If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located. Replace Cap - Secure the coolant / antifreeze reservoir cap. Add Coolant - Determine coolant / antifreeze type and add fluid properly. Check Level - Determine the coolant / antifreeze level. Find Reservoir - Locate the coolant / antifreeze reservoir and clean it. Other than the check engine light turning on, here are other symptoms that can tell when. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. Open the Hood - How to pop the hood and prop it open. Thermostat stuck open If the engine coolant level is low. Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury always allow the car to cool down completely first. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. ![]() One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. ![]() Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. while other designs are less accessible and require professional know-how. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Low engine coolant level due to a leak Failing thermostat (stuck open or closed) Engine overheating due to a faulty water pump, failed cooling fan, etc. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. This is generally steam caused by condensation. The causes of white exhaust smoke can vary however, it is common to see white exhaust smoke when first starting a car, especially on cooler days.
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