The wet floor on the front passenger side is due to a leaking Heater Core. Besides getting your floor carpet all wet your vents, specially the window defrost vent will start to produce fog on the front windsheild. The Heater Core is a small radiator which lies on the inside of the vehicle somewhere behind the glove compartment. I had mine changed about a month ago for about $150.00 (parts and labor). The mechanic did not adust the fan vent well so now I get less air flowing out of my vents. Make sure to ask your mechanic to double check the airflow.
Condensate drain plugged or disconnected
HEATER CORE.
Are you sure it's water? Sounds like your heater coil may be leaking...
A leak (window / ac / floorboard etc.) may be allowing water in. Check the carpet's under the floor mat's for dampness. Finding the leak is another problem!
It is quite possible that a wet floor on a 1996 Oldsmobile Silhouette is caused by a leak in the body that allowed rain water to get into the passenger area. Window seals and the seals around the front firewall could have been damaged enough for this to happen.
Leak on drain line above floor level
It depends on where the leak is and what is causing the leak.
If bad plugs is causing the misfire. It could also be bad plug wires, a vacuum leak, burnt valve, blown head gasket, etc.
rain water leak is caused by a bad windscreen seal
they leak plasma
The 1999 Oldsmobile Alero does not have Freon in the A/C system. It contains R134 and not Freon which is R12. As I am sure you do not have the proper equipment to recharge the system plus the fact it is illegal to add refrigerant to a system with a leak, until the leak is repaired, take it to a professional and have the leak repaired. You have a leak or you would not need to add refrigerant.
No.