Noises are probably the hardest thing to help diagnose without actually hearing them and being with the car. It could be a vacuum leak, a leaking mode switch (again vacuum leak) or maybe you have air in the cooling system and what you hear is the air going through the heater core. Make sure that you have all the air bled out of the cooling system and check all the vacuum hoses to see if any have been knocked loose. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, Mike Substelny <msubstel@xxxx> wrote: > This sounds like a vacuum leak from the AC selector switch. Remember, that switch