Temp getting too hot at stop lights - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 19 (permalink) Old 03-20-2011, 04:51 PM Thread Starter
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Temp getting too hot at stop lights

I have a 2004 vulcan 750.The bike runs great and cool when you are going down the road.Soon as you come to a couple of stop lights it heats up and the fan kicks on pretty quick,even in cool wheatherIt never used to do that,does anyone have any addvice for me,Thanks Tom
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post #2 of 19 (permalink) Old 03-20-2011, 05:08 PM
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Is the coolant level full??
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post #3 of 19 (permalink) Old 03-20-2011, 08:41 PM
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I've also read that if the coolant is more than a 50/50 mix, it lacks some cooling potential.

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post #4 of 19 (permalink) Old 03-21-2011, 10:07 PM
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Mine does the same thing. I installed a new thermostat thinking that was it. No difference. Im thinking either radiator need to be cleaned, or temp sender off and it really isnt that hot.
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post #5 of 19 (permalink) Old 03-21-2011, 11:52 PM
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The temperature gauge sending unit operates totally separate from the coolant fan switch, so if the gauge needle rises and the fan comes on they are both working as they should.

Is there any coolant in the overflow tank?
Is the rest of the cooling system full?

The temp gauge rising also indicates that the thermostat is opening and letting some coolant circulate to the radiator. There may be enough coolant to submerge the temp sending unit and fan switch mounted low on the (edit: left side of the) radiator, but not enough to fill the rad core and cool it efficiently.

(Edit, Mar24: Correction- The temp gauge sending unit is under the tank on the thermostat housing, not on the rad.)

`86 has a point too. Antifreeze is most efficient at a 50/50 mix with distilled water.
If straight antifreeze is installed in the cooling system it may act like these symptoms.???
Don`t know for sure as I have never seen it done or heard of it done before.
Check specific gravity of the coolant in the system to determine strength of mixture.

As L2fish says, it is also possible the rad is plugged. If the end tanks can be removed from the core, it may need to be rodded out at a repair shop.

That`s all I can think of now.

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post #6 of 19 (permalink) Old 03-22-2011, 01:54 AM
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Straight anti freeze will run hotter than the 50/50 mix. It doesn't have the cooling capabilities of the mix. Usually with it heating up that quickly at a stop is an indication that the coolant level is low. It is the same way in a car.
Does it cool back down when you get to moving again? If it does is it cooling down fairly fast? Or cooling a little slower?
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post #7 of 19 (permalink) Old 03-22-2011, 07:56 AM
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If you are out of the freezing temp time where you are, drain and flush your cooling system. Then fill with distilled water & Redline water wetter(or similar). Has all the properties needed for cooling system, is aluminum safe, and transfers 50% more heat to the air than water/AF mix.

The 750 needs lots of moving air to work, slow riding or frequent stops do not bode well with it.

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post #8 of 19 (permalink) Old 03-22-2011, 11:51 AM
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Down here in the desert I ride in a lot in high winds. I have noticed that when riding with a heavy tail wind (30+) my temp goes up quite a bit after about 10+ miles. When I turn crossways to the wind the temp comes back down. Gotta have that flow across the radiator I guess.
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post #9 of 19 (permalink) Old 03-24-2011, 07:43 PM Thread Starter
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It cools down when you get moving but not very fast.Do youknow what the sensor at the bottom left side of the radiator does?I know the top sensor by the thermostat is for the fan.I wonder if the bottom sensor has something to do with the temp problem.What do you think?
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post #10 of 19 (permalink) Old 03-24-2011, 08:34 PM
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Quote:
Originally Posted by 19tomc69 View Post
It cools down when you get moving but not very fast.Do youknow what the sensor at the bottom left side of the radiator does?I know the top sensor by the thermostat is for the fan.I wonder if the bottom sensor has something to do with the temp problem.What do you think?
The sensor on the lower left side of the rad is the cooling fan switch.
The sensor on the thermostat housing is the sending unit for the temp gauge on the dash.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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