overheat light on - Honda Shadow Forums : Shadow Motorcycle Forum

Reply
 
LinkBack Thread Tools
Old 11-30-2012, 02:26 AM   #1 (permalink)
Member
 
Join Date: Sep 2012
Posts: 196
Default overheat light on

the red light came on after about an hour of riding. As i got off the highway, sat in a mild traffic, and the light turned on. I got off the road, turned the engine off. Few minutes later, start, and off I went, without any problems. After a while, I rode back, also problem free. No weird noises. The fan did not seem to go on. A week ago I rode in a heavy traffic for an hour, and definitely heard the fan coming on. As I rode fast, without the traffic on the way back, and in somewhat cold temps of close to 33F, I think I could have been getting away with "air cooling", but I'm wondering if there is something wrong with fan or thermostat - any way to check it? It was a bit too dark to really see what's the level in the coolant reservoir, will take a look tomorrow, as the daylight would be helpfull...
Oh, BTW, it is ACE 750...
harpomatic is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-30-2012, 07:21 AM   #2 (permalink)
Senior Member
 
John Hopkins's Avatar
 
Join Date: Sep 2011
Location: Tredegar,South Wales, near England, not far from Scotland.
Posts: 4,734
Default

Look at the engine side of the bottom of the radiator, there is a single wire connected to something that looks like a large bolt, it has a spade connector so you can just pull it off..

With the ignition switched on touch that spade connector to any bolt that connects to the frame (ground) if the fan is ok it will run..

A modification you might want to do for when you are stuck in traffic and the engine is getting hot:-

Fit a handlebar switch and run one wire to the spade connector wire (you can get a simple in line adaptor) and the other wire to ground or frame..Now with the switch off the fan will start as it normally does but you can bypass the thermal switch and switch the fan on anytime you want to.

John.
__________________
Beauty is only skin deep but ugly goes right to the bone.
John Hopkins is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 12:48 PM   #3 (permalink)
Member
 
Join Date: Sep 2012
Posts: 196
Default

thank you, John! I will do this check, wonder where are the fuses located, just in case...
harpomatic is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 01:02 PM   #4 (permalink)
Member
 
Phantomjr's Avatar
 
Join Date: Aug 2010
Location: Conway, NH
Posts: 326
Default

Assuming all 750s are similar, its behind right side cover.
Phantomjr is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 01:07 PM   #5 (permalink)
Member
 
Join Date: Sep 2012
Posts: 196
Default

thank you, will report on my progress!
harpomatic is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 02:16 PM   #6 (permalink)
Member
 
SkullCrusher's Avatar
 
Join Date: Nov 2012
Location: massilon, ohio
Posts: 168
Default

Also check coolant levels.
SkullCrusher is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 05:04 PM   #7 (permalink)
Member
 
Join Date: Sep 2012
Posts: 196
Default

ok friends, luckily I found the immediate problem right away - the fuse(fan) was blown, indeed. Now, what caused it - I hope just old age, it seemed a bit oxidized... Coolant level is just right, could not really find those switches on the bottom of my radiator, though...
harpomatic is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 06:27 PM   #8 (permalink)
Member
 
Join Date: Sep 2012
Posts: 196
Default

ok, aparently, the fan is not kicking in - i started the bike, let it idle for about 20 minutes - the light came on, but the fan did not kick in. Will check the fuse tomorrow, as it got too dark to see now...
Also, John - are you talking about the very bottom left on the radiator, where I see some black wire with a black rubber sleeve going into what looks like, rather a large "nut", or a bit above, midway - there are also wires with a white rectangular "connecting", or may be it is only a fastener kind of thing. Not being shure what to pull, I thought I'd rather ask first. Both are on the left side(from sitting on the bike point of view), 98 Ace750.

Last edited by harpomatic; 11-30-2012 at 06:35 PM.
harpomatic is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 09:30 PM   #9 (permalink)
Senior Member
 
John Hopkins's Avatar
 
Join Date: Sep 2011
Location: Tredegar,South Wales, near England, not far from Scotland.
Posts: 4,734
Default

Quote:
Originally Posted by harpomatic View Post
ok, aparently, the fan is not kicking in - i started the bike, let it idle for about 20 minutes - the light came on, but the fan did not kick in. Will check the fuse tomorrow, as it got too dark to see now...
Also, John - are you talking about the very bottom left on the radiator, where I see some black wire with a black rubber sleeve going into what looks like, rather a large "nut", or a bit above, midway - there are also wires with a white rectangular "connecting", or may be it is only a fastener kind of thing. Not being shure what to pull, I thought I'd rather ask first. Both are on the left side(from sitting on the bike point of view), 98 Ace750.
To test the fan you do not need the engine running just the ignition switched on...

That rather large nut is a thermistor it has a single wire connected to it with a push on spade shaped connector which just pulls off..if you touch that to ground the fan should run..

The thermistor changes it's resistance and opens a path to ground when it gets hot..having a lot of sludge in the bottom of the radiator can insulate the thermistor from the hot water and stop it from working..but the test I described bypasses the thermistor.

John.
__________________
Beauty is only skin deep but ugly goes right to the bone.
John Hopkins is offline   Reply With Quote Quick reply to this message
Old 11-30-2012, 10:27 PM   #10 (permalink)
Member
 
Join Date: Sep 2012
Posts: 196
Default

Got it John , thank you, will do tomorrow. While i am there - maybe I should pull the thermostat as well, to check it's condition, can it just be unscrewed (the "nut")? Do I drain the radiator for that? I did some search on these questions, but so far did not find much info yet...
Edit: Just checked clymer's - they call it "fan switch", I'm sure John means to unplug there, but if anyone has a tip on the possible cleaning procedure of that unit - would be great to be equipped with some wisdom from fellas here...

Last edited by harpomatic; 11-30-2012 at 11:22 PM.
harpomatic is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Honda Shadow Forums : Shadow Motorcycle 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 09:17 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Forum Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum Kawasaki Ninja 250SL Forum