Quote:
Originally Posted by G.M.
A thermostat does not have to seal tight when closed. In fact they should have bled holes so some coolant flows through when closed. This is important at starting as a completely close stat will put a head of air between the stat and
engine and take a long time to open. When a small amount of coolant flows through at startup warm coolant opens the stat faster. Has nothing to do
with the operation of the stat after it is open. G.M.
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Ok but if the thermostat has the bled holes in it should it close tight? And would the fact that thermostat is full open at around 165 and the other matching one is fully open at 175 mean that this one is bad. Or am I misunderstanding you