loud at start up. normal?
Thread Starter
|
Senior User
Joined: Apr 2003
Posts: 196
Likes: 0
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.
Senior User
Joined: Feb 2003
Posts: 302
Likes: 0
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
Posts: 26,007
Likes: 575
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.
Senior User
Joined: Feb 2003
Posts: 302
Likes: 0
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?
Trending Topics
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
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?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post
Aftrmidnite
General Automotive Discussion
1
Jan 2, 2015 04:22 PM
Jmroach
1997 - 2006 Expedition & Navigator
5
May 14, 2014 08:45 AM
