Cooling fans at startup
#1
04-30-08, 09:00 AM
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Cooling fans at startup
this is strictly "curiosity" question.
does anyone KNOW why half ton trucks, their heavier duty brethren, and related SUVs turn on cooling fans at cold engine startup?
isn't the point to WARM IT UP, instead of cool it down? gmc, f-ord, dodge - all do this. sound like tanks at start up. relays click, fans kick in, whole symphony.
why?
does anyone KNOW why half ton trucks, their heavier duty brethren, and related SUVs turn on cooling fans at cold engine startup?
isn't the point to WARM IT UP, instead of cool it down? gmc, f-ord, dodge - all do this. sound like tanks at start up. relays click, fans kick in, whole symphony.
why?
#2
04-30-08, 02:04 PM
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Well, the fans are probably not to cool the engines down, but cool the transmission fluid radiator thats mounted to the radiator as well. I'm sure these heaver trucks heat up the fluid fairly quickly.
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04-30-08, 02:10 PM
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Originally Posted by HotinOKC
Well, the fans are probably not to cool the engines down, but cool the transmission fluid radiator thats mounted to the radiator as well. I'm sure these heaver trucks heat up the fluid fairly quickly.
i don't mind them, fans doing it at all, it even sounds cool, sort of waking power. just am darn curious why. but it's very cool - of course, it's my perception of coolness - to stand next to truck and listen to all those thhhhhhhhuuuuuuuummmmmppppp when those fans kick in.
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04-30-08, 02:13 PM
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lol. The fans with the clutch sound even better then the electrical types. My fan in my car will automatically come on, on startup if my A/C is on, or anytime in the summer for that fact.
I'm sure there is another reason for it, but that's just something that popped into my head at the time.
I'm sure there is another reason for it, but that's just something that popped into my head at the time.
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04-30-08, 04:05 PM
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Originally Posted by ukrkoz
this is strictly "curiosity" question.
does anyone KNOW why half ton trucks, their heavier duty brethren, and related SUVs turn on cooling fans at cold engine startup?
isn't the point to WARM IT UP, instead of cool it down? gmc, f-ord, dodge - all do this. sound like tanks at start up. relays click, fans kick in, whole symphony.
why?
does anyone KNOW why half ton trucks, their heavier duty brethren, and related SUVs turn on cooling fans at cold engine startup?
isn't the point to WARM IT UP, instead of cool it down? gmc, f-ord, dodge - all do this. sound like tanks at start up. relays click, fans kick in, whole symphony.
why?
Mechanical clutch fan works base on temperature, the fluid inside the coupler needs to be at certain temp to locks up the clutch and engages the fan, too cold like in the morning will also locks it up(fluid getting thick) until warming up then it's spinning free until the temp is hot(fluid expanded), it'll locks up again.
If you left your a/c or defrogger on and start the engine, the electric fan will kicks on regardless of temp.
#6
04-30-08, 06:49 PM
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Originally Posted by New guy
Are you talking about mechanical clutch fan or electric fan?.
Mechanical clutch fan works base on temperature, the fluid inside the coupler needs to be at certain temp to locks up the clutch and engages the fan, too cold like in the morning will also locks it up(fluid getting thick) until warming up then it's spinning free until the temp is hot(fluid expanded), it'll locks up again.
If you left your a/c or defrogger on and start the engine, the electric fan will kicks on regardless of temp.
Mechanical clutch fan works base on temperature, the fluid inside the coupler needs to be at certain temp to locks up the clutch and engages the fan, too cold like in the morning will also locks it up(fluid getting thick) until warming up then it's spinning free until the temp is hot(fluid expanded), it'll locks up again.
If you left your a/c or defrogger on and start the engine, the electric fan will kicks on regardless of temp.
thank you for educating me.
#7
05-01-08, 02:58 AM
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All mechanical clutch fan does that, I guess due to long period/overnight parked or even if you parked it for couple of hours, the fluid runs down on the bottom and has a temdency of "jammed" the cluch while it cooling off until it's started and spinning around.
