O'Fallon Auto Repair

Winter in Missouri can be unpredictable, with temperatures swinging from freezing to a surprisingly mild 50°F within a short time. For drivers, this fluctuation raises an important question: How should these changes in temperature affect tire air pressure? Recently, one of our employee’s mothers reached out with just this concern, unsure whether to add more air or reduce it, given Missouri's ever-changing weather patterns. It’s a great question, and one that we’re happy to answer for all drivers who want to keep their vehicles running smoothly throughout the winter months. Let’s dive into the science behind tire inflation, bust a few myths, and talk about how to keep your tires in tip-top shape through the colder season. How Tire Air Pressure Works Your vehicle’s tires are more than just rubber—they’re critical to your safety and vehicle performance. Proper tire inflation ensures that your tires maintain optimal cont ... read more

When it comes to maintaining your vehicle’s braking system, one of the most common questions that comes up is whether you should replace or resurface (also known as "turn") your brake rotors. Traditionally, resurfacing was the go-to solution for worn rotors, but in recent years, the automotive industry has shifted towards recommending rotor replacement over turning. This shift isn’t just a trend; it’s a necessary adaptation to changes in rotor design, material quality, and overall vehicle safety. At Hillside Auto Repair, we understand the intricacies of modern brake systems. Our ASE-certified technicians have seen firsthand how the expectations around brake maintenance have evolved, and we want to share why rotor replacement is often the safer and more effective option. Whether you're dealing with excessive brake noise, vibration, or just looking for routine maintenance, it’s important to understand how much things have changed in the automotive w ... read more

When you turn the key (or press the button) in your car and hear that familiar “vroom,” you're activating a complex system that includes the engine, the battery, and the starter. While the engine gets most of the attention, the starter is a crucial part of your vehicle’s ability to get up and running. Whether you're driving an older model or a newer one, understanding how your vehicle’s starter works—and how to take care of it—can save you time, stress, and potentially costly repairs down the road. What is a Starter in a Vehicle? In the simplest terms, the starter is an electric motor that cranks the engine to get it running. It’s activated when you turn your key or press your ignition button, providing the initial power to start the engine. Without a starter, your vehicle would be unable to begin its operation, leaving you stranded and unable to drive. The starter motor engages with the engine’s flywheel (a la ... read more

As the temperature drops and winter settles in, it’s a common sight to see drivers start their cars and let them idle for several minutes before driving off. It’s almost instinctual for many of us—especially those who have been driving for years—to believe that warming up the engine is a necessary part of preparing our vehicles for the cold weather. However, the question arises: is this really necessary anymore, or is it an outdated habit? At Hillside Auto Repair, we’re here to shed light on the facts, dispel any misconceptions, and provide accurate information to help you make informed decisions about your car’s winter care. Why Was Warming Up the Car Important for Older Vehicles? In the past, warming up your car in winter was more than just a comfort thing—it was actually a necessity for older vehicles. Let’s take a step back in time to understand why this practice was so prevalent. Carburetors and Cold Weath ... read more

When it comes to your vehicle's engine, efficiency and emissions control are two key aspects that work hand in hand. One unsung hero in this equation is the EGR valve, or Exhaust Gas Recirculation valve. While small, this component plays a big role in ensuring your engine runs smoothly while reducing harmful emissions. Let’s dive into what the EGR valve does, the common issues it faces, and how to spot symptoms of a blockage. And if you're dealing with EGR troubles, don’t worry—Hillside Auto Repair is here to help! What Does an EGR Valve Do? The EGR valve is part of your vehicle's emission control system. Its main job is to recirculate a portion of the exhaust gases back into the engine's combustion chambers. By doing this, the EGR valve helps reduce nitrogen oxide (NOx) emissions, which are harmful pollutants that contribute to smog and air quality issues. Here’s how it works: During combustion, the engin ... read more