How to Replace the Antifreeze in the Nissan Sylphy Classic?

[DiMartin]

The method for replacing the antifreeze in the Nissan Sylphy Classic is as follows: 1. Drain the old antifreeze; 2. Clean the fluid channels with water; 3. After draining, add the new antifreeze through the radiator hose; 4. Add another bottle of antifreeze to the antifreeze reservoir until it is full. The Nissan Sylphy Classic is a compact car under Dongfeng Nissan, with body dimensions of 4631mm in length, 1760mm in width, and 1503mm in height, a wheelbase of 2700mm, and a fuel tank capacity of 50 liters. The Nissan Sylphy Classic is equipped with a 1.6L naturally aspirated engine, delivering a maximum horsepower of 122ps, a maximum power of 90kW, and a maximum power speed of 6000rpm, paired with a 5-speed manual transmission.

[CaydenRose]

Replacing the coolant for Nissan Sylphy Classic is actually not difficult. I've done it myself for all three family cars. First, always perform this operation on a cold engine to avoid burns from hot coolant. Unscrew the drain plug at the bottom of the radiator and collect the old fluid in a basin – this toxic substance must be properly disposed of. After complete drainage, tighten the plug and pour new coolant into the reservoir up to the MAX line. Start the engine with heater set to maximum for 10 minutes to circulate, then shut off after the cooling fan activates and top up to the standard level. Always use the correct specification, such as the OEM blue long-life type, as mixing types can cause scaling and radiator corrosion. Remember to change it every 2 years or 40,000 km – last week I found the old fluid had turned brown and its cooling efficiency had significantly degraded.

[McBeau]

Before starting, always refer to the manual to confirm the drain valve location. For the Nissan Sylphy Classic, it's typically at the lower left corner of the radiator. Prepare 4-6 liters of new coolant, a drain pan, gloves, and goggles. When the engine is cold, open the expansion tank cap to release pressure, then unscrew the drain valve to completely empty the system. If possible, flush the pipes twice with distilled water for a more thorough clean. Pour slowly when refilling to prevent air bubbles. After filling to the MAX line, start the engine and turn on the heater to bleed air from the cooling system, topping up as the level drops. The key step is testing the coolant's freezing point—repair shops have test pens, and it must withstand -25°C to be considered qualified.

[DiZoe]

Expired antifreeze can lead to three major issues: First, the corrosion inhibitors fail, causing damage to aluminum radiators—my old Sylphy once leaked due to this. Second, the freezing point rises, potentially cracking pipes. Third, sediment buildup can clog the heater core. When replacing, remember two key points: Always perform the task on a cold engine to prevent steam burns, and avoid filling beyond the MAX line to prevent excessive pressure. Use the same-color OEM formula, as mixing can create flocculent deposits. The basic process involves draining the old fluid—flushing—refilling with new fluid—bleeding the system—and topping up.