Are you positive about this being for A/C flaps? The reason I ask is that the only time that the pump is active from this clear tubing line is when the transmission is in gear....what would this have to do with the A/C?

__________________
1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold