I have a Gen 8, 2016 Hilux with 135K on the dial, It overheated the other day and went in to be fixed found the radiator was blocked with debris, so Toyota flushed, cleaned radiator and cooling system and replaced thermostat, and gave it a service
So get it back and 2 days later driving down road doing 80km ( 34 degree day) and the temperature gauge is fluctuating going up to max and then falling back down continually ) no matter what speed. Checked water level in radiator and its about a quarter full.
Going back to Toyota Monday but have questions has any else had this problem, could it be a another faulty thermostat, I checked engine oil its fine it was replaced in service but very black, where the hell is water going could not see leak and obviously wasn't boiling out radiator cap.
At a loss, its been serviced regularly.
Any suggestions would be helpful