O'Fallon Auto Repair

As summer temperatures rise, a functioning air conditioning (A/C) system in your car becomes crucial for comfort and safety. When your A/C starts blowing warm air, the natural inclination might be to simply add more Freon (refrigerant) to the system. However, this approach is often misguided and can lead to more significant problems down the road. Proper diagnosis and professional repair are essential for ensuring your car's A/C operates efficiently. At Hillside Auto Repair, we understand the intricacies of automotive A/C systems and are committed to providing top-notch maintenance and repair services backed by a 3-year/36,000-mile warranty on parts and labor. The Misconception: Just Add More Freon Freon, or refrigerant, is a critical component of your car's A/C system. It absorbs heat from the cabin and releases it outside, thus cooling the interior. When the A/C isn't working properly, it might seem like a low refrigerant level is the culprit. While thi ... read more

As responsible vehicle owners, staying attuned to the health of our cars is paramount. Among the critical components that demand our attention, the timing belt stands as a silent sentinel, orchestrating the synchronized movements of the engine's internal components. However, with time and wear, this essential part can deteriorate, potentially leading to catastrophic engine failure if not replaced promptly. In this comprehensive guide, we explore the warning signs of an aging timing belt, emphasizing the importance of proactive maintenance to avoid costly repairs and downtime. Understanding the Timing Belt's Role The timing belt, often overshadowed by more conspicuous parts like engines and brakes, plays a pivotal role in ensuring the smooth operation of your vehicle's engine. It synchronizes the rotation of the camshaft and crankshaft, ensuring that valves open and close at precisely the right times, coordinating with the pistons. This precise timing is c ... read more

Headlight bulbs are the unsung heroes of road safety, providing essential illumination during nighttime driving and adverse weather conditions. With advancements in automotive technology, consumers now have a variety of options to choose from, including traditional halogen bulbs, high-intensity discharge (HID) bulbs, and light-emitting diode (LED) bulbs. In this comprehensive guide, we'll delve into the nuances of each type to help you make an informed decision about which headlight bulbs are best suited for your vehicle. Halogen Headlight Bulbs: Halogen bulbs have been the standard choice for automotive lighting for decades, prized for their affordability and reliability. They operate by passing electricity through a tungsten filament encased in a halogen gas-filled quartz capsule, producing a bright, white light. While halogen bulbs are cost-effective and easy to replace, they have some drawbacks compared to newer technologies. They tend to have a shorter lifesp ... read more

  When it comes to maintaining your vehicle, some components are more well-known than others. While most car owners are familiar with the essentials like the engine, transmission, and brakes, there are smaller, equally crucial parts that often go unnoticed—until they cause a problem. One such component is the charcoal canister, a vital part of your vehicle's evaporative emission control system (EVAP). Understanding its function and importance can help you avoid costly repairs and keep your vehicle running smoothly. Moreover, it’s essential to know why you should never top off your fuel tank when refilling. What is a Charcoal Canister? The charcoal canister is a key component in your car's evaporative emission control system. It is designed to capture and store fuel vapors that are emitted from your fuel tank. These vapors are then redirected back into the engine to be burned during combustion, reducing the overall emissions of your vehicle ... read more

As the scorching summer sun beats down on Missouri, ensuring your vehicle's air conditioning system is functioning correctly becomes a top priority. One key component that often goes unnoticed but plays a vital role in maintaining a comfortable cabin temperature is the blend door actuator. This small yet significant part of your car's HVAC (Heating, Ventilation, and Air Conditioning) system can make the difference between a pleasant drive and an unbearably hot journey. Understanding what a blend door actuator does, recognizing the symptoms of a malfunction, and knowing when to seek professional help are essential for any vehicle owner. What is a Blend Door Actuator? A blend door actuator is a motorized device that controls the flow and temperature of air entering your car's cabin. It operates the blend door, which regulates the mix of hot and cold air from your vehicle’s heater core and air conditioner. By adjusting this mix, the actuator ensures th ... read more