2005 v50 When it rains my car fills with water. It has happened on the driver and passenger side and under the seats. I saw water dripping from the glove box area.

Most likely it's the sunroof...youtube how to fix a leaking sunroof

Drip from where? If water is getting to your floorboard, and if you've ruled out a stopped up air conditioner drain, then it has to be coming in from either the firewall or the underside of the vehicle - especially if you're sure it only happens when it rains.

Get your heater core checked. May be leaking.

Possible that your drain hose is plugged up and backing up and not draining properly. Happened to me . Fire ants got in hose to get water and plugged it up water dripped in floor board. Just a suggestion

Check the door rubber seal for flat spots or maybe something stuck to it causing water to get past it.

You most likely have a plugged a/c evaporator drain tube. This tube drains away the water that condenses on the evaporator core [the one under the dash next to the heater core] whenever the a/c is running. If the tube is plugged then the water will fill up the bottom of the plastic heater/air conditioner housing until it overflows and leaks onto the floor. This drain is located on the engine side of the firewall, passenger side, down very low at the bottom curve of the firewall and is usually a very short rubber hose about 2" long. It can be hard to spot as there is often a lot of stuff in the way that makes it hard to see. A quick check is to park the car on a level spot and operate the a/c for sevreral minutes. You should soon see water dripping onto the ground from under the car on the passenger side of the vehicle. If you see it dripping then the hose is ok and you have a different issue, if not then you can pretty much bet that the hose is plugged. I usually use a puff of air to blow out whatever has plugged the hose [bugs, debris, etc] which fixes it until the next time it plugs.

This problem is rare. Try to check if the water really is coming from the outside because its possible that the water is coming from the air conditioning unit's condenser.

To isolate the problem, have someone seat in the passenger seat. Wash your car. Ask the person inside the car if he/she sees or feels any water droplets. If the passenger doesn't see or feel any drops. Its possible that water is coming from the condenser unit of your A/C. You need to have your condenser cleaned if this happens.

This happened to me as well, i thought that my car had some sort of leak from the outside. Turns out that it was only the condenser. I had it cleaned and viola. No more water drops

Maybe. If you have a fixed antenna on that side of the vehicle, the large rubber gromet on the wire leading into the passenger compartment may have come out, allowing lots of rain water to enter the vehicle. Happened on my 94 and flooded the passenger side.

I have a similar problem with a 2003 cadillac cts. The water drips from the bottom area of the glove compartment. If you would stick your hand under and feel around, there is a removable panel ( two small bolts and one star screw) there , you will fell the sponge on the other side of the panel is wet. I removed this panel and ran the air conditioner and place a large mirror on the floor and shine a flash light up but did not see any water dripping.
The Driver side has a similar panel, I removed that also but saw nothing, not even the canister. But the out side pipes from the AC show the canister leads in the hood under ther driver side.
Any way I looked under the car and found the drain hose. It is located under the driver seat area. I tried fishing a coat hanger through it and it went a long way up. If you look on the side panel where the parking brake is located you will see this hose going to the top of the hood. You will need to depress the parking brake for a better view. I tried the Ac bot no condensation water came throug.
I late found a similiar hose on the passenger side. I tried to push the wire in but did not get too far.
One of these hoses drain the Sun ( moon) roof.
I then took a cap from a silicone tune ( u know the screw on tip that you cut at 45 degrees) That I inserted into the tube under car, then I insert a small funnel into the silicone cap , next with my garden ready and flowing , I force water up through the AC drain hose. Dont do too long, 5 to 7 secs is good. You will see the water come through the other drain hose. It is best to have some onlookers. Note some water might flow up to the moon roof drain and into the car so place some towel on the seat.
That works for me.
Thanks all
and good luck