Quote:
Originally Posted by phattyduck
No, there is a bypass hose that always pumps water past the 'active' size of the thermostat.
The jiggle valve is traditionally for bubbles, as has been stated. There is something about the 5VZ design where the orientation of the thermostat matters that is different than most engines... I have not seen a good explanation, but I have seen lots of engines that run a bit too hot fixed by rotating the thermostat though.
-Charlie
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There is a bypass hose, but without the flow through the jiggle valve it would be difficult for hot coolant to reach the thermostat and open it.
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