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You didn't say what was leaking, water or antifreeze. If it is water dripping, your drain tube from the AC evaporator compartment is blocked. Clear that and the condensation will drain outside the car. If it is antifreeze, your heater core has a leak and will need to be replaced.
If you have been running the AC for a while and the humidity is high, the condensate drain tube is plugged which will cause water build up to eventually leak into the passenger compartment.
If you have a rear a/c unit look behind the passenger side wheel well. There will be 4 a/c lines going up to the condenser on the floor board. In that area there is a 1/4 rubber nipple that will appear closed and flat. work it between your fingers to loosen gunk, then put a wire or screw driver in about 12" and it should free any clogs
HEATER CORE AND AC EVAPORATOR DRAIN TUBE STOPPED UP ALLOWING AC CONDENSATING WATER OR SWEAT TO RUN IN FLOOR BOARD.OR LEAKING HEATER CORE WILL CAUSE WATER OR ANTIFREEZE IN FLOOR BOARD.
The evaporator box drain is stopped up.Under hood,under the firewall,right below the ac lines,you will find the drain.Take a small wire,like balin wire and move it in and out of the drain hole to relieve the water,it will pour out pretty good.If this doesn`t work,try compressed air pressure.I hope this helps.
the ac drain is more than likley stopped up, they tend to get clogged with debri not allowing the condensation from the evap. core to drain properly, thus allowing it to leak into the floorboard.
The condensation tube is blocked more then likely, a shop can unclog from underneath for about 30-40$. It is usually located near where the a/c aluminum lines enter the firewall if you want to attempt it yourself. If the line is not blocked then the evap box probally has a crack in it and will need replaced
check your heater coil under the dash on passanger side for leak at joint areas. it could be condensation from the AC condencer dripping down the line that goes into the firewall, if so seal that area with a good sylicone.
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