coffee perkulator noise

[allsound]

So I was in my friends 95 Saab at which point his heater was making a very distinct sound similar to that of a coffee pirculating. I came back to my parents and now that I'm listening for it their car is doing the same thing only a much quieter scale (wouldn't of been noticed if I wasn't looking for it).

Does anyone have any suggestions as to what it could be that'd be making that noise?

Thanks for entertaining my curiosity

[figo]

Check the coffee maker in the glovebox, SAAB's coffee makers are known to break.

Also check the overflow, thermostat ?!?

[figo]

**

For your friends car: if it was loud enough to notice, it could be a problem. Check the coolant level. If it is low, you may be hearing air bubble passing through the heater core. Also, this means there is a leak somewhere. Was the car running hot?

A lesser possibility is that a blown head gasket may be draining the car of coolant, while simultaneously pressurizing the cooling system with cumbustion chamber gases. Check for white smoke, a loss of coolant with no apparent leak, and if need be a compression test across all cylinders.

Jim