2018–2021 Chevrolet Equinox: Coolant loss with no visible leak (1.5T)

Symptom: The coolant reservoir keeps dropping and a low-coolant message appears, but there's no puddle. Sometimes there's sweet-smelling white smoke at startup, or a misfire.

Likely causes

1. Internal leak. Coolant that disappears with no outside leak, plus white smoke, usually means coolant is getting into the cylinders. A head gasket is the common culprit.
2. Reservoir or cap. Both are cheap to check for cracks.
3. Small outside seeps at the water pump, thermostat, or hoses that evaporate before they drip.

We found fewer owner reports for this exact pattern than for other pages. NHTSA shows only a few keyword matches, so treat this page as an early version.

DIY or shop?

• DIY: check the cap and reservoir for cracks, and keep a log of the coolant level.
• Shop: a cooling-system pressure test and a block test for combustion gases in the coolant.

Useful steps

1. Ask for a pressure test and a block test.
2. Check the oil for a milky look.
3. Don't keep topping it off and driving if the temperature gauge climbs.

Vehicle focus: 2018–2021 Chevrolet Equinox.

Safety / mechanic note

Overheating can quickly crack or warp the engine. Stop and verify with a mechanic if the temperature rises or the white smoke doesn't go away.