Clogged HVAC drain

dreain is located under the hood in engine compartment on firewall area on passenger side of vehicle, look for a rubber looking hose down low on the firewall, normally you can remove hose and clean drain by blowing air in tube or sometimes crrap collects in the rubber tube, tube should pull right off, i have sneeped off end of the rubber tube so it has a bigger hole to drain and not plug up again

Sounds like the HVAC compartment drain is clogged. It is located on the firewall in the engine compartment, on the passenger side. It is a short rubber hose, clean it with a piece of wire hanger or a pencil.

It sounds like the evaporator drain tube is blocked or came off the duct inside, pull the carpet back and locate the rubber drain hose on the bottom of the evaporator housing, the hose should go through the firewall so water can drain out, the hose may have become disconnected before the firewall or it come off at the evap housing, pull the hose of the evaporator if water comes out make sure the hose goes out through the firewall and is not clogged.

you have a clogged drain for the heater/AC box
go under car safely, and find rubber hose and clear all debris

The evaporator drain might be clogged. Get under the truck or open the hood and look for a rubber nipple coming out of the firewall on the passengers side. Try sticking something in this hole to release whatever might be stuck in there, usually leaves or sediment. Be careful, don't go crazy pocking something in there. The evaporator core might be near the drain hole, you don't want to poke a hole in it.

PROCEDURE:
(1) Get under truck from passenger side;
(2) Look near front (engine) end of transmission -- there is a rubber pyramid-shaped piece without anything else near it (see picture one). This is the drain nipple.
(3) To clear a clogged nipple, use your finger or a small tool to wiggle the nipple until the mud, dirt, debris, etc. is freed, allowing water to flow out. This water is dirty and may be warm.
(4) Allow water to drain out, attempting to dodge as much as possible.
(5) Check periodically to ensure water flows from the drain line, cleaning as necessary.
(6) Wipe arms off with towel.

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under the car at the base of the firewall on the passenger side..

no thats your heater core look a little lower almost to the floor board

under the passenger side firewall at the bottom by the floor board youll see a rubber hose or nipple, shove a rod or coat hanger inside hose until you see nothing but clear water run out. you may even use the good old water hose to flush it out
good luck

It should be located on the passenger side firewall.Just follow your a/c lines until they enter the firewall of your car,have a flashlight handy and look for a piece of black rubber sticking out(maybe 1" dia.and black.Once you locate it use a stiff wire or small stick to go into the opening and move it around to see if it is clogged.