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That top pipe coming out of the flask is feeding the return pipe to the engine is it not? So by my reckoning, the flow control valve coloured green is to divert coolant away from the flask to the radiator when the flask is up to temp. It would then switch over and take hot coolant from the flask to the engine upon starting. There would be some software responsible for that i'm sure. The lines feeding the rad arent shown but i'd say they connect to that green valve somewhere.
That return pipe on the front of the engine is the exact same as on my yaris. It returns coolant from the cabin heater and in fact, the branch off that to the top of the flask is also on the yaris. Only on the yaris its for the external block heater that prefers to dump heat into the radiator......hmmm..
So it might be worth getting a scrappy valve and flask off a prius?
ollie
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