Water dripping from the tailpipe

Symptoms

• Drops or a trickle of clear water from the tailpipe after starting
• Usually stops within a few minutes of driving
• No smell or oily sheen to the water
• No overheating or other symptoms

Likely causes

• CommonNormal combustion condensationBurning gasoline produces water vapor, which condenses in a cool exhaust system and drips out until things warm up.
• CommonShort-trip driving patternFrequent short trips don't let the exhaust fully heat up and dry out, so more condensation collects.
• Less commonCoolant leaking into the exhaust (if water is excessive or colored)A head gasket or crack issue can add real coolant to the mix, usually with a sweet smell and continuous white smoke.
• CommonColder outside temperaturesCondensation is more noticeable in cold weather when the temperature difference is greater.

What to do

1. Watch whether the dripping stops within a few minutes of driving; if so, it's almost certainly normal condensation.
2. Check that the water is clear and odorless, not oily, colored, or sweet-smelling.
3. Check the coolant level periodically to make sure it isn't dropping unexpectedly.
4. If you also see continuous white smoke or notice a sweet smell, treat it as a possible coolant leak instead.
5. No action is needed for normal condensation dripping.
6. See a shop only if the water is excessive, doesn't stop, or comes with other symptoms like overheating or smoke.

When to call a pro

Only see a mechanic if the water is excessive, colored, sweet-smelling, or paired with white exhaust smoke or overheating, since those point to a coolant leak rather than normal condensation.

Safety