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The cooling system keeps your engine from overheating in summer and, with antifreeze, from freezing in winter. When it fails, damage can happen quickly. The good news is that cooling problems usually give warning signs, and regular coolant service is one of the cheapest ways to protect an engine.
Last updated: October 2026
Replacing old coolant keeps the corrosion inhibitors working and protects the system from freezing and boiling.
Radiators can leak or clog, and rubber hoses weaken with age. A swollen or cracked hose is easy to spot.
The pump circulates coolant. A stuck thermostat can cause overheating or a heater that never warms up.
Pressurizing the system helps find slow leaks that do not leave obvious puddles.
Typical ranges only. On some engines the water pump is driven by the timing belt, so it is often replaced together.
Pull over safely and shut the engine off before it overheats.
Do not open the radiator cap while hot. It can spray scalding coolant.
Coolant is often green, orange or pink and has a sweet smell.
It does not disappear without a reason. Find the leak.
Can point to low coolant, air in the system or a thermostat problem.
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It depends on the type. Many modern coolants last 5 years or about 100,000 km or more, while older types need changing sooner. Check your owner's manual.
Turn off the A/C, turn on the heater to pull heat away, and pull over safely. Let the engine cool before checking anything and call for help if needed.
Use the type specified for your vehicle. Mixing incompatible types can reduce protection and cause deposits in the system.
They can be a short-term emergency measure but they can also clog small passages. A proper repair is the safer fix.