It's supposd to be the same engine as the new Corrolla.Maybe they fixed the issue on later models.Glad you got it sorted.
Is there an engine temperature gauge on the new Prius?
If not an OBD reader will allow you to monitor the coolant temperature if it's a concern.Bit fiddly but ya can look into it.
Yea merc ther wud have to be a temp warning sensor...but thers no low coolant warning device fitted

..... ...the main symptom is heater not working apparently....
Mine was a gurgle I heard in the heater ( heater still working) after parkin up an I checked the reservoir ...it was low ..
So far coolant has remained at full but havnt done lot drivin ..
