Originally Posted by
timsrv
The engine coolant circulates in a closed system, so if you're losing coolant then there's a leak. No big deal as long as you add prior to it getting low, just a hassle. It's not unusual for the coolant recovery bottle to leak from the bottom, so check that. There's a rubber grommet there that gets soft and falls apart. Unfortunately the only way to get that grommet is to purchase the coolant level switch & that sells for ~$100 from a discount Toyota parts site (MSRP is more). If your engine light is coming on that means there's a code stored. Put it into the diagnostic mode to see what it is. Tim