Join Date: Sep 2009
Location: Killeen, TX
Thanked 1,796 Times in 1,578 Posts
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
If you are lucky enough to be in Texas, you are lucky enough.