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When you say "sometimes", whad do you mean exactly? When cold? When warm? When accellerating?
White exhaust smoke (which has a sweet smell) is often an indication of a blown head gasket. You'll need a compression test or test the antifreeze against exhaust gas contamination. Although the compression test will tell you more about the contition of the head gasket.
Where exactly does the white smoke come from under the hood? Maybe there's a puncture somewhere on the radiator hose or heater hose and the antifreeze sprays on the exhaust? Please check. There still is a tiny bit of hope it's not the gasket...
LOOK UNDER HOOD AROUND RADIATOR AREA FOR LEAKS AND CHECK FOR LEAKING RADIATOR HOSES.CHECK TOP RADIATOR HOSE TO THERMOSTAT IF HOSE LEAKS THERE YOU WILL SEE A LOT OF SMOKE AND STEAM WHERE COOLANT SPRAYING ON HOT ENGINE.
this could just be oil leaking out off value cover and burning off exhaust can u smell the smoke? does it smell like antifreeze ?? if smells like antifreeze more than likely have a coolant leak if has little smell or burning oil smell probably an oil leak
More than likely the antifreeze was leaking onto the hot exhaust manifold and/or muffler pipe. Since the car isn't hot anymore, its not smoking. Driving is not a big hazzard unless the steam prevents you from seeing or if you run the antifreeze too low, which will overheat your engine. I would fix the leak ASAP...
You can tell by looking at dip stick if the oil has a creamy white substance there is antifreeze getting in oil (blown head gasket) or if ther is excessive white smoke coming from exhaust pipe upon acceleration. steam from under hood may be a coolant leak from a rubber hose or it may be leaking from the cylinder head onto the exhaust manifold also the car will be using up antifreeze.
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