Passenger side bottom/back,, remove splash shield, insert flat head screwdriver into it and turn,, some say it's tricky, but I haven't had problems draining coolant. Get a haynes manual if you don't have one already.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
