On the 1992 and 93 models, it is accessed from the rear radiator door. It is about two inches below the top on the passenger side of the radiator. It looks like a bolt sticking out of the radiator.
Note that I updated my post above to show that Detroit Diesel recommends EITHER a 7 psi OR a 9 psi radiator cap. That's what I get for going from memory (forgot the 9 psi cap) instead of checking the manuals.
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