How to safely restart and prepare a car after months of winter storage in a garage.
A car that spent the winter parked in a garage isn’t automatically ready for the road. Firing it up and driving off right away isn’t the best move. Experts say long-term inactivity can be more damaging than occasional use. Here’s how to properly prepare your vehicle after months of storage.
A dead battery is the most common post-winter issue. Even a new battery can fully discharge after a month of sitting—older ones even faster. If an alarm system or other electronics stayed on, the battery is almost certainly drained.
In many cases, the car won’t start—and if it relies on a key fob, you may not even be able to unlock it. A portable jump starter can help. These compact devices deliver enough peak current to start the engine and unlock the doors.
Next, inspect the battery. Check the terminals for corrosion and clean them if needed. Then try starting the engine. If it turns over, you’re in luck. If not, you’ll need a jump-start from another vehicle or remove the battery for charging or replacement.
During long storage, oil drains down into the oil pan, leaving internal components dry. At the same time, condensation can form and mix with the oil. Over time, contaminants settle and combine with engine wear particles.
Starting an engine with degraded oil is risky. Before the first startup, drain the old oil and replace it with fresh oil—along with a new filter. Let the engine idle so the oil can warm up and circulate.
Experts also recommend disabling the fuel and ignition systems before the first start, then cranking the engine for 15–20 seconds. This allows oil to circulate through the system before combustion begins.
Coolant and other fluid levels may drop during storage, which can indicate a leak. It’s important to locate and fix any issues before driving.
Before hitting the road, check all fluid levels and top them off. Ideally, replace them entirely, as fluids can degrade over time and lose their protective properties.
If the fuel wasn’t drained before storage, condensation may have formed inside the tank. Gasoline can also degrade over time, making it less effective and potentially harmful.
Experts recommend draining old fuel and refilling with fresh gasoline. Replacing the fuel filter is also a smart move.
When a car sits in one position for months, its tires can develop flat spots from supporting the vehicle’s weight. This leads to uneven wear, lower pressure, and a higher risk of damage.
Before driving, inspect the tires for cracks or deformities. Replace them if necessary and make sure they’re inflated to the proper PSI.
Seals and gaskets can dry out during long periods of inactivity. Over time, they may crack or deteriorate—especially if they’re already several years old.
Once the engine starts, oil pressure rises quickly, which can stress weakened hoses and seals. This can lead to leaks and loss of system pressure.
Address these issues promptly. Damaged rubber components will continue to degrade and could fail at the worst possible moment.
Long periods of inactivity can harm the A/C system. When in use, it circulates both refrigerant and compressor oil. Without regular operation, lubrication dries up, leaving components vulnerable to wear and corrosion.
This can lead to refrigerant leaks and eventual system failure. There’s also a health risk: bacteria such as Legionella can grow in an unused system and spread through the cabin air, potentially causing serious respiratory illness.
Before driving, check the A/C system, repair any issues, and disinfect it.
Even garage-stored cars aren’t immune to rust. Moisture can still cause corrosion over time.
Inspect the body for rust spots and treat it with rust protection if needed. Pay close attention to door sills and lower panels.
Poor ventilation during storage can lead to mold and mildew inside the cabin. There’s also a chance rodents may have moved in.
Before driving, thoroughly clean the interior and refresh the upholstery. Don’t forget to lubricate rubber seals around doors and windows to keep them in good condition.