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Old 10-18-2020, 04:55 PM   #18

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Drives: 2016 2SS Convertible
Join Date: May 2012
Location: St. Louis, MO
Posts: 1,341
Originally Posted by LSA View Post
Granted, it’s off topic a bit.... but the question remains.

If you attempt to apply vacuum to the upper chamber, it seems as though the lower chamber would “leak”..... let air in. Wether through the cap or the vents.
There is a hidden fill tube between the chambers that is built into the tank. The fill tube runs from the large cap on the upper chamber down to the bottom of the lower chamber. Excess pressure and air/coolant is pushed up through the pressure relief valve in the large cap. It is then vented into the lower chamber through this fill tube. When the engine and coolant cool it pulls vacuum from the upper chamber through the fill tube to the bottom of the lower chamber. That will draw coolant (if available) from the lower chamber back up into the upper chamber.
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