First of all the air gap probably got screwed up when the temp spiked (unless you refilled after that). Dumping coolant can just be a function of that, it doesn't have to be a major problem.... Then you have the fan (newspaper/ water pump (is the coolant coming through the bleed hose to the expansion tank when you remove the cap) or maybe the thermostat - but for me, and I messed around with all of those things, before finally replacing the rad.... You cd try back flushing the rad to see it it helps, but if any PO has ever put additive in the rad it most likely will be f***D. I did a post mortem on my old rad and half the galleries were completely clogged, so the ram air does not cool the rad as it should (and in that case the fan won't either, when it kicks in). That showed up as occasional overheating in slow traffic situations. You lose nothing from a god back flush fnar fnar
