Preparing your car & clearing snow and ice safely
Give yourself an extra 15 minutes before every winter drive. Rushing out with a tiny peephole scraped in the windshield—or pouring hot water on frozen glass—is how winter mornings turn into costly accidents.
If you only do three things
- Never pour hot or warm water on an icy windshield—thermal shock will crack or shatter the glass immediately.
- Brush ALL snow off the roof, hood, headlights, and taillights of your car before pulling onto the road.
- Make sure your windshield washer fluid is winter-rated (-20°F/-29°C blue or purple fluid), never plain water or summer bug-wash.
How to clear a frozen windshield in 5 minutes
- Start the car (outdoors, never inside a closed garage) and make sure the exhaust pipe at the back is not buried in snow.
- Turn the front and rear defrosters to HIGH heat, fan on high, and turn Air Conditioning (A/C) ON—the A/C compressor dries the cabin air so the inside of the glass does not fog up.
- Turn OFF recirculation so fresh dry air enters.
- While the glass warms from the inside, brush loose snow off the roof, hood, and side windows.
- Use a plastic ice scraper—never a metal spatula or shovel—to push the loosened ice off the glass.
Why clearing the roof of your car is critical
If you leave a slab of snow on your car roof, two things happen as the cabin warms up: either the entire sheet slides forward onto your windshield the first time you hit the brakes (blinding you in traffic), or it flies backward at 60 mph and smashes the windshield of the driver behind you. In many states, driving with snow on your roof carries heavy fines.
Frozen wipers, frozen doors, tire pressure, and batteries
- Windshield wipers: Never turn on your wipers when they are frozen stuck to the glass—you will tear the rubber blades or burn out the wiper motor fuse. Gently free them by hand after the defroster warms the bottom of the glass.
- Doors frozen shut: Do not yank harder on the exterior door handle—cold plastic snaps easily. Instead, lean your hip or palm against the door frame and push INWARD first to crack the ice seal around the rubber gasket.
- Tire pressure light came on: Air contracts in the cold. Tires lose about 1 PSI for every 10°F (5.5°C) drop in temperature. Inflate your tires to the number printed on the sticker inside your driver's door jamb.
- Gas tank & EV battery: Keep your gas tank at least half full in winter so fuel lines don't freeze and you have heat if stranded. In electric vehicles (EVs), expect 20% to 35% less range in freezing weather—preheat the cabin while the car is still plugged into wall power.
Related guides
- Driving in snow for the first time: Core driving rules on snow and ice.
- What to do if your car slides on ice: How to recover from a skid safely.