Flushing and replacing engine coolant is an important maintenance task that helps keep your engine running at the right temperature and prevents corrosion and اتوسرویس داوود overheating

As coolant ages, its protective properties diminish; most automakers suggest a full flush and refill every 2–5 years based on driving conditions and coolant type

Here’s how to do it safely and effectively

Never attempt this procedure while the engine is still warm or running

Never open the coolant system while the engine is hot or running

Hot coolant under pressure can erupt violently, leading to severe thermal injuries

Allow a minimum of 60 minutes for cooling, but performing this in the early morning ensures maximum safety

Park your vehicle on a level surface and engage the parking brake

Most vehicles feature a translucent plastic coolant reservoir near the radiator with labeled max and min lines

Look for a labeled container connected to the radiator by a hose, often marked with "MIN" and "MAX"

Always err on the side of caution—wait longer if you’re uncertain

When in doubt, give the engine more time to cool—patience prevents injury

Position a heavy-duty container beneath the radiator drain to collect all spent fluid

Antifreeze is deadly to pets and pollutes soil and water—clean up spills immediately

Look for the radiator drain valve, usually at the bottom corner of the radiator

Inspect carefully to identify the correct type before attempting to open

Turn the valve or bolt gently to avoid stripping or breaking

Let the fluid flow until it stops dripping—this may take several minutes

You may also need to open the engine block drain plug if your vehicle has one, as some coolant remains in the engine even after the radiator is drained

While the coolant is draining, take the opportunity to inspect the hoses and clamps

Look for cracks, swelling, or soft spots

Never reuse compromised components—they risk catastrophic failure

The cap’s seal and spring mechanism must be intact to preserve system pressure

Once the old coolant is fully drained, close the drain valve securely

Flushing ensures a clean slate before adding fresh coolant

Pour distilled or tap water into the radiator and run the engine at idle with the heater set to maximum

This helps flush out any remaining residue

Never drain hot water—it’s dangerous and can warp components

Repeat until the water runs clear

Repeat this step if the water comes out dirty

When the system is clean, it's time to refill with new coolant

Always use the type recommended by your vehicle’s manufacturer

Most modern vehicles require a 50 50 mixture of coolant and distilled water

50 blends that save time and ensure accuracy

Do not exceed the max level—coolant expands when hot

Overfilling can cause pressure buildup and lead to leaks or reservoir rupture

Run the engine at idle for several minutes with the cap removed

Watch for air bubbles rising to the surface

Keep the engine running until bubbles stop appearing

As air escapes, the fluid level will fall—top off gradually

Once no more bubbles appear, turn off the engine and let it cool

Tighten the cap until it clicks or locks into place

Recheck the overflow tank once the engine is completely cold

Add more 50

Look for drips, stains, or wet spots

Make sure the heater blows hot air, which confirms proper coolant circulation

Never dump it on the ground or down household drains

AutoZone, O’Reilly, and local garages often accept used antifreeze

Always use designated disposal sites

Consistent coolant service prevents costly repairs and keeps your vehicle running smoothly

By following these steps carefully, you can safely flush and replace your coolant without risking injury or damage to your vehicle