Originally Posted by rarebear
in some cases the aircon leaks condensate into the footwell (bleeding hose lose or knackered), if this is not noticed it will rust the bottom away from the inside ! no use waxing a car that produces water/rust from the inside . Check under the carpet .......!
According to my Garage, that is not a big problem as far as corrosion goes. It is correct that the A/C condensation can spill over into the foot weels, but in this case, the foot wells are very well protected on the inside. On top of the chassis in the foot wells, a 2mm layer of heavy duty tar like substance, is sprayed or glued direcly to the inside floor pan. In my own car, i found evidence of the A/C having spilled over in one side of the footwells,(sound dampening was semi rotten) but the floor pan had not taken any damage at all, since the tar kept the water out. I scraped through the tar a couple of places, and there was no sign of rust underneath it. (resprayed it afterwards of course)
In order for condesation to spill over into an area not protected, would mean it would need several liters of water(in my estimation) since the tar covers the whole area and up he sides a bit too. But i suppose if you get enough water down there, evetually the water will reach the sills in the side, and that is not protected at all, not even painted in some places.
The garage told me that the only damage they have seen with this condensation problem, is to the carpet and sound dampening material, which rots if the water is allowed to stay for longer perionds of time. They had not seen corrosion as a result of this (yet)