When it rain we get a pool of water in the front passenger foot well. I suspect there is a drain pipe blocked but don't know where to begin looking. Can anyone help solve this water leak problem please. Steve

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.

Check for leafs that are blocking drain holes on both ends . Air inlet cowl in front of wind shield. This blockage would cause water to back up and enter the Hvac air inlet.

Drill a 3/8 th hole through the floor at the lowest point then look for the water leak ,is the AC drain pipe clear as this is the most obvious point of entry and the AC condensate will run into car if this pipe is blocked

Unsure about later models however on the early ones, look under the car where the sill is welded to the floor there is a lip hanging down ( where you put the jack ) . If you look along the join you will see slight rearward facing bumps in the panel pressings. These are the drains. Using a nail or piece of wire you can clear these ( make sure your sleves are rolled up to keep them from getting wet)
These are rear only , I suspect the water is coming from the back and running forward.
Good luck Marshall

drill a hole through the floor as a quick fix ,if it gets in let it out ,then check for the leak ,try under the firewall where the AC drain pipe is ,it could be the same pipe for drain water coming in from air intake vents

I suspect that water is pooling in the cowl area (in front of the windshield). Since it's at an angle, the water can't drain out the usual drain. This is also where the air is drawn in for the heat/a/c. I think that the water that collects is flowing in through the climate control system and coming out the floor vent. If you want to test it, jam some paper towels up in the floor vents and recirculating air intake and see if they get wet. If you just want to solve the problem, try backing into the space.

The AC evaporator units have a drain hose that runs through the floor because condensed moisture is a fact of life with AC units. Yours is plugged. You will have to get under the vehicle and look for the hose where it comes out, then take like coat hanger wire and clean it out, It is somewhere in the vicinity of where the passenger foot well meets the fire wall. If you have to raise the vehicle to get under it, make certain you have it safely supported. If you don't have the stuff, drive the passenger side wheels up on a good curb and use some cardboard to slide under.

Sounds like the air conditioner condensation drain line has popped off the air box under the dashboard. Good luck, Techjoel

A/C drain pipe blocked with old leaves and dead flies the outlet is on the passenger side of vehicle lift bonnet and look a lower of firewall for a rubber pipe with a **** in the end and squeeze it and shake it