Anitfreeze is dripping on to my passenger side floor.

After diving for a few minutes with the max AC on, antifreeze was leaking. It wasn't hot because I didn't have the heat on. Under the hood, I couldn't see any leaks coming from the heater hoses, blower box, or heater. This exact same problem happened to my friend's 89 GTA. What should I do? Do you think I have to replace my heater core? My car has 150K miles.

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92 RS carb'd 357 5-speed T-tops maroon w/ black cloth interior
650 cfm Double Pumper, stealth intake, dual 12" radiator fans, 10" auxiliary pusher fan, 5" X 12" power steering cooler, 204/214 cam duration @ .050", 420/443 valve lift, 1.75" headers, no cat, 3" PaceSetter catback w/ dual 2.5" tailpipes, 3.73 gears, posi, 245/50/ZR16's up front, 255/50/ZR16's in back
2.070 60 ft, 9.9 @ 71 (1/8), 15.4 @ 87 (1/4) <--old times
100% American (you damn right)

You sure it's antifreeze? On many vehicles there is a hose that carries off moisture condensed from a/c system on passenger side. If it pops loose, it will leak on passenger footwell instead of going outside.

If it is antifreeze, your heater core is leaking.

It's heater core time.

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1990 camaro rs

never raced it because, well its slow.

I would find the inlet and outlet to the heater core and flush it with water to get the antifreeze out. Next, put a little pressure (< 15 psi) into the lines and see if water seeps out. At that pressure, it should hold all day long without problems. It may just be the hoses not the core itself. If you have to replace the core, do the hoses too. I did not do it on another car and found out that the core was good while the hoses had a leak in it. Guess what: "One more time, Baby"

STOP! Don't automatically think it's the heater core. The evaporator drain may have plugged up, dumping condensation into the passenger compartment. Run the car for awhile without the AC. If the liquid stops dripping, it's the drain tube. If it continues to drip, chances are it's the heater core. You also stated after a few minutes of driving - implying hot coolant - and the liquid was not hot, tells me it's not coolant.

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1985 Z28, Jasper Class 1 350, Edelbrock Performer intake, Dual snorkel air cleaner w/K&N, SLP 1 3/4", Catco cat, Hooker cat-back, built 700r4 w/ Darrell Young 2400 stall TC, Jet stage 2 chip, SSM subframes, Lakewood LCA's, Powertrax locker w/stock 3.23's, GM 17x9 ZR-1's with Nitto DR's