Temp gauge climbs slowly. Normally it stays at one line below the 1/2 point but yesterday it got to one line above the 1/2 point. I stopped, bought some coolant and topped off the overflow tank. It didn’t need any but thought I’d top it off anyway. I'm sure most of it spit out from being over full. Rode 30 miles home with the heat gauge still reading high and even climbing just a tad. I let the bike sit overnight and took off the radiator cap this morning. I saw no liquid at all. I managed to get in 5 cups of distilled water before the level stayed. I then started the bike and let it idle for about two min. The fluid level dropped but, more importantly, I saw water dripping under the bike. Okay, so there is a leak somewhere and I’ll pull of the belly pan in the morning and try to track that/those down. However, the overflow tank is still at the proper level!!
So, my question is, why would I be losing liquid level in the radiator but still maintaining the correct level in the overflow tank? The over flow hose is not blocked. I took it loose at the top and blew through it with no resistance at all. Shouldn’t the radiator be sucking fluid from the overflow tank?