Quote:
Originally Posted by jacob smith
A have 2 barrel type thermostats for use in a 36 ford. I teasted them in water. One has a tight seal and opened up at about 175. The other does not seem to close tight and fully opened at about 165. Am I right to say that the thermostat that does not close tight and is not good.
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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.