Chances are the drain for the AC is plugged and not allowing the condensation to exit the vehicle properly. As a result, you get that smell.
As far as the noise you hear at start up, make sure the coolant is full. What you are hearing is coolant entering the heater core. It should remain full all of the time and not be heard unless it's low on coolant.
Monday, November 2nd, 2009 AT 10:28 AM