What it usually is
- Cracked or swollen radiator hosemost common
Wet hose ends, spray on the underside of the hood.
Fix: Overheating & Cooling System Repair → - Radiator end tank or seamcommon
Crust on the plastic tank, drip at the front.
Fix: Radiator Replacement → - Water pump sealcommon
Drip from the weep hole, stain below the pump.
Fix: Water Pump Replacement → - Thermostat housing gasketcommon
Leak at the top of the engine where the upper hose connects.
Fix: Thermostat Replacement → - Heater coreless common
Wet passenger floor, fogged windshield, sweet smell inside.
Fix: Heater & Blend Door Repair →
What to do right now
- Note the color and where the puddle is under the car.
- Top off with the correct coolant, not just water, if you have to drive.
- Watch the temperature gauge.
- Schedule a pressure test.
How a mobile mechanic handles it
We come to where the car is — that's the whole point when it's a coolant leak situation. We diagnose with a professional scan tool and proper testing, tell you what's wrong and what it costs, and fix it on site when parts allow. Most of these are single-visit repairs in your driveway.
FAQ
Common questions
Is a small coolant leak a big deal?
Small leaks become big ones without warning, usually on a hot day on I-40. Find it while it's small.