Heres the deal, I am 99% sure this time that the leak is comming from the heater control box (I'm not sure on the exact name of the unit). This unit is located on the fire wall of the car on the passanger side, it is where the a/c dryer/accumulator is located. Now on with the problem, I think that the gasket that goes around this box is the cause of water leaking inside the car. Today I tightened up 4, 10mm bolts along the bottom of this box (hood side of the car), and dried/cleaned up my carpet.

If any one could please help I'd appreciate it, let me know what I have to do next, and if this job is a DIY or dealer. Also is there anywhere else I could look for a water leak. Thanks

P.S. the windshield was leaking but that was taken care of.

What kind of condition is the car in? Is the heatercore on the engine side of the firewall or the passenger side of the firewall? Sometimes heatercores can leak. Does the "water" have an odor to it? To be safe, maybe pull your carpet back. It will start to stink if you leave it, before you can get to drying it.

One other thought is the heater box has a drain for the condensate produced by drying the air entering the cabin. Locate the a/c drain under the heater box, verify its not plugged up. Water (condensate) will spill into the car if the a/c drain is restricted, plugged up.

What kind of condition is the car in? Is the heatercore on the engine side of the firewall or the passenger side of the firewall? Sometimes heatercores can leak. Does the "water" have an odor to it? To be safe, maybe pull your carpet back. It will start to stink if you leave it, before you can get to drying it.

After a lot of work the car is in excllent condition (check this link for some pics http://www.cadillacforums.com/forums/showthread.php?t=26485&highlight=shes+back). I am not sure where the heater core is located, but my guess is that it is going to be on the inside of the car. The water has no oder to, no antifreeze smell, etc, I had a cooling system pressure tester hooked up while I was looking under the dash (passenger side) with glove box and lower pannel out of the way, etc. and no leak. This is why I ruled out the heater core and am highly suspecious of the heater box seal is the cause of the water leak.

One other thought is the heater box has a drain for the condensate produced by drying the air entering the cabin. Locate the a/c drain under the heater box, verify its not plugged up. Water (condensate) will spill into the car if the a/c drain is restricted, plugged up.

I didn't know about that line, I'll check it out as soon as I get home. Thanks for the suggestion.

That's why after you have the a/c on or whatever, you park your car, and you'll notice a little pool of water on the ground sometimes.

68'Eldo, I knew that the pool of water is from the dryer on the a/c system, but I didn't know it was through a hose/tube.

Now, I could not find the tube/hose, so for now I sealed up the top of the heater box with blue rtv as a temporary fix until I can take the car into the dealer to get this problem solved once and for all.

If anyone has any other suggestions please feel free to drop a line, thanks all I appreciate the help you guys have given me so far.