How to Replace Coolant in ix35?

[HaleyFitz]

Here are the steps to replace the coolant in ix35: 1. Unscrew the radiator cap, open the radiator drain valve (usually located at the bottom of the car), and drain the coolant. 2. Clean the cooling system by continuously injecting clean water into the engine cooling system. During the flushing process, keep the engine idling to maintain the circulation of clean water inside until clear water flows out from the radiator. 3. Stop adding water, wait for the water to drain completely, and then close the drain valve. 4. Add new coolant until the liquid level reaches between the MAX and MIN marks. 5. Close the cap, start the car, and let the engine idle for two to three minutes. The cooling system will expel internal air, causing the coolant level to drop slightly. At this point, you should add more coolant to top it up.

[Mitch]

I noticed several key points when I last changed the coolant for my ix35 by myself. First, park the car on level ground and wait until the engine cools down completely to avoid burns. Then, unscrew the plastic drain valve at the bottom of the radiator, and the old coolant will gush out—remember to catch it with a basin. Once it’s fully drained, tighten the valve. Here’s the crucial part: locate the overflow tank (the white translucent plastic container in the engine bay) and disconnect the return hose to completely drain the old coolant. For the new coolant, make sure to use the Hyundai-approved green fluid, and pour it into the overflow tank until it reaches the mid-level mark. Start the engine and turn the heater to the highest setting. Wait until the fan cycles twice, and the coolant level will drop—top it up to the marked line to finish. Throughout the process, never mix coolants of different colors, as it can damage the engine.

[VonJanelle]

Changing the coolant yourself is really not difficult. I've done it three times this way. When the engine is cold, first unscrew the main radiator cap to release the pressure, then place a rag under the car. The drain plug for the ix35 is at the bottom left corner of the radiator and can be loosened with slip-joint pliers. While draining the fluid, check the connecting hoses for any cracks. The key is to prepare enough distilled water for flushing: after draining the old fluid, close the valve, add distilled water, start the engine, and let it circulate for ten minutes before draining again. Repeat this twice to thoroughly remove any residue. Finally, when adding new coolant, remember to pour it slowly while squeezing the hose to release air. Make sure to use exactly 4 liters, and keep the level in the auxiliary reservoir between MAX and MIN for safety.

[OGianna]

When replacing the coolant, special attention must be paid to the bleeding operation. My experience is to open the auxiliary reservoir cap when the engine is cold to start draining, then close the drain valve after the flow stops. Adding new coolant directly into the main radiator can trap air bubbles. The correct method is to slowly pour the new coolant into the auxiliary reservoir fill port. After starting the vehicle, turn the heater knob to the HI position. When the temperature gauge reaches the midpoint, lightly press the accelerator to maintain 2000 RPM. At this point, you'll notice the coolant level suddenly drop—quickly top it up. Repeat this process until the level stabilizes. Finally, fill the auxiliary reservoir to the midpoint, tighten the cap, drive a few kilometers, and then recheck the fluid level.

[DelPeter]

Considering environmental protection, here's a detail to share: Waste antifreeze should be stored in sealed containers and sent to auto repair shops for proper disposal. When I change the fluid, I prepare a large graduated container in advance to accurately measure the amount of waste liquid recovered. Always wear rubber gloves and goggles during operation, and rinse immediately if the green liquid comes into contact with skin. For the Hyundai ix35, it's recommended to use G48 type antifreeze – never opt for cheap, unbranded products. After the initial refill, be sure to check the fluid level again the next day as escaping gases may cause the level to drop. This maintenance task is best performed every two years, and replacing it before winter also allows for convenient freezing point testing.

[Zelda]

Parents with children, pay attention to safety: Remove the engine guard plate when the car is cold to access the drain valve. Use your phone to take a photo under the car to locate the radiator position—the green hexagonal valve is the drain port. My habit is to lay three layers of plastic bags underneath before removing the valve to catch the fluid and prevent splashing. The hardest part of fluid replacement is bleeding the air—you can loosen the clamp at the heater hose to release trapped air. Testing is simple: Drive for about three kilometers; if the coolant temperature is normal and the heater blows hot air, there’s no airlock. Finally, remember to tighten the auxiliary reservoir cap properly, or it may leak during long trips. It’s recommended to replace the coolant every 40,000 kilometers to extend the lifespan of hoses and the water pump.