Quote:
Originally Posted by Gunkk
Syphon/Suction/vacuum as the coolant cools down after the car shuts off. It's supposed to suck the expansion tank fluid (that expanded when it was hot) back up into the top tank. This is how all modern expansion tanks work. It's just counterintuitive with our cars because of the odd arrangement of our multi-tank setup.
I suspect yours isn't working properly because there is a small air leak in the tank that is breaking the syphon and preventing the suction mechanism from occurring, and thus the bottom tank fluid never gets pulled back into the top tank.
Hence why I think replacing the tank assembly will solve your problem.
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Are the OEM tanks as good as any aftermarket?
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2020 ZL1LE A10.
LME LT4 390 short block, LME CID Heads, Kong E2650, FBO.
15" conversion, MT ET Street R 325/15.
100 octane: 1045hp/1055tq.
100 octane + Meth (1x10+): 1117 hp/1067 tq
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