Join Date: Mar 2014
Location: Fort Collins Colorado
Mentioned: 0 Post(s)
You didnt mention how many miles you've ridden since your last change, so assuming it's time, definitely do the flush and change. Unless your coolant is very old or you put in a very low ratio of coolant:water, your coolant should not be boiling over. I assume your ratio is the nominal 50:50 (I run 40:60) and your boiling point should be at least 260*. Your system is a closed/pressurized system and evaporation should never be an issue.
If you're losing coolant, you're likely leaking it from one connection or another, or from your drain bolt. Check for signs of a leak. Most coolants will leave a crusty or powdery substance at the hose connection or under your drain bolt. Also check the rubber hose that connects to the bottom of your reservoir and runs to the top of the radiator, next to the fill cap.
For the boiling issue, check and verify that your fan is coming on. Let it idle and after about 5 minutes the cooling fan should kick on. If it is, your thermostat should be working correctly. If the fan doesnt come on, replace your thermostat.
I highly recommend Zerex G-05 Coolant 50:50 mix or 40:60, but not less than 40:60 coolant to water ratio. Be sure to use distilled water. The G-05 is at Napa for $14.99 per gallon. It looks and smells like Tequila.
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Last edited by Backroadie; 04-20-2014 at 07:26 PM.