Yes, the intake manifold passes some coolant through the MAF. It'* a small hole so that it warms up the TB if you are in cold weather basically. This is one of the mods Grand Prix'* are doing is plugging up the hole in the throttle body so no coolant goes through and warms it up. This is so that the throttle body stays at the same temperature as the incoming air. After I took my throttle body off for the first time, it would not seal right and would leak too much. So I took epoxy and filled up the throttle body coolant passage and that worked perfectly. Now it never leaks since its contoured exactly to the passage and pushes a little into the coolant hole in the intake manifold for a water tight fit. It'* the perfect gasket since I have taken my throttle body off at least 10 times in one week and it has never leaked again. Hope that helps.
ADTR 1999 Black Bonneville SE
2003.5 Yellow Mazdaspeed Protege
2003 Azure Blue Mach 1 Mustang