Notes on Changing the Coolant - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 1 (permalink) Old 01-15-2006, 09:33 PM Thread Starter
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Notes on Changing the Coolant

Manual says to remove tank (which is not a bid deal, have done that many times)... BUT, it's not needed. The bleed valve can be adjusted without taking off the tank. Thought this would save someone some time. Starman.
Overheating after Collant change?

You may not have an overheating problem the way it sounds to me. You may have just overfilled your expansion tank. The expansion tank is the tank that you check the liquid level for the anti-freeze on the right side of the bike. This is how it works; In the old days when your engine would heat up the anti-freeze would expand, the anti-freeze would drain out of a tube at the radiator cap and on the ground. You had to fill up the radiator more often because of this. They have put in the expansion tank to catch the anti-freeze when it expands and begins to overflow when the engine in hot. When the engine cools back down the cooling system acts as a vacuum and actually sucks the ant-freeze in the expansion tank back into the system. When you look at the expansion tank you see that the full level is at a low position on the tank. This is because this is what the level should be when the engine is cold. If you fill it up higher then that level then when the engine heats up and the expanded fluid go to the tank it can overfill and go out the tube and onto the ground. Now that you see how that part of the cooling system works, you will understand my point and advice that you should always check your coolant level in the expansion tank ONLY when the engine is cold. and ONLY to the full mark.

Cooling system flush?

That's what I did. No need for a power-flush. Just take out the drain bolts from the cylinder sides and bottom of crank-case, and pour water through it. I left the bike off. Then I use a automotive coolant that is silicate free and marketed as a long-life coolant. Both Prestone and Texaco make this stuff and it will carry the name "DexCool" on the label. This stuff is dyed red to orange. DexCool type coolant is increasingly being specified by new car manufacturers and, being silicate free, is safe for motorcycles. The good news is that you can buy a gallon of it for about $7. Starman.

DON'T MESS W/ THOSE COLLING SYSTEM DRAIN BOLTS.! You are looking for trouble. Something is going to break. No reason to drain from them. Drain from radiator drain (there is one, I guess) and from the reservior. Don't get nuts about thinking you have to get every little drop out.
Mild disagreement, here. I removed mine to drain my 1990 when I first got her. No problem. More old coolant came out than I expected .... even after I'd drained from the other plugs. Just changing regular coolant, maybe not necessary, but I've read you're not supposed to mix Dexcool with ordinary stuff. Joe, I don't have pics, but can tell you they're pretty easy to find ...I just referred to my Clymers. JMO grambo
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