Bubbles in the Radiatorīesides allowing coolant into the combustion chamber, an internal head gasket leak allows exhaust gases into the coolant. If the leak in the head gasket is large this white smoke can often be excessive and billow from the tailpipe. ![]() This smoke can be differentiated from moisture during a cold start by a sweet smell and will continue even when the engine is warm. When this happens to coolant burns/evaporates with the combustion process and appears as white smoke coming from the tailpipe. Most head gasket leaks are internal to the engine allowing coolant to flow into the combustion chamber on every intake stroke. If there are no other cooling passages or hoses near the head gasket you may be able to positively identify the leak as a head gasket leak, but if there are other cooling passages nearby, you may need to add a UV dye to the coolant then watch the head gaskets with a UV light to positively identify the leak.
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