Can I replace the coolant by myself?
3 Answers
It is possible to replace the coolant by yourself. The method for self-replacement is as follows: 1. Unscrew the radiator cap and open the radiator drain valve to release the coolant; 2. Keep the engine idling, insert a hose into the radiator, and continuously inject clean water into the engine cooling system for cleaning; 3. Stop injecting clean water, wait until the water has completely drained, and then close the drain valve; 4. Fill with new coolant until the liquid level is between the max and min water level marks; 5. Replace the radiator cap and reservoir cap, and tighten them; 6. Start the car and let the engine idle for two minutes, then top up the coolant to the max mark.
Changing the coolant yourself is completely doable, I do it often. The key is to prepare the same type of coolant—never mix different colors or formulations, as corroding the radiator would be a real headache. When performing the operation, always wait for the engine to cool completely before opening the radiator cap; scalding is no joke. When catching the old fluid with a basin, remember to lay down plastic sheeting—this stuff is terrible for concrete and plants. The trickiest part is bleeding the air—you’ll need to start the engine and wait for the coolant temperature to rise, squeezing the hoses while topping up the fluid until warm air blows out, indicating the system is fully purged. Finally, take the old coolant to an auto shop for proper disposal—never pour it down the drain to avoid environmental pollution.
As a veteran driver, I advise beginners to be cautious! The two biggest fears when changing coolant yourself are not draining the old fluid completely and failing to remove all air bubbles. Residual old fluid can halve the effectiveness of the new coolant, potentially causing the radiator to freeze and crack in winter. Incomplete air bleeding may lead to overheating – once my apprentice didn't bleed properly, and the dashboard temperature gauge immediately shot into the red zone. Essential tools include: radiator wrench, drain pan, funnel, and distilled water. After draining the old fluid, you must flush the system twice with distilled water until clear liquid flows out. Finally, mix coolant and purified water according to the manual's ratio. For northern friends, be sure to use a -25°C antifreeze model for reliable winter protection.
