Hi all, Just signed up.
I bought my Prius a month ago and love it.
4 days ago I was driving home and noticed the engine temp light was on. Popped the hood and saw the engine coolant reservoir almost completely empty (Perhaps it can never completely empty while in the vehicle due to the position of the hose). Bought some 50/50 put it in and light goes off.
Yesterday evening, after putting 150 - 200 miles on since last adding coolant, temp and check engine light came on. Popped the hood, reservoir almost empty and droplets of coolant on underside of car, however not dripping on ground. Got Engine code P0117 - ECT sensor. No sign of leakage at sensor. I figured first I'd address the low reservoir issue.
Took off splash shields, found a few droplets between the engine and the firewall (driver's side) and on those plates under the cat. Added coolant, ran motor, and could find no leaks. The reservoir was again almost empty so cycled thru running the motor, letting it cool, and adding coolant. There was a horrible sound coming from the water pump when the engine shut off and the car was still on, but this went away as I added more coolant. At this point I assume the P0117 code came up due to air in the system. Used 3/4 gallon 50/50. Still not seeing any leak.
Checked oil - looks fine, the exhaust heat exchanger had already been disconnected, some condensation at tail pipe but no sign of coolant. Seems like that rules out internal leak
So uh yeah kinda stumped.
