Originally Posted by tacr2man
toyota must have a reason for fitting the thermo where it is but could be due to emissions as that seems to govern most things these days .
So, it's likely that the long, detailed discussion in the link has no substantial errors (such as the direction of the coolant flow).
I wonder if any other Toyota engine designs have the same, or similar, location for the thermostat?
Maybe the replacement D-4D engine??
It seems to have the even longer name, the "1KD-FTV".
Originally Posted by JulianVoelcker
The bottom line is that the cooling system and head gasket are very sensitive on the 1KZ-TE so they need to be looked after. We have rebuilt three in the last month including our own being done now and all due to coolant leaks.
There's a lot of comment online about the 2.4 litre engine (as fitted in the "Surf" for example) with regard to head gasket problems, but this is the first time I have read about this issue with the 3.0 litre engine; it is also fitted in later versions of the "Surf" vehicles, I believe, + it is fitted in lots of "Colorados" and "Prados".
Does the D-4D engine suffer from the same sensitivity to the overall maintenance of the cooling system?