Quote:
Originally Posted by Tango Charlie
I think most thermostats have a small hole in them so they still circulate a small amount of coolant when closed. At least the thermostats that I've seen.
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Most of the older cars did not have that feature. I know that the first one I saw was on my 94 Plymouth Sundance Duster....reason for it was to not have as many head gasket failures due to the big temp differences of the water coming in when the thermostat opened up. Since 81 I used to always drill a couple or three 1/8" holes in mine.