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Heater core its air bubbles in the lines when the motor starts the water pump starts circulating Check your radiator coolant level
NEW ANSWER: Yes he is right. But you need to check the heater hose quick disconnect that is screwed into either the front left side of the intake or rear left side of the intake. This will be you standing in the front of the engine.
The disconnect has a small plastic piece down towards the bottom inside of it that SLOWS the water down before it inters the heater core and that stops the sloshing sound that you hear. Replace the quick disconnect fitting in the intake / The one that the heater hose hooks to. If it was low on coolant and you filled it and the noise is gone then don't worry about what I said.
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