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...
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Have you checked for a coolant leak after a short drive before the thermostat is fully open? A sticky thermostat could cause a temporary pressure increase. I'm wondering if that excess pressure then allows coolant to get past the gasket on the recovery tank.
If not a cold engine problem, then maybe you get a lot of turbulence when the thermostat is fully open which increases pressure and allows leakage at the tank. I say this because back in the day when we would run an engine without a thermostat we would get a better result if we installed a restrictor plate. Not suggesting you do that but it gives you an idea of the turbulence that can develop. I would think the radiator would dampen the turbulence but, for me anyway, the proof was in the pudding.
In any event, I also wonder about the neck of your recovery bottle and it's ability to hold back the coolant - a rough spot, a burr, etc. Before you swap out the van you might want to just swap out that whole assembly - bottle, cap, hose - and see if that helps.
Have you peeked under the hoods of other similar cars? Is it a common problem?
Hope that helps. Good luck.
If not a cold engine problem, then maybe you get a lot of turbulence when the thermostat is fully open which increases pressure and allows leakage at the tank. I say this because back in the day when we would run an engine without a thermostat we would get a better result if we installed a restrictor plate. Not suggesting you do that but it gives you an idea of the turbulence that can develop. I would think the radiator would dampen the turbulence but, for me anyway, the proof was in the pudding.
In any event, I also wonder about the neck of your recovery bottle and it's ability to hold back the coolant - a rough spot, a burr, etc. Before you swap out the van you might want to just swap out that whole assembly - bottle, cap, hose - and see if that helps.
Have you peeked under the hoods of other similar cars? Is it a common problem?
Hope that helps. Good luck.
