Can you test a clutch fan for proper operation? - Team Camaro Tech
Team Camaro Tech join team camaro
 
Camaro Parts at SS396.com     
GROUND UP & SS396.com         
Official Sponsor of Team Camaro
   

Auto Insurance



Registered users (free) do not see these large ads

Heating & Cooling Heating, cooling and air conditioning

Reply
 
Thread Tools Display Modes
  #1  
Old Jun 22nd, 10, 08:41 PM
rad454's Avatar
rad454 rad454 is offline
Senior Tech

Louie
 
Join Date: Feb 2009
Location: Oregon
Posts: 408
Default Can you test a clutch fan for proper operation?

Got the car out on the road and noticed the temp was hovering around 200 degrees. New high volume H20 pump and copper 4 core radiator. Engine is newly rebuilt (454). The temp outside is around 65 degrees so when it ramps up to 90-95 things will get much hotter. The only thing I can think of is the clutch on the fan may be getting old and in need of replacement.
Is there a way to test it? I turned it by hand and there is resistance.
__________________
69 SS/RS Fathom Green 454 4 speed

Bumper sticker- My other auto is a .45
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old Jun 22nd, 10, 10:18 PM
RSS RSS is offline
Gold Lifetime Member

Rick
 
Join Date: Jul 2002
Location: Las Vegas, NV.
Posts: 1,023
Default Re: Can you test a clutch fan for proper operation?

My neighbor tries to stop the fan while it's turning using a heavy shop rag, not recommended!!! If the car is up to temperature, shut it off while someone watches to see if the fan free-wheels. If it does, probably time for a new one.
__________________
*
It takes a fool or an idiot to first criticize! It takes a wise and intelligent man to first ask why!

1969 coupe under going restification (Almost Done!)
Reply With Quote
  #3  
Old Jun 23rd, 10, 12:40 AM
Hogdaddy Hogdaddy is offline
Senior Tech

mike
 
Join Date: Mar 2005
Location: Alabama
Posts: 1,506
Default Re: Can you test a clutch fan for proper operation?

I always thought that if after you turn off engine, if the fan keeps spinning then the clutch is bad.
__________________
1967 convertible T-1
Reply With Quote
  #4  
Old Jun 23rd, 10, 01:52 PM
Steptoe Steptoe is offline
Senior Tech

Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 12,850
Default Re: Can you test a clutch fan for proper operation?

Quote:
If the car is up to temperature, shut it off while someone watches to see if the fan free-wheels.
Wrong.....the engine can be up to temp, thats fine, doesnt mean the clutch engages
I dont know the temp, but considerring the temp idoit light is 235 deg, I would imagine the clutch would be up there somewhere.

I did some digging of info yrs ago...boiled down to the clutches very rarely fail if ever...the bearings do....has it play in the bearings?

Once you get upto 20/30 mph there is far more air going thru than the fan ever will put thru.....If it still runs hot the temp gauge is either out or something else in the cooling system is not working....or have a crome/polished sump/tappet covers...to much polished stuff that retains heat...which is why car manufactures for a 100+ yrs have black/painted sumps and radiators.
More heat is disipated thru the oil than thru the cooling system.
Reply With Quote
  #5  
Old Jun 23rd, 10, 03:24 PM
alanrw alanrw is offline
Senior Tech

Alan
 
Join Date: Oct 2007
Location: SoCal
Posts: 3,903
Default Re: Can you test a clutch fan for proper operation?

I read here a couple of years back to roll up some newspaper and try to stop the fan.

alan
Reply With Quote
  #6  
Old Jun 23rd, 10, 03:34 PM
67 RSS 67 RSS is offline
Gold Lifetime Member

Lane
 
Join Date: Feb 2002
Location: Livermore, CA USA
Posts: 1,157
Default Re: Can you test a clutch fan for proper operation?

I've failed a few on my 72 BBC- my experience is that the clutch locks up then fan no longer "freewheels". Engine pinging from the increased fan load is the first clue ...seems a bit odd it has that much effect..
So..if its cool and locked solid its toast..never had one fail in the other direction i.e. freewheel when hot ..
Reply With Quote
  #7  
Old Jun 23rd, 10, 05:11 PM
speedfreek speedfreek is offline
Senior Tech

Patrick
 
Join Date: Jun 2005
Location: Quitman Georgia
Posts: 2,516
Default Re: Can you test a clutch fan for proper operation?

This is how I test them.

After driving for a while, I'd say 30min, and with the engine off spin the fan over with your hand. It should not turn over more than 1 revolution. If it does it is bad.
__________________
69RS/SS,383,10:1cr,4.10,60ft1.6sec,1/8-7.6sec@88mph,1/4-12.1@110mph,Vicjr,RPMheads,750dp, Proform main body, cam,246*-250*@.050,.510,522,1.6rr,700r4,3200stall
383 IS SOLD!
Building a 489BBC
http://s90.photobucket.com/albums/k264/pnewell44/
Reply With Quote
  #8  
Old Jun 23rd, 10, 06:53 PM
foreverlookin's Avatar
foreverlookin foreverlookin is offline
Gold Lifetime Member

Steve
 
Join Date: Oct 2002
Location: Santa Clarita, California
Posts: 1,522
Default Re: Can you test a clutch fan for proper operation?

Belt squealing at higher RPM and taking the bearings out of the water pump.
__________________
Steve
The best laid plans are those not made (mine)
http://www.flickr.com/photos/14503593@N03/
Reply With Quote
  #9  
Old Jun 23rd, 10, 08:47 PM
Steptoe Steptoe is offline
Senior Tech

Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 12,850
Default Re: Can you test a clutch fan for proper operation?

Quote:
I always thought that if after you turn off engine, if the fan keeps spinning then the clutch is bad.
Quote:
I read here a couple of years back to roll up some newspaper and try to stop the fan.
No offence meant but theres a lot of ppl out there that read hear stuffand never varified it...most old wives tales

Quote:
After driving for a while, I'd say 30min, and with the engine off spin the fan over with your hand. It should not turn over more than 1 revolution. If it does it is bad.
I had a 'theory' when I put my new one in...because of stuffed bearings....that something like that 'should work' but never noticed any difference...but I never had running hot issues....runs max 170 (low due to the fuel I run)...it just free wheeled and still does like normal...
Im bloody sure temps have to get up (like I mentioned above) around 220 or something.

Also note there are several types for different applications
Reply With Quote
  #10  
Old Jun 24th, 10, 04:27 PM
markw markw is offline
Senior Tech

 
Join Date: Apr 2008
Location: Illinois
Posts: 613
Default Re: Can you test a clutch fan for proper operation?

Reply With Quote
  #11  
Old Jun 24th, 10, 08:58 PM
Steptoe Steptoe is offline
Senior Tech

Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 12,850
Default Re: Can you test a clutch fan for proper operation?

Yep its on utube..got to be correct
We have saying in NZ "yeah right"
Reply With Quote
  #12  
Old Jun 25th, 10, 08:04 AM
Big Iron Big Iron is offline
Gold Lifetime Member

Bob
 
Join Date: Apr 2008
Location: Florida
Posts: 307
Default Re: Can you test a clutch fan for proper operation?

Have you checked your thermostat? What is the actual opening temp? I would think going down the road with an outside temp. of 65 degrees the engine would be operating at what ever degree thermostat you have.
What is the temp. when you are stopped, say in slow traffic.

Quote:
Originally Posted by rad454 View Post
Got the car out on the road and noticed the temp was hovering around 200 degrees. New high volume H20 pump and copper 4 core radiator. Engine is newly rebuilt (454). The temp outside is around 65 degrees so when it ramps up to 90-95 things will get much hotter. The only thing I can think of is the clutch on the fan may be getting old and in need of replacement.
Is there a way to test it? I turned it by hand and there is resistance.
Reply With Quote
  #13  
Old Jun 25th, 10, 10:45 AM
rad454's Avatar
rad454 rad454 is offline
Senior Tech

Louie
 
Join Date: Feb 2009
Location: Oregon
Posts: 408
Default Re: Can you test a clutch fan for proper operation?

I have a 160 degree thermostat in the car and after reading up on the subject here, realized that the t-stat does not determine engine running temp. Didnt know that. So, the fan is probably working, the t-stat should be a 180-195, and I am considering changing over from a 4 core copper radiator to an all aluminum radiator. Found one that is an aftermarket factory replacement for $248.00. Heard good things about their ability to cool.
__________________
69 SS/RS Fathom Green 454 4 speed

Bumper sticker- My other auto is a .45
Reply With Quote
  #14  
Old Jun 25th, 10, 10:58 AM
Skeeter55's Avatar
Skeeter55 Skeeter55 is offline
Gold Lifetime Member

Skip
 
Join Date: Feb 2008
Location: CA
Posts: 6,621
Default Re: Can you test a clutch fan for proper operation?

On a thermal clutch fan at first start up you should feel the fan pulling air for about 3-5 seconds, also the thermal doesn't engage the clutch until 190* and above... So if your temp is high then check to see if the clutch/fan is pulling lots of air threw the grill or just pop the hood and you can feel it.

On a non-thermal clutch fan will be pulling lots of air at idle no matter how hot or cooled its is then free up at a certain rpm.
__________________
I NEED TO HIT THE LOTTERY
Reply With Quote
  #15  
Old Jun 25th, 10, 12:24 PM
alanrw alanrw is offline
Senior Tech

Alan
 
Join Date: Oct 2007
Location: SoCal
Posts: 3,903
Default Re: Can you test a clutch fan for proper operation?

But Skeeter, how would a non-thermal clutch free up? Are you talking about a fan without the clutch, just a straight bolt on item?

alan
Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 12:48 AM.



Camaros.net - 2009 AutoForums.com