[richtazz]

I've never heard of what he's saying. TEh heater core is a series of tubes fed by water under pressure. It is virtually impossible for water to get trapped in a heater core surrounded by air to create a sloshing sound. Teh water and air would be forced out under pressure, so I doubt that's your problem. The only suggestion I have is to find out what exact drains they checked, be sure they checked your cowl drain, and not just the one for the heater box and A/C evap core. The only other place water could be is in the floorboard under the carpet, have you noticed a musty smell in your car? Take the bottom door sill plate off and look under the carpet, there are places water can set that won't necessarily get the carpet wet, but I don't think they could create the sloshing sound you described in your earlier post.