What Causes Radiator Coolant Bubbling? If you see bubbling in the radiator or coolant reservoir, it usually means there’s air or gases in the cooling system. Here are the main causes:1. Air in the Cooling System • If the system wasn’t properly bled after a coolant change, trapped air can cause bubbling.2. Blown Head Gasket (Most Serious Cause) • A damaged head gasket can let combustion gases enter the coolant, causing continuous bubbling and overheating. • Look for white smoke from the exhaust,
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