The first thing to try is tightening the clamps. These hoses are very high quality from the factory and do not need replacing all that often. If that does not work you may be able to get it out without removing the stat housing. The old hose can be cut if necessary to get it out and you may be able to wiggle and fold the new one to get it in.

I have had at least 30 old benzes and cannot remember for sure about how to replace this hose so that gives you an idea how seldom they go bad.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.