Coolant does two jobs beyond carrying heat: it stops corrosion inside the engine and radiator, and it keeps the water from freezing or boiling. The corrosion inhibitors wear out over time, and once they do, the cooling system starts eating itself from the inside.
Flush vs. Drain-and-Fill
A drain-and-fill swaps the coolant that sits in the radiator. A flush circulates fresh fluid through the whole system — engine block, heater core, and radiator — to clear out old coolant and sediment. Which one you need depends on how the coolant looks and how overdue it is.
When It's Due
Typical intervals run from about 30,000 miles on older vehicles to 100,000 to 150,000 miles on long-life coolant. Do it sooner if the coolant looks rusty or brown, has debris floating in it, or you've been topping it off with plain water.
Signs the Cooling System Needs Attention
Temperature creeping up in traffic, the heater not getting hot, a sweet smell, or discolored coolant in the reservoir. A pressure test at the same time catches small leaks before they strand you.
Cooling System Service for Albuquerque's North Valley
We're at 4201 4th St NW in the North Valley, where summer traffic keeps cooling systems working hard. See cooling system repair, or read why cars overheat.