Water sloshing in dash

Any suggestions on what this might be or how to fix it would be greatly appreciated,

I had the same problem with my 1989 Century after I changed the radiator hoses. I think that you have an air pocket in the heater core. The best way to fix it is to have the system flushed/exchanged.

I agree thats probably all it is... I tried to make it tougher than it was and found my fluid level was low causing the same noise. I think these newer cars have a moulded heater core, not like you would think. The plastic makes a sloching sound

I agree thats probably all it is... I tried to make it tougher than it was and found my fluid level was low causing the same noise. I think these newer cars have a moulded heater core, not like you would think. The plastic makes a sloching sound

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