Frequently Asked Questions

Do you know what to do if your car overheats? What if a fuse burns out? At AC Auto Service Center, our technicians get asked these and many other questions. We’ve compiled a few of our most frequently asked questions below to ensure that our customers are always prepared. You have a question not listed below? Give us a call! One of AC Auto’s ASE Certified Master Technicians will be happy to answer any automotive question you might have.

  • How often should I change my oil in Winston-Salem?

    Most vehicles need oil changes every 3,000 to 5,000 miles, depending on your vehicle type and driving habits. Frequent short trips or stop-and-go traffic can require more frequent service. At AC Auto, we clearly communicate recommended intervals based on your specific vehicle and how you drive it.

  • What does a check engine light usually mean?

    A check engine light can indicate anything from a loose gas cap to a serious engine issue. Advanced diagnostic tools are needed to read fault codes and identify the root cause. At AC Auto, we use specialized equipment to interpret these codes accurately and explain exactly what repairs are needed.

  • When should I get my brakes inspected?

    You should inspect brakes if you notice noise, vibration, or reduced stopping power. Early warning signs help prevent major issues and maintain safety. At AC Auto, we perform complete brake inspections to identify problems before they become costly repairs.

  • What's included in routine vehicle maintenance?

    Routine maintenance includes inspections, fluid checks, filter replacements, and scheduled service intervals based on your vehicle's needs. These services help reduce the risk of breakdowns and extend vehicle life. At AC Auto, we tailor maintenance plans to your vehicle type and driving habits.

  • How do I know if my transmission is failing?

    Common signs include slipping gears, delayed shifting, unusual noises, or fluid leaks. Thorough diagnostics are essential before recommending any repairs. At AC Auto, we diagnose transmission issues accurately to restore reliability and prevent further damage.

  • Can uneven tire wear be fixed with alignment?

    Yes, proper wheel alignment helps prevent uneven tire wear and improves handling and tire longevity. Alignment adjustments correct pulling and ensure stable, safe driving. At AC Auto, we pair alignment with tire services for optimal performance and extended tire life.

  • Why is my car's AC blowing warm air?

    Warm air typically results from low refrigerant, a failing compressor, or system leaks. Full HVAC diagnostics identify the exact issue so repairs address the root cause. At AC Auto, we handle all aspects of AC repair to restore proper cabin climate control year-round.

  • What does a vehicle diagnostic test check for?

    Diagnostics identify root causes of warning lights, performance issues, and unusual vehicle behavior using advanced tools. This covers engine, electrical, and drivability concerns to prevent repeat problems. At AC Auto, we perform precise diagnostics to help you avoid unnecessary repairs and costs.

  • How long does an oil change take?

    A standard oil change is completed efficiently, typically within 30 to 45 minutes, to minimize your downtime. The service includes fluid top-offs for coolant, brake fluid, and transmission fluid. At AC Auto, we use quality oils and filters to maintain engine performance.

  • What's the biggest mistake people make with diesel engines?

    Many diesel owners skip regular maintenance or ignore early warning signs, which can lead to costly fuel system or injector problems. Diesel engines require experienced diagnostics and preventative care to maintain durability. At AC Auto, we focus on long-term diesel performance for both personal and work vehicles.

  • Does hot weather in North Carolina affect my car's cooling system?

    Yes, hot summers in Winston-Salem put extra strain on your cooling system, increasing the risk of overheating if coolant is low or the system has leaks. Regular fluid checks and inspections help prevent breakdowns during peak heat. At AC Auto, we ensure your vehicle stays cool and reliable year-round.

  • What causes a rough ride or poor handling?

    Worn shocks, struts, or misalignment typically cause rough rides, pulling, and uneven tire wear. Suspension repair improves comfort, handling, and tire longevity. At AC Auto, we address steering and ride issues to maintain safe and stable driving conditions.

  • How often should I rotate my tires?

    Your tires should be rotated every other oil change, or every 6000 miles. Neglecting to rotate tires is a major cause of premature tire wear.

  • Is it really necessary to replace my timing belt at the recommended interval?

    YES. The failure of a timing belt in many cars can result in major engine damage. The cost of repairing an engine with a broken timing belt is much greater than the cost of a timing belt replacement.

  • What does it mean if my “check engine” or “service engine soon” light comes on?

    There are many sensors and computerized components that manage your vehicle’s engine performance and emissions. When one of these fails, the “check engine” light is illuminated. Although your car may seem to run fine, it is important to have the issue addressed to prevent long-term problems.

  • What should I do if my car starts to overheat?

    This is a very serious problem – if your car overheats for too long, you can damage your engine. As soon as possible, find a safe place to pull off the road and shut the engine off! Do not attempt to check the fluid level in the radiator as it can burn you. The best thing to do is have your car towed to AC Auto Service Center.

  • When should I get my oil changed?

    You should get your oil changed every 6000 miles or as recommended in your vehicle’s owner’s manual.

  • What is that milky brown engine oil?

    Milky brown engine oil is an indication of coolant in the oil. This can be caused by a blown head gasket (other gasket), a failed transmission cooler, or cracked casings. This condition is very serious and needs to be checked by a professional technician quickly.

  • How to make sure my car battery has a good electrical connection?

    Battery cables and terminals should also be cleaned and inspected to make sure they provide a good electrical connection.

  • What is synthetic motor oil?

    Synthetic motor oils can be a good choice for high output, turbocharged or supercharged engines, vehicles that are used for towing (especially during hot weather), or vehicles that are operated in extremely cold or hot climates. Synthetic motor oils, though more expensive than mineral-based motor oils, can improve fuel economy and provide longer intervals between changes.

  • When should I replace my car’s fuel filter?

    To help ensure dependable, trouble-free performance, replace your car’s fuel filter approximately every 30,000 miles or as recommended in your vehicle’s owner’s manual.

  • When should I change my spark plugs?

    For maximum fuel economy and peak engine performance, your spark plugs should be replaced every 30 months or 30,000 miles, unless your vehicle is equipped with 100,000-mile platinum tipped spark plugs.

  • I need to replace a burned out fuse, what should I do?

    Always replace burned-out fuses with ones of the same amperage (printed on the fuse) and note that if a fuse continues to “blow,” you should have the circuit checked professionally by one of our technicians for defects.