Will Car Windshield Washer Fluid Evaporate?
2 Answers
Car windshield washer fluid will evaporate slightly. Below is an introduction to the functions of car windshield washer fluid. Cleaning Performance: Windshield washer fluid is formulated with various surfactants and additives. Surfactants typically have functions such as wetting, penetrating, and solubilizing, thereby achieving cleaning and stain removal effects. Antifreeze Performance: It can significantly lower the freezing point of the liquid, providing antifreeze protection and quickly dissolving frost. Anti-Fog Performance: A single-molecule protective layer forms on the glass surface. This protective film prevents the formation of fog droplets, ensuring the windshield remains clear and transparent with unobstructed visibility. Anti-Static Performance: After cleaning with windshield washer fluid, substances adsorbed on the glass surface can eliminate static charges on the glass, providing anti-static properties.
Last time I topped up the windshield washer fluid, I noticed it had decreased after three months. Research shows it does evaporate, primarily due to water loss. Especially in summer when parked under the sun, engine compartment temperatures can exceed 60°C, causing liquid in poorly sealed reservoirs to gradually turn into vapor and escape. However, the cleaning agents and antifreeze components in washer fluid have low volatility, so mainly water evaporates, leaving the remaining liquid more concentrated. This may reduce cleaning effectiveness. It's recommended to check fluid levels monthly during summer and park in shaded areas when possible. Additionally, upgrading the reservoir cap's seal can effectively slow evaporation – an important detail for older vehicles in particular.
