I have a XC Holden Combo 2006, which is the same I think. I have the same problem as described. This car had a recall a few years back from a faulty AirCon drain tube which could cause the Airbag to disperse without warning. I had my car checked and it was fine. It is draining fine still.

The car is leaking into the drivers side from the firewall somewhere. The carpets are ruined and the passenger side is starting to flood now. I have to take the carpet out and don't know what tools i need. The bolts look like a star socket.

I cannot find where the leak is coming from cause its going under the carpet. I'm loosing PowerSteer too!

Should I take the carpet out and then run water to see where it is coming from? The dealer wants to charge $195 to diagnose and a further $595 to take the carpet out. This is all before fixing the leak!

Help I don't know anything about cars