In light of the event of Engine coolant inside catalytic converter | PriusChat Is it normal that my PCU coolant is just right above/almost touching the low level line. My Prius is only at 17k km and it's less than a year old. Part #7
I think the dealership only fills it to the low level line at cold. If they were to fill it to the top, it would overflow when hot. So, as long as it isn't empty. Keep an eye on it.
Mine is a tiny bit below FULL - but the engine is hot - I've only been home a little while after a ½hr drive.
It should be between LOW when cold and FULL when hot, that's why it has two level indicators. If it's under LOW then it needs topping up (top up to Low level when the engine is cold), if it's over FULL then it is overfilled, if it's between then leave it alone.
Could be - but there is heaps of space above "FULL" for it to expand. Not sure if it expands as much as the engine coolant - you can touch the top of the inverter (just), you're not going to touch the engine when it's hot.
See callout ⑦ in the illustration in post #1. If it is low, go ahead and top it to the FULL line. At operating temperature it doesn't expand as much as kithmo thinks.
If the engine coolant reservoir is a little bit below the full line, when the engine's cold, should I top it off to the "B" line?
Only as one step in the process of refilling an empty system. It should end up at the FULL line once it has traded places with the air in the system.
I overfilled it when I changed the coolant on the PCU by about 1/4 inch over the full mark with everything cold, that was 40000 miles ago. There it sat, never overflowed and it’s been totally ok.
