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Unless the engine is overheating, you have air trapped in the system. Park the car on an incline or jack up the front as far as possible. When engine is cold, remove the radiator cap, set heater controls to hot, and start the engine. Make sure the radiator is full and watch for air escaping. Keep the coolant level full and when you see not more air bubbles escaping, you are done. Replace the radiator cap, and see if the sound goes away. If not, take it to a professional.

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16y ago
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Q: How do you fix the gurgling sound coming from the heater core in your 2000 Chevy silverado?
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