I would not use foil tape anywhere that gets heat, and could cause problems later on. the glue on the back will crystallize and diamond hard particles could be sucked into air stream or oil stream. not to mention it will fall off.
not sure what would be good to use, but perhaps jb-weld? John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!