Coolant overflowing the overflow container.
SEE PICTURES ON PAGE TWO OF THE THREAD. SEE PICTURES ON PAGE TWO OF THE THREAD. 2016 Toyota Sienna with 15,000 miles. Coolant has appeared on TOP of the overflow tank since the van was new. I...
Forum Discussion
Grit dog wrote:
From your pics and descriptions, sorry I'm not familiar with the particular vehicle, that is just an overflow container and not pressurized, correct?
It is only connected to the radiator overflow (small hose) by the radiator cap, correct?
Have you looked to see if it's near full when the engine is hot?
Does the vent line from that plastic cap just come out of the cap, or does it run to the bottom of the tank inside the tank? Or is the hose in the cap the one coming from the radiator?
It doesn't look like that cap in your pic is designed for pressure (wouldn't be if it's only overflow), therefor it wouldn't be water tight. But that brings back the concern that something is over pressurizing the cooling system and filling the overflow tank all the way up.
It is not pressurized.
The vent line just vents to the engine compartment and doesn't go back into the system.
I just got back from a 40 minute drive and lifted the hood. The coolant level in the overflow tank is 1/2 inch below the full line.
