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Originally Posted by Brett San Diego  Ah, I see. In that case, you most likely have a failed coolant reservoir cap. It is no longer holding pressure. I checked the passages on mine to confirm, and coolant only reaches the overflow tank by passing through the pressure relief in the cap (or around the cap seal). The coolant trip to the overflow is one-way. Under normal conditions, it should be completely empty. The tank is there only to catch abnormal overflow from the cooling system.
There are multiple reasons why the cap may not be holding pressure. 1. The valve built into the cap is defective. 2. The O-ring on the cap that seals against a smooth surface where the cap screws into the coolant reservoir is damaged or missing. 3. The sealing surface in the coolant tank orifice is damaged. For 1 and 2, a new coolant cap should solve the problem. For 3, it would take a new tank, unless you can rectify the damage in some way.
Brett |
I figured it was supposed to be empty but wanted to understand why it filled in the first place. What's really odd is that the engineer that created this car didn't give me an option as to how to empty it. Removing the tank is a real pain. And there is only an inlet hose. The outlet is just a hole in the top of the tank. There is no way to empty it. I guess I'll have to siphon it out.