Cooling fan - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
 1Likes
  • 1 Post By Rimneck
 
LinkBack Thread Tools
post #1 of 7 (permalink) Old 01-28-2019, 08:28 PM Thread Starter
Honda Rider
 
Join Date: Dec 2018
Location: Tulsa
Posts: 26
Cooling fan

Hello, is the cooling fan supposed to come on at startup? I've rode it for 10 mins and let it idle and the fan never came on. It got very hot but no temp light. The fan works when applying voltage directly. But not when using the wire in the rear wheel well. The are some faint clicking noises when doing this.

2002 Rancher 350 es 4x4
2003 Foreman 450 es 4x4
KeystoneMud is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 01-29-2019, 03:38 AM
Honda Lover
 
Join Date: Dec 2017
Location: New Brunswick Canada
Posts: 300
The fan doesn't stay on all the time, mine barely comes on in the summer here.
Trout Brook Rider is offline  
post #3 of 7 (permalink) Old 02-07-2019, 05:06 PM
Honda Addict
 
Join Date: Jun 2018
Posts: 101
Mine is squirrely acting. Sometimes it comes on for a few seconds when I turn the key on. Then sometimes you think your leg is going to melt off and it won't turn on. Then it turns on and won't turn off until you kill the machine and restart.
Rimneck is offline  
 
post #4 of 7 (permalink) Old 02-07-2019, 07:02 PM
Administrator
 
toodeep's Avatar
 
Join Date: Aug 2007
Location: south dakota
Posts: 12,982
Garage
Both sound like bad fan control unit. It's the small expensive black box under the front fender. I would just wire it up to manually control it.

Sent from my SM-G965U using Tapatalk



2007 420FM (475cc, 27x12x12 Mudbugs) ---------- 1995 300FW (webcamshaft, 350 rear end)
2008 420FE (26x9x12 BearClaws) -------------------
1988 300 (old stock machine, nothing fancy)
2009 420FA (25x8/10x12 BearClaw HTR) ---------
1987 350D (work in progress)

toodeep is offline  
post #5 of 7 (permalink) Old 02-12-2019, 02:38 PM
Honda Addict
 
Join Date: Jun 2018
Posts: 101
Quote:
Originally Posted by toodeep View Post
Both sound like bad fan control unit. It's the small expensive black box under the front fender. I would just wire it up to manually control it.
Here it is in case someone gets industrious.

CONTROL UNIT, FAN
38710-HM7-004

Wilbur likes this.
Rimneck is offline  
post #6 of 7 (permalink) Old 03-05-2019, 03:24 PM
Honda Red Wing Rider
 
action450s's Avatar
 
Join Date: Oct 2009
Location: Newfoundland, Canada
Posts: 818
Garage
Recently my fan stopped working, I had replaced the temperature sensor & fan control unit about 5 years ago and hoped they were not defective again. I followed the diagnosis procedure in the Honda Repair Manual which has you do a bunch of Multimeter tests at the electrical connector on the Fan Control unit (pictured above under the front fender) You can unplug it and do your tests without having to remove the front plastics. From that I determined I had an open circuit (disconnected or cut wire) to the temperature sensor, everything else checked OK.

Upon further inspection the brass connector inside the rubber boot that plugs into the oil temperature sensor (bottom rear of engine) was broken. I tested the circuit by cutting off the old connector and touching the wire to frame ground and the fan turned on. I made a new crimp on connector, soldered it on, plugged it in and my fan now works perfect.

So before buying parts, at least inspect the wiring, and the best way to diagnose is to follow the steps in the repair manual.

For ATV projects and crew adventures you can check out my site www.shed-headz.com.

1998 Foreman 450s - not stock
1985 Honda 250sx - in progress
action450s is offline  
post #7 of 7 (permalink) Old 03-05-2019, 04:11 PM
Honda Lover
 
Join Date: Nov 2018
Location: South Texas
Posts: 307
Quote:
Originally Posted by KeystoneMud View Post
Hello, is the cooling fan supposed to come on at startup? I've rode it for 10 mins and let it idle and the fan never came on. It got very hot but no temp light. The fan works when applying voltage directly. But not when using the wire in the rear wheel well. The are some faint clicking noises when doing this.

Don't know what kind of bike you have but I live in the south and mine only comes on after about 20 minutes of riding on an 80 degree day. It takes a while.

2007 Foreman 500FM
2014 Foreman 500FM
Service Manuals Link: https://drive.google.com/drive/folde...7LP-eZp2jMRVJU
Wilbur is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
05 rancher cooling fan cr1 Honda Rancher 350, 400 & 420 0 04-20-2007 11:02 PM
Cooling Fan Not Working culvert Foreman 450 5 06-27-2006 12:55 PM
Cooling Fan Quit Working Hondaman Foreman 450 5 04-18-2006 07:16 AM
Cooling fan control unit pitch black Foreman 450 1 12-03-2005 03:08 PM
Cooling fan? itasca Foreman 450 5 09-11-2005 09:30 AM

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome