1996 Dodge Avenger

Hi:
If you replaced the t-stat and it still overheats, have you considered flushing the radiator and engine block? That would be my recommendation. Why do you think there is a crack in the manifold? Is it leaking? To have it welded, (If in a location that can be repaired) would require someone who can weld aluminum. Also, check to make sure the head gasket isn't leaking. The rear ones have a reputation of leaking on the passanger side rear.

Let me know what you find.

Joe