Overheating - 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!

 3Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 (permalink) Old 10-15-2015, 05:07 PM Thread Starter
Senior Member
 
Join Date: Feb 2012
Posts: 579
iTrader: (0)
 
Overheating

Last night I took my bike out and the bike ran hotter than it normally does at least on my bike. I am not sure but I think temp sensor is working correctly as the fan will turn on in the middle of the night. So i have to unplug the connector at the base of the radiator.

I opened my reservoir and it was boiling thinking this isn't what it is suppose to be doing.

Please point me in the direction to troubleshoot this. Not too familiar with this.

Grace and Peace to you!
Richard
mrseedsower is offline  
Sponsored Links
Advertisement
 
post #2 of 23 (permalink) Old 10-15-2015, 05:29 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,459
iTrader: (5)
 
well, the fan running in middle of night (going to assume the engine is cold), and pulling the wire on the radiator stops it from happening.. thats a bad fan switch (in all likelyhood).

overheating...

temp guage is a different sender, mounted on the thermostat housing (right side of frame, up under tank/right neck cover). what was it reading when you looked in the coolant tank?

thermostats do fail on these, and there is an 'automotive' application that is a direct replacement, but I forgot what one it is. sure someone will chime in here.

2005 VN750

Sold 11-27-17
michiganteddybear is offline  
post #3 of 23 (permalink) Old 10-15-2015, 05:44 PM
Old Truck Junkie
 
niterider's Avatar
 
Join Date: Jul 2007
Location: Roby Texas
Posts: 4,130
iTrader: (15)
 
Is it the ford pinto thermostat?

02 honda sabre 1100
niterider is offline  
 
post #4 of 23 (permalink) Old 10-15-2015, 07:05 PM Thread Starter
Senior Member
 
Join Date: Feb 2012
Posts: 579
iTrader: (0)
 
Ok I took my bike out today andit stayed pretty much in the right place on the thermostat reading. I stopped my bike at a friends house and left it running. it began to overheat and water began to pour out the bottom. The reading was close to the read part of the gauge. The fan was running. After I got back on the bike and riding a bit it cooled back down.

The question I have it this. Can the thermostat not open and the sensor still work right. Also can the engine cool down alone by riding and cooling the fins with air and the thermostat still not open.

I haven't had this problem until last night.

Grace and Peace to you!
Richard
mrseedsower is offline  
post #5 of 23 (permalink) Old 10-15-2015, 08:04 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,459
iTrader: (5)
 
Quote:
Originally Posted by mrseedsower View Post
Ok I took my bike out today andit stayed pretty much in the right place on the thermostat reading. I stopped my bike at a friends house and left it running. it began to overheat and water began to pour out the bottom. The reading was close to the read part of the gauge. The fan was running. After I got back on the bike and riding a bit it cooled back down.

The question I have it this. Can the thermostat not open and the sensor still work right. Also can the engine cool down alone by riding and cooling the fins with air and the thermostat still not open.

I haven't had this problem until last night.
yes, riding it can cause temp to go down, but not by cooling the fins on the engine. its the air thru the radiator that cools it down when riding. the fan alone is not always enough to keep it cool, when going low speeds or stopped.

temp sensor can read correctly regardless of the thermostats position or condition (bad or good). its on the 'hot' side of the thermostat if I recall.

if riding causes it to cool down, then look at a partially plugged radiator, causing less coolant to flow at idle (riding is done at higher rpms than idle, and therefore there is more water flow avail to go thru the radiator).

if the fan is cycling on and off properly (and if the radiator is doing its job it should cycle, even at idle), then the only thing that can really cause your issue is either a plugged (internal, or external, check the front for debris) radiator, or a failing thermostat (probably stuck partially open, or wont open fully).

I suppose a water pump thats marginal could do it, but thats pretty much a stretch, since when its ridden, it cools.

all of this is of course assuming there are no air bubbles in the cooling system

2005 VN750

Sold 11-27-17
michiganteddybear is offline  
post #6 of 23 (permalink) Old 10-15-2015, 08:39 PM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,888
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
If the radiator fins are plugged get condenser coil cleaner for refrigeration units.they have it at Lowe's

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is offline  
post #7 of 23 (permalink) Old 10-15-2015, 09:44 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,631
iTrader: (5)
   
Replace the bad fan switch first.

35 mph or better would keep mine cool in hot weather, but any stops at red lights would heat it up quick without the fan.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #8 of 23 (permalink) Old 10-16-2015, 02:54 AM Thread Starter
Senior Member
 
Join Date: Feb 2012
Posts: 579
iTrader: (0)
 
The fan is working. It just has a mind of its own. But I do want to make it work correctly. So where is the fan switch or is it the piece that is near the thermostat?
mrseedsower is offline  
post #9 of 23 (permalink) Old 10-16-2015, 07:18 AM
Members who have donated towards server costs
 
JM2001's Avatar
 
Join Date: Mar 2011
Location: Rochester, New York
Posts: 1,803
iTrader: (1)
 
Quote:
Originally Posted by niterider View Post
Is it the ford pinto thermostat?
See my post # 9
https://www.vn750.com/forum/31-engine...hermostat.html

JM2001

" Loud Pipes Risk Rights "

2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier
JM2001 is offline  
post #10 of 23 (permalink) Old 10-16-2015, 08:32 AM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,459
iTrader: (5)
 
fan switch is the one on the bottom of the radiator.

temp gauge sender is in thermostat housing

2005 VN750

Sold 11-27-17
michiganteddybear 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