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Originally Posted by rightstuff4u  Thanks for posting that diagram. The tank in question is pictured as item 1A. The hose runs from the pressure cap on the reservoir down to the tank, which is tucked under the plastic skirt on the inside of the front tire fender well. It sits next to the windshield washer tank.
My question is, should this be emptied? How? And why does it fill in the first place? |
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