AC, Heat & Cooling

Coolant Leak: Causes, Signs, and How Serious It Is

Written by the certified mechanics at Elite Auto Repair Texas · 15+ years repairing cars across Texas

The short answer

A coolant leak usually comes from a hose, radiator, water pump, or thermostat housing. Look for green, orange, or pink fluid under the front of the car and a sweet smell. It's serious because low coolant leads to overheating and engine damage.

Signs of a coolant leak External vs. internal leaks Is it safe to drive?FAQs

Mobile mechanic working on a car in a driveway — On-site vehicle service illustration.

Signs of a coolant leak

Watch for:

Colored puddle under the engine
Sweet smell after driving
Low reservoir level
Temperature gauge rising

External vs. internal leaks

External leaks are visible. Internal leaks — like a head gasket — may show as white exhaust smoke or milky oil.

Need this checked today?

Our mobile mechanics provide radiator & cooling system repair at your location — call 469-421-7910.

Is it safe to drive?

Only short distances while monitoring the temperature gauge. Never let the engine overheat.

Frequently asked questions

Can stop-leak products fix it?

They can temporarily slow tiny leaks but may clog the system. Fix the source.

Is coolant dangerous to pets?

Yes — it's toxic and tastes sweet. Clean up spills immediately.

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Why Does My Car AC Smell Like Mildew, Vinegar, or Sweet Syrup?

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