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Final report: it's been about a week of regular driving including up to 90 mph in 105 F temperatures and no recurrence of coolant venting....
Of course. I don't know why that didn't click before. The split yellowish-white coating on the magnet is probably something like (or actually...
I took the pump apart and the impeller vanes are ok. It's the off white plastic coating around the magnet that failed in three places (two on one...
It doesn't drain the whole system when removing the pump. A full drain and fill takes about a gallon..
I changed the pump. Prior to doing so I had a couple of days with no apparent venting from the reservoir cap and no apparent decrease in the...
I am definitely changing the pump and appreciate everyone's help and opinion. This forum has been far more helpful (and cheaper) than the Toyota...
I have the same reservations you are but it may be that the coolant is circulating just not at an adequate flow rate if the pump is failing....
Thanks for the info. There's no apparent oil level increase. I haven't done the blotter test as I was not familiar with it but will do so. Thanks.
I would have thought the Toyota Techstream software would have detected a failure there but maybe not.
I appreciate your response. I'm curious as to why the pump causes that but will likely give it a try. Seems like the pump is a frequent failure...
The car: 2015 Prius Four 127000 miles. All routine maintenance done on schedule. No accidents. The problem (short story): Coolant loss from...
