Water dripping under dash while running a/c.

I have an '88 Isuzu Trooper and when I make a left hand turn while running the air conditioning, the water under the dash on the passenger side tends to drip onto the floor.

Is there something that's stopped up that needs to be cleaned out? Thanks for any help.

I had the same problem, the drain hose from the heater/AC housing is either kinked ,clogged or missing. In my case someone had replaced the heater core and not replaced it properly. If you check under your passenger side carpet, you will probably find that you only NOTICE it when you turn left but that its leaking all the time. The proper proceedure to mount dismount the housing is in the Haynes Manual or any good radiator shop can fix it in a couple of hours.

Thanks Hollowcreek for replying, but I had found out that there was a short rubber hose not far from the heater core connections that has soft rubber that closes when there's no water coming out from the condensation of the a/c and opens as water is coming out. That hose appeared to be sticking apparantly over time, but I was able to open it back up so the water could drain freely again.

Thanks again for replying.

Thats the one that I was missing. Mine was just gone.