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I always start with a pressure check. Pump it up cold to the cap pressure, see if it looses pressure. If so how quickly does it loose pressure? Down flow radiators sometimes leak above the coolant level and leak air cold and only loose fluid when hot.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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