My car has a lot of condensation on the front and rear windows ,dampness has formed in the passenger foot well,what could be the cause?

door rubbers need changing possibly

Are you certain it is rain water? It could be condensation from the A/C coil that fails to drain out of the drain pan, or possibly coolant from a leaking heater core. If you are certain it is rain water, depending upon the age of the vehicle, and possibly some other things, here are the possible options:

1. Leaking door gasket.
2. Leaking windshield seal due to rust
3. Leaking windshield seal due to improper installation
4. Leaking windshield seal due to acoustic (sound) over pressure (if you have extreme sound system with heavy bass)
5. If you have a sunroof, if the drain hose comes down the passenger side door column, it could be leaking into the passenger compartment rather than drain through the floor pan.

Leaky doors, windscreen, windows.

possible a/c condenser drain leaking in to cab

check that this is no a/c condensate from the ac unit inside the car. The condensate formed by the cooling action of the air inside the car drains out a hose on one side about the wheel area

Depends on where the water is coming from. The 2 most often causes of water buildup is either the heater core is leaking or the AC condensate drain tube is blocked. If the heater core was leaking, you'd smell antifreeze or see steam coming from the vents while driving. The AC condensate drain tube lets condensation water to drip overboard from the housing. This tube is on the bottom of the AC case on the firewall side under the hood. Sometimes you need only pinch it to open it to drain out the water buildup..

Check to see if the muffler is sitting below the floor pan? If so the condensation is forming from the heat caused by the muffler.

Sounds like either your heater core has a small leak (usually you will smell coolant when you first turn the heat on and will be slowly loosing engine coolant) or, if the condensation is on the inside of all the windows, check the rugs for signs of dampness If you have a body leak the additional humidity inside the car from the damp rugs will cause that. If you find neither, just leave the side windows open about 1/8" and the temp should balance inside and outside and you wont see any condensation.

sounds like the air conditioning drain for condensation is plugged

Hi, this sounds like a broken heater core ,check if the car is using more antefrezze than normal,