When the coolant is Cold, the level in the Expansion Tank NEEDS to be somewhere below the Max level, ie low enough to allow the coolant to expand when the engine starts running & the coolant warms up! Which means that effectively, anything above the Low level is fine - but if you're level is up at Max already, then the coolant is gonna overflow when the engine gets warmed up. :dontknow:
It's not really a biggie if your expansion tank is topped up to the Max level once, just so long as you don't then panic about any coolant that might drip off the underside of your Spyder while it's parked! If the coolant level is too far above low/close to Max cold, then there's going to be some coolant expelled from the expansion tank the next time the engine warms the coolant up, & some will likely be caught in the placcy trays & underbody panels, probably also in the frame etc as it drains away. That means that once you've parked your Spyder & any trapped coolant drains out, you'll probably get to see a few little puddles under your Spyder over the next day or so. But if you don't top the coolant up again to that overfull level once all that has happened, it should only happen the once! The coolant level in these expansion tanks is 'self-regulating' thru the cold/hot coolant cycles, just so long as there's no leaks etc & the cold level is above the Low mark! The trap is in seeing the coolant puddle, noticing the level is now a little below Max, thinking it's too low & topping it up to the Max level again! That just repeats the overflow & drain cycle & often leaves coolant puddles under the vehicle. I've seen people panic about their 'leaky expansion tank' or cooling system pay hundreds of $$ to get it fixed when there was nothing wrong but their over-filling in the first place!! Some workshops/dealers will simply take advantage of your lack of knowledge, while the more honest places will just tell you that you've been filling the expansion tank too much & probably only stuffed the cap over time by doing so!
You don't need to fill your Coolant Expansion Tank to the Max level, anything above the Low mark is fine! :thumbup: