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You probably didn't bleed the system properly. First of all, let the engine cool down completely. Then, open all bleeding screws and add coolant to the system until clear coolant without bubble comes out of all bleeding holes. Tighten all the screws in the order of lowest to the highest because air exits through the highest point in the cooling system. After ...


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Generally bubbling coolant where the temperature is not high enough for boiling indicates a leaking head gasket, a cracked block, a warped cylinder head, or something similar that allows exhaust gas to enter the cooling system. After opening the system to change the thermostat, you should have purged air from the system using the procedure described in the ...


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