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Aside from routine maintenance (tune-up, oil and filter change, belt and hose inspection), a cooling-system check is probably the most important cooler-weather maneuver. Consult your owner's manual for the proper mix of antifreeze and water. Affordable hydrometers help reveal a weak or strong ratio.
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In the summer, many of us fill the windshield-squirter reservoir with plain water. However, if the water freezes, it can crack the reservoir. "De-icer" washer fluids are formulated to work in subfreezing weather.
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Check your wiper blades for cracks and other signs of deterioration. In general, blades should be changed yearly. Replacing the entire assembly is easier than sliding in rubber refills. Consider using "winter blades"?their frames are wrapped in rubber to help ward off ice.
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Weatherstripping can freeze overnight, effectively locking the doors shut. To prevent this, coat the door and trunk rubbers with silicone spray.
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Door locks can be unfrozen using a few different methods. De-icing sprays and battery-powered probes are available from the automotive aftermarket. Heating the door key with a lighter usually works too.
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Particularly if your car is parked outside in the autumn, vacuum all leaves and debris out of the vent ducts. Otherwise, this material can decompose in the system, affecting the air quality inside your car. Asthmatic occupants will appreciate it.
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Try the heater before the weather turns. In older vehicles, the controls use a vacuum-actuated valve, which can wear out.
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Batteries produce less juice in colder weather. Ensure all available cranking power gets to the starter by keeping the battery terminals clean with a mild solution of baking soda and water or with special corrosion-absorbing pads around the posts.
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Check for exhaust leaks. In cold weather, we tend to sit in idling cars with the heater on to stay warm, and misdirected exhaust fumes can come inside?sometimes with deadly consequences.
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