A/c is leaking a foul smelling liquid on the passenger side floorboard

It's a brownish color definitely..It smells like a stinky ****,lol It's a brownish color definitely..It smells like a stinky ****,lol

If your A/C still working good, with cold air, won't be the A/C system leaking because it would leakout in a second and you would lose your cold air ! It sound to me, that your heater core is leaking in the airbox and leak out on passenger side ! Seem's to be Old Coolant, DexCool ( Orange Coolant ) is stinky when it's old, if you replace the Heater Core, replace the whole Coolant, normally it's good only for 5year's ( Dexcool Orange type ) and 2-3 Year's ( Green or Yellow Type ) ! After that they become acid and eat everything is called aluminium such rad and heatercore lol ! If your A/C still working good, with cold air, won't be the A/C system leaking because it would leakout in a second and you would lose your cold air ! It sound to me, that your heater core is leaking in the airbox and leak out on passenger side ! Seem's to be Old Coolant, DexCool ( Orange Coolant ) is stinky when it's old, if you replace the Heater Core, replace the whole Coolant, normally it's good only for 5year's ( Dexcool Orange type ) and 2-3 Year's ( Green or Yellow Type ) ! After that they become acid and eat everything is called aluminium such rad and heatercore lol !