Clutch Fan
Thread Starter
|
Senior User
Joined: Jun 2006
Posts: 218
Likes: 0
Clutch Fan
I was getting my truck smogged two days ago (1992 F150 4.9L inline). While he had the engine RPMs up, i noticed my fan was barley spinning at all. So i went to the cap noticed my truck was getting really hot, boiling hot in fact. Once back to idle the fan spun ok, enough to get the air moving over the fins. The temps started back down but never reached normal. So I drove it to NAPA got a fan clutch, replaced it.
Now my question may see ignorant, and maybe it is, but thats why Im asking. I couldnt find the answer searching so bare with me. Is the fan clutch engaged by RPMs or by tempeture? How exactly does it work, and what is the purpose. I have read that it will dissengage when at highway speeds, is that true? Thanks for the time.
Now my question may see ignorant, and maybe it is, but thats why Im asking. I couldnt find the answer searching so bare with me. Is the fan clutch engaged by RPMs or by tempeture? How exactly does it work, and what is the purpose. I have read that it will dissengage when at highway speeds, is that true? Thanks for the time.
Posting Guru
Joined: Dec 2006
Posts: 1,923
Likes: 0
dunno what engages or disangages it i wanna know myself.. but to chek it its easy ..
when engine off try to turn the fan if it spins freely with barely no resistence then its bad
it should spin but with a bit of work
when engine off try to turn the fan if it spins freely with barely no resistence then its bad
it should spin but with a bit of work
Posting Guru
Joined: May 2007
Posts: 1,208
Likes: 2
From: North Reading Mass
These clutch fans have a viscous fluid that will engage the fan at low RPMs and disengage at higher RPMs. Most but not all have a temperature sensitive element that will let the fan disengage at low temps. Most last a long time, both of my fan failures were @ 150k or more. I did replace them with twin electric fans (junkyard).
regards
rikard
regards
rikard
Thread Starter
|
Senior User
Joined: Jun 2006
Posts: 218
Likes: 0
Yeah I knew that, and there is no question in my mind that the old clutch is bad. I took it out this morning and it looks like its been leaking fluid in the front of the clutch at the coil spring. I put the new one in and my God the amount of air its pulling through now.
Cargo Master
Joined: Sep 2004
Posts: 2,691
Likes: 6
Trending Topics
Post Fiend
Joined: Nov 2007
Posts: 9,944
Likes: 4
From: Somewhere In FTE Land
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread Starter
|
Senior User
Joined: Jun 2006
Posts: 218
Likes: 0
well what im saying is that when at a standstill and the RPMs are up the fan wasnt working, the engine was over heating. at idle that engine was slow enough for the fan to bring a little air over the fins. But this new clutch i just put it spins when cold. I just wasnt sure if it was supposed to do that or not.
Elder User
Joined: Dec 2006
Posts: 550
Likes: 1
From: Hillsboro, OR
Originally Posted by relaxed guy
Does your truck still have the fan shroud? Iif it doesn't the clutch may never get hot enough to engage.
Thread
Thread Starter
Forum
Replies
Last Post
ididntdoit99
1987 - 1996 F150 & Larger F-Series Trucks
6
Aug 12, 2013 10:39 AM
Milwaukee1979F150
1999 - 2003 7.3L Power Stroke Diesel
12
Dec 10, 2011 06:34 AM