My peugeot 806 1.9 tdi footwell is taking in water carpet is soked it is clean water where is it coming from no sun roof fitted

Once you have checked it isn't a car window that is slightly open there is three main reason for water in the foot wells. Sun roof, door seals and heater matrix.
If you have a sun roof fitted, check it is closed correctly. Open it all the way and check the running grooves it sits in for dirt and blockages. There are drain holes in the runners so try cleaning the runner grooves with an old toothbrush.
Open the front door on that side of the vehicle. Take a good look at the rubber seal the door presses against when it is closed. Any damage or splits can create leaks into the vehicle. Check the rear door seal for the same thing. If you can, check all the other door seals and the trunk/boot seal as well. These seals are usually a tight fitting 'push on' type which you can replace yourself.
This will sound silly but does the 'water' smell of anything? The heater matrix is under dashboard and is what supplies the heat to the heater blower controls on the dashboard. If this is leaking the leak will have a sweet smell as this is coolant from the engine. This is a big repair as you often have to remove the whole dash to repair it.

How wet is the foot well? This is likely to be one of two things. Door seal rubber or the Heater matrix.
Try this bit of detective work. Does it only get wet when it rains heavily? Is it just the front that is wet? Feel the carpet in the foot well. How high up the foot well carpet does the wetness go? Does the wetness smell of anything? Do you have a sun roof fitted? Sun roofs have drain holes that can clog up so the rain pools up in the grooves and runners then over spills inside the vehicle.
If it only gets wet after rain it could be a worn out door seal rubber or the sun roof letting water in. Door seals usually cause shallow pools of water so the wetness won't rise very high up the carpet. The sun roof sometimes causes the seats to get wet as well.
If it is wet all the time, the wetness rises high up into the foot well and it has a 'sweet' smell, it could be the small radiator unit,(the Heater Matrix), behind the dashboard that supplies heat to the heater blowers leaking. Depending on where exactly it is fitted you'll sometimes get wetness in both front foot wells. The smell is the coolant from the engine.
Hope this helps.

A simple test is to feel around the carpet in that footwell. See how far up under the dash the carpet is wet. Does it only happen after rain? Do you have a sun roof fitted?
If the carpet is only wet low down on the floor the most likely reason is either a perished or damaged door seal rubber, a faulty sun roof seal or the drain channels for the sun roof are clogged up. Check the footwell in the back as water always flows and settles at the lowest point in the vehicle.
If it is high up and nearest the middle of the dash you issue could be the heater matrix under the dash but as it seems to be only on one side this might not be the issue.
Door seals are a simple case of pull the old one off and push the new one on and they don't cost silly money to buy. Heater matrix issues, unfortunately, usually involve taking the whole dashboard out to get to it.
Hope this helps.

And where exactly is this rain coming from? The sun roof? The door seals? Seeping in down in the footwells (soggy carpet)?

Sometimes "rain" can be mistaken for A/C condensate that is not draining due to a plugged condensate drain. If your A/C is running and it's hot and humid out then you should see some water drips on the ground underneath the front area of the vehicle. Let it sit in one location for a few minutes after you come in from driving it. Let it sit for a few minutes with the engine and A/C running. Move the vehicle and look for the telltale wet spots from the condensate drain. If you don't see a wet spot then chances are the drain is plugged. The condensate will back up and drain inside the car ...typically in the passenger footwell and making the carpet wet.

check door/ boot seal on side that the carpet is wet .also if your car has a sun roof check the drain chanels.

relay is bad, or the motor and or cable is stuck and needs oiling or grease ! how long have u owned car?????not to long ,Iam sure!!!

the water can travel along surfaces or beams in the car so you cannot tell where it is actually leaking. in my ford windstar water leaked in right over the fuse box. it ran along a cross beam from the passenger side. if it has those plastic strips they use to go in between small gaps in the metal... like along the roof where the roof is and the metal of the sides joins it is likely they are leaking. best to take a garden hose and have someone inside the car with a flashlight on the floor looking for leaks

have the rubber seal around your windshield check by a wind shild installer base on what you explain the sel at that corner is leaking and the water is leaking back into the vehicle

Hi, we also have a 2002 Toyota Rav4 and developed a leak in the front driver's side of the car. After much research, we discovered that the drain wells from our sun/moon roof were clogged. If you have one of these, I suggest that you open the sun roof and look carefully. You will notice some tiny little holes in front and in the rear of the sun/moon roof tracks. Over time, these become clogged with dust and debris. You need to find a long, sturdy piece of thin wire and run it down the holes. To test if you have properly unclogged these, take a small amount of water and pour it down the holes. You should see water coming out of the drain wells under the car around the rear of the front tires. Hope this helps.

if its got a sun roof check the drain pipe from that it may have come off