I have a cabin flood situation for a long time maybe the past 4 years and couldn't figure it out why? I taped the sun roof and used those Flex Seal Liquid to seal the trims on the roof thinking that it should prevent it from leaking when it rains. And yes it usually flooded when it rains. However, this year something different happened. There was no rain but still flooded last night. 3 days ago, my T- bleeder valve broke off completely. I have heard hissing sound somewhere under the hood for a while now but just didn't know where it came from. I guess now I now it was the T-bleeder valve cracked and then completely broke off 3 days ago. Car was not even able to drive. Luck that i got some tools in my car, I took the left over plastic from the other tube and connected the black plastic tube to the remaining t-bleeder valve and the car was able to start and drove home for 3.9 miles. Pix below. Some of the valve must have been melt and probably still in the cooling system. I bought a brass union to connect those tubes together. Car drives fine now. However, it over heated after about 25 min last night. Temp gauge going up so I just immediately pulled over and turned off the car. The water was boiling, I slowly loosened the cap to release the heat and some of the steam water. (its mainly just filtered water now, because I tried to change coolant so I drained all the coolant and poured filtered water in nowadays) I Tried pouring water in the expansion tank. it just doesn't fill up. Water always goes down quick and nothing left in the expansion tank. This has been happening for the past 6 months actually. It just doesn't hold the water. When I opened the passenger side door, whole bunch water splashed out. I wondered wth and where the water came out it wasn't raining. This morning, I opened the passenger side door, more water came out too. I immediately thought it must be the water from coolant expansion tank. It just leaked into the cabin. I took some pix below. I found that silver tube and the black tube was dripping but not squirting yet. If its not those 2 tubes, it must be a major leak under the passenger side floor. I don't know how to open it. There is no way I could find where the leak is without any professional equipment. I guess that 4 years of roof leak into cabin was a mistaken thoughts, its just a leak somewhere along the cooling system, it just leaked into the cabin mainly the passenger side.

So where should I take the car to for inspection? Rover dealership? They may charge a lot just to inspect it and sometime, they may not even be right. I'm pretty sure I have to replace some tubing. How much ? I guess no way to know until I find where the leak is ? Any suggestions ????

1 more thing, I left the coolant expansion cap open and the smaller screw looking cap open as well, the temp gauge stays in the middle the whole time for 2 hours of driving no problem. But yes I see water steam keep coming out. I just kept adding a lil bit filtered water in. The car drives fine, no lights came on.

2006 LR3 with 64500 miles only. Ya I don't drive a lot.

 

That is your AC drain. The tube empties straight out to under the car.

They can clog up over time and will give you water in the footwells.

Best bet is to get trimmer line and push it through the tubes (there's 1 on each side of the console). Then pour a little water in the tube and look underneath, should see wet spots on the ground.

 

Sounds like your heater core may be leaking.