O'Fallon Auto Repair

As summer approaches, there’s nothing worse than turning on your car’s air conditioning only to be greeted by warm, stale air. A properly functioning A/C system isn’t just about comfort—it’s about safety, fuel efficiency, and preserving your vehicle’s longevity. In this in-depth guide, we’ll break down everything you need to know about automotive A/C service, including the differences between R-134a and R-1234yf refrigerants, why certified professionals should handle your A/C repairs, and how Hillside Auto Repair can keep you cool all season long—backed by a nationwide 3-year/36,000-mile warranty on parts and labor. Why A/C Service Matters Your car’s air conditioning system is more complex than most drivers realize. It’s not just about refrigerant—it’s a network of components including the compressor, condenser, evaporator, expansion valve, and seals, all working in harmony. Over time, refrigeran ... read more

Your vehicle’s fuel pump is a centerpoint of your engine’s performance, quietly delivering the precise amount of fuel needed for combustion. When it fails, your car’s reliability—and your peace of mind—can take a serious hit. Understanding how fuel pumps work, recognizing early warning signs of failure, and knowing when to seek professional repair can save you from costly breakdowns and keep your vehicle running at peak efficiency. What Is a Fuel Pump? The fuel pump is a critical component of your vehicle’s fuel delivery system, responsible for transferring gasoline from the tank to the engine at the correct pressure. Most modern vehicles use electric fuel pumps, which are typically mounted inside the fuel tank (submerged in fuel for cooling and lubrication). Older vehicles may have mechanical fuel pumps driven by the engine’s camshaft. A properly functioning fuel pump ensures: - Consistent fuel pressure for optimal combus ... read more

When it comes to vehicle maintenance, some services are non-negotiable—oil changes, tire rotations, and brake inspections are at the top of the list. But what about brake fluid flushes? Many drivers overlook this critical service, assuming that if their brakes are working, the fluid must be fine. However, neglecting your brake fluid can lead to costly repairs—or worse, brake failure. In this post, we’ll dive into why brake fluid is so important, how it works, and why it needs to withstand extreme temperatures. We’ll also discuss the warning signs of contaminated or degraded fluid and why Hillside Auto Repair trusts BG Brake Fluid for superior performance. Plus, we offer a nationwide 3-year/36,000-mile warranty on parts and labor for all services—because your peace of mind matters as much as your safety. What Does Brake Fluid Actually Do? Brake fluid is the lifeblood of your braking system. Unlike engine oil or coolant, it doesn&rsquo ... read more

As an automotive shop, we've heard it all when it comes to parking brakes (also known as emergency brakes or e-brakes). Some drivers swear by them, while others forget they even exist—until the day they really need them and find out they’re stuck. If you’re part of the “I never use my parking brake” club, listen up: ignoring it can lead to costly repairs and even safety risks. Let’s dive into why you should use your parking brake regularly, common issues that arise from neglect, and how to keep it in top shape. Why You Should Use Your Parking Brake—Even on Flat Ground Many drivers assume the parking brake is only for steep hills or emergencies. But here’s the truth: your parking brake is designed to be used every time you park—whether you’re on an incline or a perfectly level driveway. Here’s why: Prevents Transmission Strain (Automatics Too!)– When you park, your car’s weight rests ... read more

As automotive enthusiasts, we often focus on the flashy parts of our vehicles—the turbochargers, the exhaust notes, the horsepower figures. But some of the most critical components are the unsung heroes working behind the scenes. One such part is the charcoal canister, a small but vital piece of your car's emissions system. Today, we’re diving into what a charcoal canister does, why you should never"top off" your fuel tank at the pump, and how to tell if yours is failing. Plus, if you suspect an issue, Hillside Auto Repair can diagnose it—and with our nationwide 3-year/36,000-mile warranty on parts and labor, you can rest easy knowing your ride is in good hands. What Is a Charcoal Canister? The charcoal canister (officially known as the EVAP canister) is a key part of your vehicle’s Evaporative Emission Control System (EVAP). Its job? To prevent harmful fuel vapors from escaping into the atmosphere. Here’s how it works ... read more