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Check the level of your coolant. If necessary, fill with a 50/50 mix of coolant and water.
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Check the tension of your serpentine belt. Tighten it if it is loose in order to provide proper power to your A/C compressor and your alternator.
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Unless you have a maintenance-free battery, check the level of the electrolyte in the battery. More batteries fail in hot weather than in cold weather.
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Leave the car windows open slightly when parking the car.
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Leave Fido at home, since just a few minutes in a parked car could be fatal to him.
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Park in the shade whenever possible.
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If it appears that your engine is overheating, pull over immediately, shut off the engine and don’t open the radiator cap.
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Check your tire pressure. Tires that are underinflated are more subject to blowout at high speeds in the summer than in the winter.
And, last but not least–
- DON’T warm up the engine!