The Do's & Don'ts of Car Defrosting (2024)

Table of Contents
Do Don't Do Do Don't Do Don't FAQs

Health and wellness

October 30, 2017

When the mercury drops, Canadian drivers know that a whole new set of car care tasks are required during the colder months.

Unfortunately, winter brings its ownset of challengesin the form of dead batteries, frozen door locks, and frosted windshields.

Rushing through common cold-weather car tasks can cause more harm than good, however. When it’s time to defrost your car’s windshield, take care to heed these simple do’s and don’ts to get the job done properly, without damaging your vehicle.

Do

…start your car and turn on the defroster

The first step to properly defrosting your windshield is getting into your vehicle and turning it on. Then, turning on your heating to the “defrost” setting, and waiting 5minutes to 15minutes for your windshield to warm up and begin to defrost.

Don't

…use a hairdryer or portable heater

When you’re running late for work and wake up to a windshield covered in ice, or a car door frozen shut, it might be tempting to try to accelerate the melting process by using a hair dryer or portable heater. However, this is dangerous and should not be attempted– although it may take a little longer, try instead the other safe ice removal methods outlined below.

Do

…use a store-bought or home-made de-icing spray on your windshield

De-icing solutions, such as “MotoMaster Windshield & Window De-icer,” are readily available at most car supply stores. If you’d rather take the DIY route, you can also make a home-made de-icing spray with a saltwater or alcohol solution.

To make a saltwater de-icer, simply mix a few teaspoons or table salt, or road salt, to a spray bottle filled with water. Be sure to use this spray sparingly, as heavy salt exposure may cause damage to your windshield.

To make an alcohol solution, simply mix one part water and two parts 70% isopropyl alcohol in a spray bottle. Whether you’re using saltwater or alcohol, when you spray these onto your icy windshield, the frost will begin to dissolve, while the ice will begin to melt and break apart. At this point, you can use your ice-scraper to remove whatever ice or frost is left on your windshield.

Do

…pour cold to lukewarm water on a frozen door handle

To help de-ice a frozen-over door handle, pour lukewarm or cold water over the handle to melt the ice. The ice will then become soft enough so that you can wipe it away using a sturdy rag or even with your gloved hands.

Don't

…pour hot water on a frozen windshield

Pouring piping hot water onto your icy or frosted windshield can cause cracks in the glass. What’s more, in extra cold temperatures, hot water thrown into the air actually turns into powder upon contact with the freezing cold air.

Do

…use a plastic ice scraper and soft brush

The handy ice-scraper is the go-to option for ice removal– however, not all ice scrapers are created equal! It’s wise to choose a scraper with a soft brush on one end, and to make sure that the scraper you choose is made of plastic rather than metal. You can help to loosen and break apart the frost and ice with the brush end, and then remove thicker patches of ice with the scraping end.

Don't

…use a spatula, key, or metal scraper

If you don’t have a plastic ice scraper, it’s not a good idea to reach for a metal alternative, such as a spatula, a car key, or even a metal scraper. You may very well scratch your windshield or damage the paint of your vehicle by using a metal object to remove frost and ice.

Defrosting your car isn’t necessarily a pleasant task, but it is a necessary one come winter in Canada. Use these tips to avoid damaging your car in the process, so that you can get back on the road sooner.

These tips are provided for information and prevention purposes only. They are general in nature, and DesjardinsInsurance cannot be held liable for them. We recommend using caution and consulting an expert for comprehensive, tailored advice.

In Quebec, DesjardinsInsurance refers to DesjardinsGeneralInsuranceInc. In Ontario and Alberta, Desjardins Insurance refers to Certas Direct Insurance Company, underwriter of automobile and property insurance.

The Do's & Don'ts of Car Defrosting (2024)

FAQs

The Do's & Don'ts of Car Defrosting? ›

DO pour cold to lukewarm water on the windshield to help the defrost process along. You can also do this to any frozen-over door handles. DON'T pour hot water onto a frosty or icy windshield. Just as with other heat sources, this can crack the glass.

What not to do when defrosting a windshield? ›

During winter, people employ many de-icing techniques that they might not know are damaging their cars.
  1. Don't use hot or warm water. ...
  2. Don't rush the defrosting process. ...
  3. Avoid wiping the inside of the windscreen with a piece of cloth. ...
  4. Don't use your windscreen wipers until all the snow has melted. ...
  5. Don't leave your car running.
Jan 19, 2022

How to properly use defrost in a car? ›

TO DEFOG YOUR WINDSHIELD
  1. Press the Defog/Defrost button. ...
  2. Turn off the Recirculation button if it's on.
  3. Press the Sync button (if equipped).
  4. Set the fan to the highest setting.
  5. If defrosting, set the temperature to High (automatic system) or Full Hot (manual system).
  6. If defogging, turn the A/C to On.

How long should you let your car defrost? ›

Do. The first step to properly defrosting your windshield is getting into your vehicle and turning it on. Then, turning on your heating to the “defrost” setting, and waiting 5 minutes to 15 minutes for your windshield to warm up and begin to defrost.

Does AC need to be on for defrosting a car? ›

The defrost function of a vehicle may not work properly if the air conditioning system is not working. As mentioned earlier, the air conditioning system is used to dehumidify the air, which is essential for the defrost function to work effectively.

Can defrost crack your windshield? ›

If there is ice on the windshield, you turn on the defrost setting. You may think not turning on the heat will prevent further cracking, but the defrost will cause a rapid increase in temperature that causes the glass to expand, outing pressure on the glass that can cause the crack to expand or grow.

Does rubbing alcohol help defrost windshield? ›

Rubbing alcohol! Mix ⅓ water and ⅔ isopropyl or rubbing alcohol together in a spray bottle. Spray the solution directly onto your front and back windshield and watch the ice melt instantly. "Because alcohol has a very low freezing point, it causes the ice to break up and melt," explains Burkhauser.

Do you use hot or cold air to defrost your windshield? ›

Hot and dry air can hold much more water than cold and wet air, so the fastest way to defrost your windshield is to make the air around it as hot and dry as possible. Heat is self-evident; the other three steps—air conditioning, turning off air recirculation, and cracking the windows—helps keep the air dry.

Do you use cold or hot air to defog windows? ›

The fastest way to defog your windshield and windows, according to Road and Track: Turn the heat on its maximum setting, because hot air can hold more moisture. Turn the AC on, which will pull the moisture from the air as it passes over the cooling coils.

How do you defrost effectively? ›

When thawing frozen food, it's best to plan ahead and thaw in the refrigerator where it will remain at a safe, constant temperature — at 40 °F or below. There are three safe ways to thaw food: in the refrigerator, in cold water, and in the microwave. In a hurry? It's safe to cook foods from the frozen state.

Can I leave my car on to defrost? ›

Leave the engine running while stationary

However, not only is this an inefficient way of defrosting the car (you could be waiting 10 minutes or more) it's also bad for the environment. Stationary idling – which means leaving the engine on while the car is on a road and not moving – is also a traffic offence.

Will vinegar melt ice on a windshield? ›

Yes and no. Vinegar is more effective when you apply it on your windshield the night before you expect any ice to form since the acetic acid in the vinegar lowers the freezing point of water. If you try to spray vinegar on your windshield after the ice has formed, then it won't be as effective.

Why does my car take forever to defrost? ›

If you're finding it takes a longer time than you'd expect, the culprit is often your cabin air filter. This is true for all models of vehicles. In order for the maximum amount of heat to pass from the engine compartment, through your vents, and onto the windshield, the system must be free from obstruction.

How long should I leave my AC off to defrost? ›

Your AC will take anywhere from an hour to more than a day to completely defrost. It's important to catch it early to prevent further damage to your unit—and, of course, so you're without cool air for the shortest amount of time possible.

When should I turn my AC back on after defrosting? ›

The fan will slowly defrost the system. Once your air conditioner is ice-free, you can turn it back on and reset the fan to auto (This may take an hour or more).

Does freon affect defrost? ›

Low refrigerant levels can affect the efficacy of your front defroster because it's powered by your car's A/C system. Refrigerant is not only used to cool your car but is a key element in the defrosting process.

How do you defrost a windshield ASAP? ›

Hot and dry air can hold much more water than cold and wet air, so the fastest way to defrost your windshield is to make the air around it as hot and dry as possible. Heat is self-evident; the other three steps—air conditioning, turning off air recirculation, and cracking the windows—helps keep the air dry.

How to prevent frost on windshield overnight? ›

Create a De-Icer Solution – A mixture of two parts rubbing alcohol and one part water can be placed in a spray bottle and applied to your vehicle each night when you get home. This mixture has a lower freezing point than water and will keep your car ice-free overnight.

Can you use a hair dryer to defrost a windshield? ›

Keys, spatulas, utility knives and metal ice scrapers can create grooves in your windows that could later become cracks. You should not try to force your door open with any tool because you might damage the seal. Using a hair dryer to melt the ice is definitely not a good idea.

What is the fastest way to melt ice on a windshield? ›

Mix three parts vinegar and one part water or two parts rubbing alcohol and one part water in a spray bottle. Turn on your car so the defroster can start warming up the inside of the vehicle. Spray your windshield with the solution and wait 15 to 30 seconds while the ice softens and melts.

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