loud at start up. normal?
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Senior User
Joined: Apr 2003
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From: Greensboro
loud at start up. normal?
A 2005 Ex I am looking at runs real loud at start up. I don't hear any piston slap, just real loud when cold, after about 10 seconds, quiets down to norm. any thoughts would be appreciated.
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Joined: Feb 2003
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From: Jersey Shore on the Right
Sounds like my son's 98 Pathfinder - centrifugal fan? Real loud at startup and then quiets down. Seasonal - not in the summer, only in the colder months. Can anyone confirm the presence of a centrifugal fan on the Expy's. My 99 was louder than usual this weekend, starting to get cold here in Jersey.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
yes very normal. the new 5.4 3v engine has a fast idle of up to 2,000 rpm. the thermofan is engaging and pulling almost 3,500 cubic fee of air a minute. with that volume of air it will be a little loud. but very normal and it does not bother most people.
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From: Jersey Shore on the Right
Thermofan - much better description than centrifugal fan. Since it's mechanically driven by the serpentine belt what controls the spin speed?
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
Originally Posted by Darth Baiter
Thermofan - much better description than centrifugal fan. Since it's mechanically driven by the serpentine belt what controls the spin speed?
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