What are the steps for replacing coolant?
2 Answers
The steps for replacing coolant are: 1. Unscrew the radiator cap, open the radiator drain valve, and drain the antifreeze; 2. Clean the cooling system: Insert a rubber hose connected to a tap into the radiator filler port, turn on the tap to allow a continuous flow of tap water through the engine cooling system. During the flushing process, keep the engine idling and continue the operation until clear water comes out of the radiator; 3. Turn off the tap, wait until all water in the cooling system is drained, then close the radiator drain valve; 4. Add antifreeze from the radiator filler port until the radiator is full. Unscrew the reservoir cap, add antifreeze up to the Max mark, being careful not to exceed it; 5. Replace and tighten the radiator cap and reservoir cap; 6. Start the engine and let it idle for 2 to 3 minutes, then unscrew the radiator cap. As some air is expelled from the cooling system, the antifreeze level will drop. At this point, add more antifreeze until it reaches the Max mark; 7. Securely replace the radiator cap.
That time I changed the coolant myself was a real lesson. First, you have to wait until the car is completely cool – never twist the radiator cap when it's hot to the touch! Place a large pan under the drain plug at the bottom of the car and slowly open it to drain the old fluid. Here's a key point: many cars require removing the thermostat to fully drain the old coolant. When buying new coolant, you must strictly follow the manufacturer's specified color and type, mixing it with distilled water. When refilling with new coolant, loosen the bleed screw at the highest point of the heater hose, slowly adding fluid while releasing air bubbles. Last time, I didn't fully bleed the air, and the temperature gauge went haywire. Finally, fill up to the MAX line in the expansion tank and take a test drive. Wait until the fan kicks in, then top it up to the middle line – the whole process really tests your patience.
