Start-up ROAR!!! - Page 2 - Nissan Frontier Forum
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#11 (permalink) Old 11-20-2012, 03:59 PM
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The noise I was referring to was not high idle. After the initial roar up, I can raise the RPM as high as I want to without reproducing it. It did sound like the fan going full speed, but it's hard to start the engine and see the fan at the same time. Now I know.
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Rob
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#12 (permalink) Old 11-20-2012, 05:00 PM
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A thermal fan clutch is engaged on a cold startup because the fluid drains into the working area when the engine is shut off. The fan clutch will slow down shortly after startup as a result of a pumping action produced by a difference in speed between the shaft and the body of the clutch.

A Good article on this can be found at the following:
Hayden - Home


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#13 (permalink) Old 11-20-2012, 07:33 PM
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Quote:
Originally Posted by jlg2002 View Post
A thermal fan clutch is engaged on a cold startup because the fluid drains into the working area when the engine is shut off. The fan clutch will slow down shortly after startup as a result of a pumping action produced by a difference in speed between the shaft and the body of the clutch.

A Good article on this can be found at the following:
Hayden - Home
Interesting I never knew why they did that.
I managed to get a look at it starting this afternoon and that is definitely the noise. That fan you can feel it run up and slow down from the wind on your face.
cheers Rob
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#14 (permalink) Old 11-20-2012, 08:22 PM
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that's how I know when my wife sneaks off my mcdonalds in the mornings....
Haven't really dug into it, but its normal. my 06X has always done it.

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#15 (permalink) Old 11-20-2012, 10:27 PM
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Mine has done it since day 1. Sounds mean (son loves it.)
So does my son.....
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#16 (permalink) Old 11-21-2012, 03:56 PM
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So does my son.....
so does my 2 year old little girl, she says "vrooom" when it starts, mine is way loud due to the banks exhaust lol and i love it

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