Go over everything you removed or altered when t/s the AC.
Make sure you are in neutral or park .... yeah I know
If it was running great, up till you t/s the AC, then it should still be, if however there is a time lapse between running great and trying to start now, then you have battery checks, earth wire checks, starter connection checks, etc
1989 200 Turbo quattro Exclusive
1989 200 Turbo auto
1987 100 CD white, 1987 100 grey, 1986 100 red.