What this repair actually is.
A technician inspects the radiator, hoses, water pump, reservoir, and heater core, and uses pressure and dye testing when needed to find the exact source of a coolant leak. Coolant can leak from a dozen different places, and some leaks burn off inside the engine without ever leaving a puddle, so pinpointing the source first avoids replacing the wrong part.
How you can tell.
- Green, orange, or pink puddles under the car
- Coolant level keeps dropping between top-offs
- Sweet smell outside or inside the car
- White smoke from the exhaust
- Oily film on the inside of the windshield
- Low coolant light comes on repeatedly
A small leak eventually empties the system and causes overheating, which can destroy the head gasket or the engine itself.