What is the Method for Selecting Antifreeze?
3 Answers
Antifreeze selection method is: 10 degrees Celsius lower than the winter temperature of your residence. The functions of antifreeze are: 1. Prevent corrosion in the engine cooling system; 2. Prevent water from boiling when the engine temperature reaches 100 degrees Celsius; 3. Prevent scale formation and avoid reducing the radiator's cooling effect; 4. Ensure the engine operates normally at low temperatures. The method for replacing antifreeze is: 1. Open the vehicle's engine hood, and the coolant reservoir can be seen in the upper right corner; 2. Open the antifreeze plug under the radiator to drain the old antifreeze; 3. Add new antifreeze, tighten the cap, and the antifreeze replacement is complete.
When it comes to choosing antifreeze, I first check my car manual to see what type the manufacturer recommends. For example, my car specifies using ethylene glycol-based antifreeze, and the freezing point should suit the local climate: choose -25°C for cold regions, and opt for a boiling point above 120°C in hot weather. Also, consider the color—green usually indicates traditional types, while red is better for rust prevention in newer cars. But don’t just rely on color; check the additive ingredients on the bottle label. Good antifreeze contains corrosion inhibitors to protect the engine from rust and scale buildup. When replacing antifreeze, avoid mixing old and new or different types, as this can cause chemical reactions that clog the system. I personally replace it every two to three years because the additives degrade over time, reducing effectiveness. Opting for reputable brands like Mobil is a safe bet for stable quality. If you tend to forget, keep a label note to remind yourself of the replacement schedule.
My experience is that the key to choosing coolant lies in protecting the engine from freezing or overheating. There are two main types based on composition: ethylene glycol and propylene glycol. Ethylene glycol is cheaper and offers better freeze protection but is slightly toxic, so wear gloves when handling it. Propylene glycol is more environmentally friendly but more expensive. Additives are the most crucial factor—high-quality coolants contain special formulations to prevent corrosion and extend lifespan. When purchasing, check the freeze and boiling points listed on the packaging to ensure it won't freeze below zero in winter or boil during summer heat. It's also essential to match the coolant to your vehicle model—don't mix different brands to avoid chemical conflicts. Follow the manual's recommended replacement interval, typically every two years. Regularly check the radiator fluid level and color changes; replace it early if it becomes cloudy. Buying a universal bottle for DIY freeze point testing is convenient and saves money on unnecessary rework.
