Left front inside car is full of water under the floor mats,can it be from the air con and how to resolve the problem

the drain plugs are located under the floor mats in the floor pan . If you look from underneath you will see the round plugs .If the carpets have been wet that bad then you will never get rid of the musty ( fungus) smell . consider new floor mats

air con drain plugs blocked with dirt or muck, they are located under the car (2) on top of gear box.get under the landy and clean with a piece of wire.( hard to find).

You probably have two different issues here.
The water on the floor is usually caused by a drain tube being stopped up. The tube is supposed to let the water drain out of the car and onto the ground. It should be on the bottom of the firewall or below the floor.
You would need to have the computer scanned for trouble codes to find out why the check engine light is coming on.

You could have a windshield that is leaking water. Often this water will trickle down from the bottom/inside of the glass and then down the firewall, under the carpet or floor mat, and to the floor. The way I usually hunt for these is to remove the floor mat or carpet then get a flashlight and lay down in the cab so you can see under the dash area while someone sprays water on the vehicle with a garden hose. Often the leak will show up as a trickle that you can then backtrack to it's source. Another spot to look for is at the cowl in front of the windshield where air for the heater and a/c is pulled into the passenger compartment. The water drain holes in this area can plug up and allow water to overflow into the passenger compartment. Good luck, hope this helps!

Also check the fender drains. If they get clogged up the water will spill over into the air intake for the cabin. May have to remove to hood cowling the plastic under the wipers. The inspect from debris and if you have air hose blow the drain and vent out.

I don't think it's your air conditioning, most often times when you get water in the cabin on the floor boards it's a bad heater core. Do you smell like a sweet odor? If you do check your coolant level in the radiator and/or resivior, if it's below your minimum fill line that's gonna be your problem. Hopes it's helpful.

its caused by your aircon the hose may leaking under your dash board

i would check water in radiator as sounds like the heater box under the dash is leaking and will certainly end up on floor

There are drain holes, maybe tubes that you can check. Some are in the doors too. Check under the hood and where the wipers are for leaves, etc.

It may be due to the air conditioning hose being blocked. Therefore the water must be backing up into the vehicle, under the carpets and into the back seats instead of flowing out