overheat light on - Honda Shadow Forums : Shadow Motorcycle Forum
Reply
 
LinkBack Thread Tools
post #1 of 18 (permalink) Old 11-30-2012, 01:26 AM Thread Starter
Member
 
Join Date: Sep 2012
Posts: 231
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  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 11-30-2012, 06:21 AM
Senior Member
 
John Hopkins's Avatar
 
Join Date: Sep 2011
Location: Tredegar,South Wales, near England, not far from Scotland.
Posts: 5,352
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  
post #3 of 18 (permalink) Old 11-30-2012, 11:48 AM Thread Starter
Member
 
Join Date: Sep 2012
Posts: 231
thank you, John! I will do this check, wonder where are the fuses located, just in case...
harpomatic is offline  
post #4 of 18 (permalink) Old 11-30-2012, 12:02 PM
Member
 
Phantomjr's Avatar
 
Join Date: Aug 2010
Location: Conway, NH
Posts: 330
Assuming all 750s are similar, its behind right side cover.
Phantomjr is offline  
post #5 of 18 (permalink) Old 11-30-2012, 12:07 PM Thread Starter
Member
 
Join Date: Sep 2012
Posts: 231
thank you, will report on my progress!
harpomatic is offline  
post #6 of 18 (permalink) Old 11-30-2012, 01:16 PM
Member
 
SkullCrusher's Avatar
 
Join Date: Nov 2012
Location: massilon, ohio
Posts: 168
Also check coolant levels.
SkullCrusher is offline  
post #7 of 18 (permalink) Old 11-30-2012, 04:04 PM Thread Starter
Member
 
Join Date: Sep 2012
Posts: 231
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  
post #8 of 18 (permalink) Old 11-30-2012, 05:27 PM Thread Starter
Member
 
Join Date: Sep 2012
Posts: 231
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 05:35 PM.
harpomatic is offline  
post #9 of 18 (permalink) Old 11-30-2012, 08:30 PM
Senior Member
 
John Hopkins's Avatar
 
Join Date: Sep 2011
Location: Tredegar,South Wales, near England, not far from Scotland.
Posts: 5,352
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  
post #10 of 18 (permalink) Old 11-30-2012, 09:27 PM Thread Starter
Member
 
Join Date: Sep 2012
Posts: 231
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 10:22 PM.
harpomatic is offline  
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:
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









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
Show Printable Version Show Printable Version
Email this Page Email this Page



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

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