Hi you all. Just discovered a stain underneath my car after it had been parked for a couple of days, and the coolant level was really low, almost at the bottom of the expansion tank. It seems to be leaking from the bottom of the engine block, on the right hand side. I have topped it up, and I'm going to check out how long it takes to leak out, but I definitely have to fix it soon. You have any ideas what it is, and does it sound VERY expensive...??

Is that right hand side from front to back or the other way around?

...on the right hand side while facing forward driving the car

If your car ain't over heating and the water is coming from the bottom of the block it could be that the water pump is on the way out. Take of the drivers side wheel and see if you can remove the timming belt covers and have a look for water aound the inside of the covers and around the pump. It's the bottom sprocket. I've been told that the water pumps have a vent hole in then that allows the coolant to run out if the seals or bearings are on their way out. If it is the water pump sort it out quick beofre it lets go and the timming belt lashes up. May as well have the belt done at the same time if it is the pump.