HELP I'm getting wet

[drtbiker]

it all happend last night it was hot and really humid and kinda driziling and i decided to use the ac well it worked great, Until when i decided to take it for a drive the next morning it was once again hot so i turned on the ac, well i took a turn and probally a half of gallon of very cold water came out of the vents on to my feet where there air normaly comes out,
-is this right?
-is it just because of the humidity
i keep my car outside but there r no leaks that i know of
also it was not antifreeze it was crystal clear and not stick at all and had no smell at all. Also i just had a new heater core installed a while ago but that wouldnt be the problem would it? I am very confused.
the car is a 87 mustang, gt 5.0 no mods other than gears, shifter and o/r h-pipe

thanks for ur time, much appreciated
-Raini