What are the precautions for adding antifreeze?

[DelEmiliano]

Precautions for adding antifreeze: 1. Do not mix different types of antifreeze: Different types of automotive antifreeze have different properties, and mixing them may cause chemical reactions; 2. When replacing antifreeze, perform an internal cleaning of the cooling system to avoid residual scale. Antifreeze contains ingredients to remove scale, and if the scale is not cleaned promptly, it may affect the antifreeze's performance; 3. Avoid adding water to antifreeze. Adding water to antifreeze will increase its freezing point, reducing its cooling effectiveness. Additionally, tap water contains scale and other impurities, and long-term use may lead to sediment buildup and affect the performance of the vehicle's cooling system.

[McLena]

I just replaced the coolant for our family's old car recently, so here's my experience. Always wait until the engine is completely cooled before operating - last time I was too impatient and almost got scalded by the hot steam. Remember to choose the correct type, as different colored coolants have different formulations, and mixing them can cause clumping that blocks water channels. First check the MAX/MIN marks on the reservoir - if it's too low, there might be a leak. Pour slowly to avoid overflow that could corrode the paint. Most importantly, change it regularly - my car's manual specifies every two years, don't delay. After replacement, start the engine to let the water pump circulate it and monitor the temperature gauge. If you're unsure, it's most worry-free to pay for labor and let a repair shop handle it.

[LeOwen]

Over the years of maintaining my vehicle, I've summarized some antifreeze tips. Before refilling, completely drain the old fluid as mixing old and new will render it ineffective. Always dilute concentrated antifreeze with distilled water - tap water causes scaling. Wear gloves and goggles during operation; this stuff burns painfully if it contacts skin. The freeze protection rating of OEM antifreeze must match local winter temperatures, or you risk radiator cracking with greater losses. I make it a habit to check freezing points before winter using a hydrometer. For older vehicles, inspect hose seals as aged leaks can cause rapid coolant temperature spikes. Once I forgot to tighten the cap after topping up, and it all sprayed out mid-drive - a lesson worth remembering.

[JaydenAnn]

The key to adding coolant is not to operate on a hot engine; wait at least half an hour before starting. If you hear a hissing sound when unscrewing the expansion tank cap, it indicates there's still pressure inside. Do not fill beyond the MAX line, as thermal expansion can cause overflow. Mixing different brands is a major no-no, as glycol-based formulas can produce sediment. After the operation, turn the heater to the highest setting to ensure the coolant circulates throughout the entire cooling system. Southern car owners might think it's no big deal, but coolant also protects the engine in summer, with a much higher boiling point than water. If you're doing it yourself, prepare a drain pan—this stuff is environmentally harmful and requires professional disposal.