Dodge Cummins Diesel Forum - View Single Post - Thermostat seals
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post #2 of (permalink) Old 06-02-2019, 11:34 AM
Diesel Head
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The t-stat has two seals, an outer and an inner. It sounds like you only have one of them. Page 7-5 in the FSM has a good illustration.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
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