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Summer in Indianapolis is something we all look forward to, especially after our long, grey winters. Whether you’re heading up to Morse Reservoir for a day on the water or planning a road trip down to Brown County, the last thing you want is your car giving up on you when the thermometer starts climbing into the high 80s and 90s.

At Indy Auto Repairs, we see a lot of the same preventable issues every year. The transition from spring to summer puts a unique kind of stress on your vehicle. While winter is known for its “no-start” mornings, summer is the season of the “unexpected breakdown” on the side of I-465. To help you keep your summer plans on track, we’ve put together a list of the seven most common summer auto repair mistakes we see Indianapolis drivers make: and how you can avoid them.

1. Waiting Until the AC Fails During a Heat Wave

We’ve all been there. You notice the air coming out of your vents isn’t quite as icy as it used to be, but it’s “good enough” for a short drive to the grocery store. Then, the first real Indiana humidity spike hits, and suddenly you’re driving in a mobile sauna.

One of the biggest mistakes you can make is ignoring those early warning signs. If your vents are blowing lukewarm air or you notice a strange squealing sound when you turn the air on, your system is likely struggling. Often, it just needs a simple refrigerant recharge or a new cabin air filter. However, if you force a struggling system to work overtime during a heat wave, you risk burning out the compressor entirely.

If your car A/C is not blowing cold, it’s much better to have it looked at in June than to be stuck in a hot car in late July. A quick inspection can determine if you have a minor leak or if a component is nearing the end of its life, saving you from a much more expensive repair down the road.

2. Neglecting Tire Pressure and Tread Depth

The pavement in Indianapolis gets incredibly hot during the summer. If you’ve ever walked across a parking lot in July, you know exactly what we mean. That heat is transferred directly to your tires, and it causes the air inside them to expand.

Many drivers forget that tire pressure changes with the temperature. For every 10-degree rise in temperature, your tire pressure can increase by about one pound per square inch (PSI). If your tires were already on the edge of being overinflated, or if the rubber is old and brittle, that extra pressure combined with hot asphalt can lead to a dangerous blowout.

Conversely, driving on underinflated tires in the summer causes the sidewalls to flex more, creating even more heat. It’s a recipe for disaster. Before you head out on your next weekend getaway, take five minutes to check your tire pressure and look for any signs of uneven wear. If it’s been a while since your last service, you might want to find out how often you should get your car’s tires rotated to ensure they wear evenly and last as long as possible.

3. Skipping a Professional Coolant Flush

Your engine’s cooling system is its only defense against the brutal summer heat. The coolant (or antifreeze) in your car doesn’t just prevent freezing in the winter; it also raises the boiling point of the water in your radiator and protects your engine from corrosion.

Over time, coolant breaks down and loses its effectiveness. It can become acidic, which eventually eats away at your radiator, water pump, and hoses from the inside out. A common mistake we see is drivers simply topping off their coolant with water or a different type of antifreeze. While this might get you home in an emergency, it dilutes the protective properties of the fluid.

If you haven’t had your cooling system flushed in the last two or three years, you’re playing a risky game. Understanding what to do if your car overheats in Indianapolis is important, but preventing that overheat in the first place with a professional flush is much better for your engine: and your wallet.

4. Forgetting That Heat Kills Batteries Faster Than Cold

Most people associate battery trouble with the dead of winter. It’s true that cold weather makes it harder for a battery to start an engine, but it’s actually the summer heat that does the most damage.

High temperatures cause the liquid inside your battery to evaporate more quickly. Heat also speeds up the internal chemical reactions that lead to corrosion and permanent damage. You might not notice the damage during the summer because the engine is easier to turn over when it’s warm, but as soon as that first crisp fall morning arrives, a heat-damaged battery will likely fail.

Keep an eye out for car battery replacement warning signs, such as a slow crank when starting or corrosion (that white, powdery stuff) on the battery terminals. If your battery is more than three years old, it’s a good idea to have it tested before the peak of summer hits.

5. Overlooking Basic Fluid Checks and Top-Ups

Your car relies on several different fluids to stay cool, lubricated, and safe. In the summer, these fluids can evaporate or break down faster than usual. Beyond just engine oil and coolant, you need to think about your brake fluid, transmission fluid, and even your windshield washer fluid.

Summer in the Midwest often brings sudden, heavy downpours. If your washer fluid is empty and your wipers are streaking, those “pop-up” thunderstorms can become incredibly dangerous very quickly. Furthermore, low transmission fluid can cause your car to shift poorly or overheat when you’re stuck in stop-and-go traffic on the Northside.

We can’t stress enough the importance of regular car fluid checks and top-ups. It’s one of the simplest things you can do to keep your car running smoothly, yet it’s one of the most frequently skipped maintenance tasks.

6. Ignoring the Check Engine Light

It’s tempting to ignore a glowing orange light on your dashboard when the car seems to be running “just fine.” However, that light is often the first sign of an issue that will only get worse with the added stress of summer driving.

In many cases, a check engine light in the summer is related to your car’s evaporative emission (EVAP) system. This system is designed to trap gasoline vapors before they escape into the atmosphere. As temperatures rise, fuel evaporates more easily, putting more pressure on the EVAP system. A small leak might trigger the light now, but ignoring it could lead to poor fuel economy or even a failed emissions test.

If your light is on, don’t wait for a breakdown. Take a look at these 10 reasons your check engine light is on to see why it’s worth getting a local guide to engine diagnostics here in Indianapolis.

7. Skipping the Pre-Trip Inspection

The most expensive mistake any driver can make is skipping a professional inspection before a long summer road trip. When you’re driving for five or six hours straight at highway speeds in 90-degree weather, any minor weakness in your vehicle will be exposed.

A “knowledgeable neighbor” tip: just because your car drives fine to and from work every day doesn’t mean it’s ready for a 500-mile trip. Routine commutes don’t stress the cooling system or the tires nearly as much as a high-speed interstate run does. A pre-trip inspection at a trusted shop can catch things like a fraying belt, a bulging tire sidewall, or a tiny coolant leak that could have left you stranded hours from home.

Investing in a little bit of preventive care is the best way to ensure your summer memories are about the destination, not the tow truck ride. Keeping your ride smooth is all about staying ahead of the maintenance schedule.

Enjoy a Stress-Free Indianapolis Summer

At Indy Auto Repairs, we want you to enjoy every bit of the Indiana summer. Our team has been serving the Indianapolis community for nearly three decades, and we take pride in helping our neighbors stay safe on the road. Whether you need a quick A/C check, a battery test, or a full seasonal inspection, we’re here to help with transparent pricing and friendly service.

Don’t let a preventable mistake ruin your summer plans. Give us a call or book an appointment online today, and let’s make sure your vehicle is as ready for the heat as you are.