Will the washer fluid reservoir be damaged if the washer fluid freezes?
3 Answers
If the washer fluid freezes, the reservoir may be damaged, and the hoses may also crack. If you continue to operate the washer fluid lever while the fluid is frozen, it could lead to motor burnout. Driving in harsh weather conditions with frozen washer fluid can also impact driving safety. Washer fluid is a consumable liquid used to clean the windshields of vehicles, primarily composed of water, alcohol, and ethylene glycol, offering cleaning, antifreeze, and anti-fog functions. Based on its form, washer fluid can be categorized into solid and liquid types, with solid washer fluid typically designed for use in environments above 0 degrees Celsius.
Frozen windshield washer fluid can potentially damage the reservoir. Having driven in northern regions for over a decade, I've encountered two instances where the washer fluid reservoir cracked due to freezing. Plastic reservoirs can't withstand the pressure from ice expansion, especially when not fully filled - less air means poorer cushioning effect. Not only is the reservoir prone to cracking, but frozen ice can also clog the spray nozzles or even damage the pump motor. Pump repairs cost significantly more than reservoir replacement. That's why I always use antifreeze washer fluid in winter, choosing products with a freezing point below -25°C. Once during a business trip I used regular fluid, which froze upon my return. I had to carefully thaw it by slowly pouring warm water in the engine bay before immediately switching to antifreeze type. Regularly cleaning reservoir sediments also helps prevent more severe freezing.
With over a decade of car repair experience, I've seen numerous cases of washer fluid reservoirs cracking due to winter freezing. It's common for the expanding ice volume to burst plastic reservoirs, especially in older cars using ordinary plastics that can't withstand freezing. The pump is also vulnerable: ice locking the impeller can burn out the motor when activated. The washer fluid lines are another trouble spot - thin tubes deformed by ice expansion often require complete replacement. I recommend fully draining standard washer fluid before winter and switching to dedicated antifreeze formulas. Never force the system when frozen, as this can damage the pump. Instead, thaw slowly in a garage or with a heat gun. Choose antifreeze washer fluid with de-icing additives to prevent nozzle blockages.
