If your temp guage reads normal forget it. The expansion tank on the turbo models is out of the stream. It will only get heat from the direct transmission of heat through the coolant as it does not circulate to it...

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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.