka-rekta ang engine fan

[brainmafia_310]

pero kung hindi naman nag-ci-circulate ung coolant (assuming ok pa ung thermostat) kaya pa rin ma-reach ang operating temp dba?

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Yup but lower than usual. Radiator fluid is being circulated by the water pump and it ia happening only when the engine is running, AFAIK.

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[s10pao]

Yup but lower than usual. Radiator fluid is being circulated by the water pump and it ia happening only when the engine is running, AFAIK.

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so wala dapat issue sa operating temp ng engine kasi ung coolant ay nandun lang sa radiator at hindi dumadaloy sa engine habang closed pa ung thermostat, tama ba?

ang issue na lang ay mas mabilis masisira ung fan.

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[oj88]

With a properly working thermostat, even if the aux fan is working continuously, it shouldn't have much effect on the engine optimal temp. However, it is a waste of energy to keep it running when not needed.

[zap.FREEDOM]

just a recommendation, since your aux fan is wired directly at the ignition switch (which tends to start operating once the ignition turnon) instead of wiring it into the ignition switch, re-wired it and put a separate switch, so that you can turn it on and off on times its just need to be operate. yung akin nakaganyan, may switch siya, so kapag half na yung temperature gauge ko dun ko lang siya bubuksan then pagbumababa,...papatayin ko na ulit...pangit kasi nakarekta,

[12vdc]

sirs can you further elaborate? kasi ung thermostat naman ang nag-co-control ng circulation ng coolant dba?

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Rad fan and Thermostat works hand-in hand to maintain coolant temp.

At engine startup, thermostat is closed and rad fan is shut. Coolant circulates in the engine block only thru the bypass valve of the thermostat. When engine reach operating temp, thermostat opens and remains open allowing coolant to circulate from the water pump to the radiator then backto the engine block.

Radiator fan will turn on when the thermal switch sensed that the coolant temp exceeded the limit. This then lowers the temperature thru the heat exchanger(radiator) by transferring heat (thru conduction - air is a heat conductor) from the radiator fins to the ambient air (by turning on the fan thereby blowing air accelerates thermal conduction from the source/coolant to the sink/ambient air).

So imagine what happens when you turn on the rad fan at engine startup, it will take longer for your engine to reach operating temp thereby wasting your time and fuel while idling your engine to reah opeating temp. If you drive the car with cool engine, more fuel will be wasted since you are pumping more fuel to the combustion chamber and most of it escapes.

[ceekeigh]

just a recommendation, since your aux fan is wired directly at the ignition switch (which tends to start operating once the ignition turnon) instead of wiring it into the ignition switch, re-wired it and put a separate switch, so that you can turn it on and off on times its just need to be operate. yung akin nakaganyan, may switch siya, so kapag half na yung temperature gauge ko dun ko lang siya bubuksan then pagbumababa,...papatayin ko na ulit...pangit kasi nakarekta,

Ma-try nga po to. Thanks po sa suggestions. Nung nakuha ko kc to nakarekta na.

[ceekeigh]

Rad fan and Thermostat works hand-in hand to maintain coolant temp.

At engine startup, thermostat is closed and rad fan is shut. Coolant circulates in the engine block only thru the bypass valve of the thermostat. When engine reach operating temp, thermostat opens and remains open allowing coolant to circulate from the water pump to the radiator then backto the engine block.

Radiator fan will turn on when the thermal switch sensed that the coolant temp exceeded the limit. This then lowers the temperature thru the heat exchanger(radiator) by transferring heat (thru conduction - air is a heat conductor) from the radiator fins to the ambient air (by turning on the fan thereby blowing air accelerates thermal conduction from the source/coolant to the sink/ambient air).

So imagine what happens when you turn on the rad fan at engine startup, it will take longer for your engine to reach operating temp thereby wasting your time and fuel while idling your engine to reah opeating temp. If you drive the car with cool engine, more fuel will be wasted since you are pumping more fuel to the combustion chamber and most of it escapes.

Now I understand na po. Thanks po.

[12vdc]

So madali lang masira yung fan kc laging naka-on?

And dun sa operating temparature ng makina yun lang effect nun?

T u m p a k !

[s10pao]

Rad fan and Thermostat works hand-in hand to maintain coolant temp.

At engine startup, thermostat is closed and rad fan is shut. Coolant circulates in the engine block only thru the bypass valve of the thermostat. When engine reach operating temp, thermostat opens and remains open allowing coolant to circulate from the water pump to the radiator then backto the engine block.

Radiator fan will turn on when the thermal switch sensed that the coolant temp exceeded the limit. This then lowers the temperature thru the heat exchanger(radiator) by transferring heat (thru conduction - air is a heat conductor) from the radiator fins to the ambient air (by turning on the fan thereby blowing air accelerates thermal conduction from the source/coolant to the sink/ambient air).

So imagine what happens when you turn on the rad fan at engine startup, it will take longer for your engine to reach operating temp thereby wasting your time and fuel while idling your engine to reah opeating temp. If you drive the car with cool engine, more fuel will be wasted since you are pumping more fuel to the combustion chamber and most of it escapes.

same lang ba ang thermal switch ng thermostat at radiator fan? ang alam ko kasi independent ung thermostat dun sa ibang thermal sensors ng engine, may wax lang sya sa loob na natutunaw in a specific temp na nagbubukas dun sa valve ng thermostat.

umiikot na ba ung collant galing sa radiator kahit closed pa ung thermostat?

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[12vdc]

same lang ba ang thermal switch ng thermostat at radiator fan? ang alam ko kasi independent ung thermostat dun sa ibang thermal sensors ng engine, may wax lang sya sa loob na natutunaw in a specific temp na nagbubukas dun sa valve ng thermostat.

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Magkaiba yan.

Thermostat coolant - mounted in the outlet of the cooling system. Mechanical valve that opens when engine hits the temp. Tama ka, wax nalulusaw then tumitigas, remains open/partially open when you hit the operating temparature range.

Thermostat switch coolant/ fan thermal switch - mounted in the coolant housing. Could be same as thermocouple/ bi-metallic strip, pero in modern engines electronic na ito works by resistor(called thermistor). Remember that when you heat a conductor it resist flow of electrons(higher resistance) this acts as a sensor, a bias or a shunt to another voltage sensing circuit. Same din ng principle sa mass-air flow sensor, pinapainit yung conductor then measures air flow thru the volume of electrons.Thermostat switch does not directly drive the radiator fan, may dinadaanan pa line driver or a relay to pass the heavy current demand of an electric motor/fan motor

Thermostat aircon - thermacouple device, electromechanical switch mounted at the evaporator.

Thermostat - ambient temp sensor. Same as thermistor, nakakabit sa malapit sa grille on some cars to monitor ambient air. Used by the computer to decide when to turn on the aircon and some other functions.

umiikot na ba ung collant galing sa radiator kahit closed pa ung thermostat?

OO, umiikot na ang coolant sa loob lang ng engine block kung nakasara pa ang thermostat. Kung hindi iikot ang coolant masisira ang water pump at sasabog ang water jackets going to the smaller cooling tubes of EGR, turbo, etc dahil tataas ang pressure. May bypass valve ang thermostat.