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Message: <blockquote data-quote="Lee12609" data-source="post: 762314" data-attributes="member: 12415">you MUST run a thermostat or a restrictor plate atleast.without a thermostat the car will run cool for a short period of time, but the coolant wont stay in the radiator long enough to cool after so long it only gets hotter and hotter.  i know this because i just tried it last week on my car. it was fine for 15-20 minutes of cruising, then it started to creep up and up and up. installed a NEW 165? thermostat and all is good. i should say that my car is a 96, is boosted, and tuned to turn the fans on at a lower temperature... just so nobody says "that thermostat isnt doing any good"....</blockquote>