Do Sedans Have a Radiator and Need Water Refill?
3 Answers
Sedans do have a radiator and require water refill. Generally, when a car is low on coolant, water is added as a temporary solution. Precautions for adding water to a new car are as follows: 1. Do not use ordinary water as a substitute for coolant; 2. Avoid mixing coolants of different colors and specifications; 3. When using coolants from different brands, try to drain the original coolant from the cooling system thoroughly; 4. Regardless of high or low temperatures, coolant should be used for the efficiency and longevity of the cooling system; 5. Tap water contains many substances that can easily cause rust and scale buildup. Coolant, on the other hand, can lower temperatures, regulate heat, and is less prone to deterioration and chemical reactions.
Sedans do have a coolant reservoir, but nowadays it's commonly referred to as the coolant expansion tank. It's definitely not meant for tap water - only specialized coolant should be used. I've seen many car owners pour mineral water directly into it, resulting in frozen and cracked pipes in winter or overheating breakdowns in summer. Coolant has a high boiling point and low freezing point, protecting aluminum alloy engines from rust. See that transparent plastic tank when you open the hood? Just keep the fluid level between the MIN and MAX marks. It's best to have the freezing point tested at a repair shop before winter each year. If the color appears yellowish or cloudy, it's safer to replace it outright. Never take this lightly - if problems occur and the engine overheats, a major repair could cost tens of thousands.
Of course there's a coolant reservoir, that translucent plastic tank in the engine bay. But we professionals call it the expansion tank - its main function is providing expansion space for circulating coolant. Never fill it with tap water, mineral deposits will clog the radiator fins and engine overheating becomes a serious risk. In my 15 years as a mechanic, I've seen countless thermostats jammed due to tap water usage. Recommend complete ethylene glycol coolant replacement every two years - red or green color doesn't matter, just never mix different formulations. Check fluid levels during routine car washes - consistent drops likely indicate leaks. Remember never to open the cap when hot - pressurized steam can literally scald your skin off.
