Cooling Problem - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
the exhaust. If it has to do with the cooling,
engine or exhaust, discuss it here!

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 03-29-2007, 05:38 PM Thread Starter
 
Join Date: Mar 2007
Posts: 8
iTrader: (0)
 
Cooling Problem

I am not a mechanic which will be obvious by my questions. I just started riding my new (well, new to me) 97 Vulcan 750 and this past Sunday, I noticed that it was overheating according to the gauge. The tach never worked and I thought the temp gauge was not functional either. For the two days previous, the fan would run for a few seconds after I quit riding and shutoff pretty quickly after I shut the bike down. On Sunday, I noticed the fan no longer would run. Anytime I would start up the bike it would overheat fairly quickly but the fan never ran again. The previous owner said that the guage was messed up and the bike shop he took it to said it was not overheated and the gauge was wrong.

Anyway, upon advice from a friend, I got a jumper wire and connected it to the disconnected connector from the cooling fan thermo switch to see if the fan would run if I bypassed the switch. It did. Now my friend wants me to test to see if the radiator is grounded by using an ohmmeter by using the lead to the nut that attaches the switch to the radiator and the other lead to a grounded area. He said if the meter showing connection that it is grounded.

Anyone have ideas if it could be something else?
L8nliferydr is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 03-29-2007, 06:09 PM
Members who have donated towards server costs
 
fergy's Avatar
 
Join Date: Mar 2006
Location: Kyle, Texas
Posts: 4,054
iTrader: (3)
   
Someone correct me if I'm wrong, but that sounds like a good test for a shorted sending unit. It's not uncommon for the fan switch to get corroded and short out, mainly because of constant splash up and road grime.

Your post doesn't say where you are, but if you're running hot, and the weather is not too warm yet, I'd be checking your entire cooling system. You don't want to run these bikes hot. It will damage your stator which is no fun.

Fergy
Kyle, TX VN750.com member #707 VROC#19556
2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
SEAFOAM JUNKIE!


fergy is offline  
post #3 of 9 (permalink) Old 03-29-2007, 09:25 PM
HAWK
 
Ccspinner's Avatar
 
Join Date: Feb 2006
Location: Chicago land
Posts: 2,576
iTrader: (9)
 
Send a message via Yahoo to Ccspinner
When was the last time you flushed the coolent system?
I would also check the sending unit.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
Ccspinner is offline  
 
post #4 of 9 (permalink) Old 03-29-2007, 09:36 PM Thread Starter
 
Join Date: Mar 2007
Posts: 8
iTrader: (0)
 
I just got the bike two weeks ago. Last weekend the bike was running fine, the fan was running, and it was not overheating. I believe the temp gauge is working properly. Does that mean the sending unit is working properly?

I used an ohmmeter, touching the connecting bolt of the fan switch and a gounding point and the meter showed continuity. I was going to drain the radiator and remove the switch and run the test it shows in the Clymer. What do you think?
L8nliferydr is offline  
post #5 of 9 (permalink) Old 03-29-2007, 09:40 PM
HAWK
 
Ccspinner's Avatar
 
Join Date: Feb 2006
Location: Chicago land
Posts: 2,576
iTrader: (9)
 
Send a message via Yahoo to Ccspinner
You can test the sending unit without draining the radiator. as long as the temp is where is should be, not hot the reading should be the same as if it is out.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
Ccspinner is offline  
post #6 of 9 (permalink) Old 03-29-2007, 10:12 PM Thread Starter
 
Join Date: Mar 2007
Posts: 8
iTrader: (0)
 
I could not find directions on testing the sending unit. Do you have a link?
L8nliferydr is offline  
post #7 of 9 (permalink) Old 03-29-2007, 11:42 PM
HAWK
 
Ccspinner's Avatar
 
Join Date: Feb 2006
Location: Chicago land
Posts: 2,576
iTrader: (9)
 
Send a message via Yahoo to Ccspinner
I have it in the Clymers manual page 338. States that at room temp there should be no continuity between the 2 contacts. Put the sensor in hot water 201-212 F do not get the plug wet just up to the threads and should read 0.5 ohms.
If you run the motor you will get the same results as removing and heating in a pot of water/coolent mix.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
Ccspinner is offline  
post #8 of 9 (permalink) Old 03-30-2007, 12:27 AM
and the Adventure Cycle
 
hyperbuzzin's Avatar
 
Join Date: Jun 2004
Location: Western PA
Posts: 6,138
iTrader: (1)
   
Here's some resistance #'s from the Kawi service manual....
Attached Thumbnails
Click image for larger version

Name:	switches.JPG
Views:	29
Size:	55.9 KB
ID:	296  


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


"When life throws you curves,
Aim for the apex."

Author Unknown
hyperbuzzin is offline  
post #9 of 9 (permalink) Old 03-30-2007, 07:07 AM Thread Starter
 
Join Date: Mar 2007
Posts: 8
iTrader: (0)
 
Thanks to CCspinner and hyper. I will work on it this Saturday!
L8nliferydr is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

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
Display Modes
Linear Mode Linear Mode



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