Dex cool flush...Best way? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-08-2008, 12:56 PM   #11
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Thanks, this will help a lot. Looks like I am going to do it either this weekend or the next (the weekdend before we go to Bill'*).
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Old 04-08-2008, 01:19 PM   #12
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180, Matt. Not 160. Drill one small bypass hole in the rim just inside the rubber seal.
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Old 04-08-2008, 01:43 PM   #13
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What is the purpose of drilling the bypass hole?
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Old 04-08-2008, 02:25 PM   #14
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Quote:
Originally Posted by parajumper1405
What is the purpose of drilling the bypass hole?
It functions as an air bleed - it allows trapped air from the intake manifold to easily pass out of the engine. The hole should be placed at the 12:00 O'Clock position in the thermostat housing when you install the thermostat.
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