Our 99 Buick Century leaks on the inside on the passenger side when the air conditioner is on. How do I fix it

When the heater is on, nothing leaks, only when the air conditioner is on. How do I go about fixing this problem before the floor of the car rusts out from the constant water laying in there from the leak?Our 99 Buick Century leaks on the inside on the passenger side when the air conditioner is on. How do I fix ityou may have to clean the drain out for the air conditioner,they have a drain the goes to the outside through a tube and it gets stopped up once in a while from debris,and stuff from the out side,you ran run a piece of a wire through it and open it up,just don't poke a hole in it or it will leak inside all the time,that's all that's wrong with it,it only takes few minutes to clean this out,and its located sort f at the bottom oaf the heat and air box,and it should stay cleared out for a while,i have had to remove the heater box on some of them because they had so much junk in them they would keep stopping up all the time,good luck on that one i hope its a simple cleaning job.Our 99 Buick Century leaks on the inside on the passenger side when the air conditioner is on. How do I fix itunder the hood on the firewall there is a small hose sticking out pointing towards the ground. it is clogged, just stick something in it like a coathanger and it will unclogOur 99 Buick Century leaks on the inside on the passenger side when the air conditioner is on. How do I fix itThe previous answers are all correct, just remember to watch your eyes when the water comes out there will be about a quart. Careful with the coat hanger as you can damage the evaporatorOur 99 Buick Century leaks on the inside on the passenger side when the air conditioner is on. How do I fix it
Clean out your clogged evaporator outlet. It should be located on the outside of your firewall. It looks like a little rubber elbow. What is happening is that when the tube becomes clogged, the water builds up in the evap case and has no where to go except escape through any mating surface or vent hole in the lower half of the case and thus leak out onto the passenger side.



If you open the hood, look at the firewall section near the passenger side. Look down about halfway and I am sure you will spot it.