Your air conditioner is working properly but, there is probably an easily cleared clog in the rubber release tube ...an inexpensive repair.
If there is no heat coming out of the vents, but there is air coming out on a 2003 Mercedes Benz E-320, check the thermostat to make sure it is not sticking. If this is okay, check the heater core. If the heater core is bad, there will be water on the passenger side floorboard.
I had the same thing happen on my '87. It started after the windshield was replaced & something wasn't done right there that let water in at the bottom of it.
94 E 250 with 5.8 V8 sensor is on the exhaust pipe coming out of the engine on the passenger side. Access is from underneath just behind the front passenger side tire.
it could be a hole in the floorboard. or it could br coming through the seals around the dome light and coming down the paneling The problem is the AC vent opening has weather stripping that rots and crumbles when it gets old. Lift the hood, look on the passenger side near the windshield and you will see a plastic pan with drainage holes. Check here at this link for photos and details about the simple repair. Its fairly easy and can be done with household type stripping and silicone caulk. http://www.lincolnsonline.com/tech/00117.html
It could possibly be the heater core Check your heatting and a/c
I BELIEVE THE WATER COULD BE COMING FROM YOUR AIR CONDITIONING .
The fuel filter on a 1993 Cavalier is located and the rear of the vehicle on the passenger side. If you slide up underneath the car, you will see it coming off of the fuel tank. Hope that helps! It is located right behind the gas tank on the passenger side. That is if it is a z24
Passenger side near the water inlet (has three wires coming out). It's attached by one phillips head screw located underneath the sensor. Use a stubby screwdriver if you have one.
First you have to find where the water is coming in. Have a friend use a water hose around the windshield, cowling, etc. while you check inside for leaks. Water could be coming through the firewall around gaskets as well. Be careful to not soak any electrical components if squirting water under the hood. After finding the leak then you can decide the best course of action to stop it.
common fault on corsa combo, it the passenger door seal fella.
The problem is most likely right underneath the condenser in the engine compartment. Sometimes the AC drain cock gets plugged with dirt, mud or gease and then it backs up or leaks so slowly it leaks back behind the fire wall. If you trace from the drain spout to the inside, you can only see where the water is coming from. I cleaned mine out and put some good silicone around the fitting and have had no water since.
there is an air inlet under the hood up next to the fire wall on the passenger side for the heater / air cond. Down inside the cowl is a gasket for the inlet to keep water from running down into the blower housing this gasket is very thin foam rubber probably wasnt much when it was new but when it and the caulking break down it leaks into the cabin area it could be something else but ive seen this in a couiple town cars