Leaking Interior

[perke]

Guy's I'm a newby to this site but I'm so glad that I found you all. And here is my problem:
I have a 88 Gm that has a leak inside when I run the AC. I thought that it was the heater core
so I bypassed it. Still leaks. I've ran both air and flexibe hose into the drain but the darn thing
still leaks when iI run the AC. Help

[johnunit]

Is the water leaking down the firewall or out the vents? Does it do it on A/C only, or in other positions? Is this an automatic climate control (temperature in F on the slider) or a manual A/C car with just "hot" and "cold"?


Welcome to the site.

[Lincolnmania]

probably a buildup of leaves or pine needles in the evaporator housing, could also be a critters nest

[sly]

find the drip hole below the evaporator (the AC side) of the plenum under the hood. clean it out. that should solve your problem.

[perke]

Guys thanx for the awsome replies. It only happens when the ac is being used. I have the temp control unit. I've cleand out the drip hole.
Guess I need to do the cleaning out of the evaporator. I lifted the passenger side carpet and the water seems to run down under the black insulation.

[sly]

if you've cleaned out the drip hole, then you've probably got a bad seal on the firewall (or the lower nut is loose - accessible under the hood IIRC) You'll know it's right when you can pour a cup of water down the vent hole slowly and none gets inside the car.