If you have a flat tire, you can fix it by changing it with a spare tire. Here's how to do it:

  1. Find a safe location to change the tire. If you are on the side of a busy road, try to pull as far off the road as possible and turn on your hazard lights. If you are in a parking lot or on a quieter road, you can change the tire there.

  2. Locate the spare tire, jack, and lug wrench in your car. In most cars, these can be found in the trunk or underneath the car.

  3. Loosen the lug nuts on the flat tire. Do not remove them yet. Use the lug wrench to turn the lug nuts counterclockwise to loosen them.

  4. Position the jack under the car. Consult your owner's manual to find the proper jacking point for your car.

  5. Lift the car off the ground using the jack. Turn the jack handle clockwise to lift the car.

  6. Remove the lug nuts and take the flat tire off. Place the flat tire under the car, near the jack, in case the jack fails.

  7. Put the spare tire on the car. Line up the holes in the spare tire with the lug bolts on the car.

  8. Hand-tighten the lug nuts onto the tire.

  9. Lower the car back to the ground. Turn the jack handle counterclockwise to lower the car.

  10. Tighten the lug nuts. Use the lug wrench to turn the lug nuts clockwise to tighten them.

  11. Replace the flat tire as soon as possible. A spare tire is not meant to be driven on for long distances or at high speeds.

It's important to use caution when changing a tire, as the car can fall off the jack if not properly supported. If you are unsure how to change a tire or do not feel comfortable doing it, it is recommended to call a professional or roadside assistance.

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