Summer heat doesn’t just affect you—it puts extra strain on your vehicle, especially under the hood. From long road trips to bumper-to-bumper traffic, high temperatures can push your engine and automotive fluids to their limits. That’s why checking and upgrading your essential fluids is essential for a smooth, stress-free drive.
Here’s your go-to guide for the best coolants and fluids for summer driving, brought to you by Kunes Chevrolet GMC of Lake Geneva.
Best Coolant for Summer: What You Should Know About Boiling Point
Engine coolant—also known as antifreeze—is your car’s first line of defense against overheating. The boiling point of antifreeze raises the boiling point of coolant to prevent overheating in summer. While antifreeze protects against freezing in winter, the right high-temperature engine coolant is crucial for your car's engine performance during summer heat.
Top Picks for 2025 Coolants:
- Prestone Extended Life 50/50: Great all-season option with added corrosion protection.
- Zerex G-05 Phosphate Free: Excellent for European and Asian vehicles in hot climates.
- Peak Long Life Full Strength: Synthetic formula designed for longer change intervals.
- OEM-Specific Coolants: Always check your owner’s manual or ask your Kunes technician for brand-specific recommendations.
Coolant vs. Antifreeze: What’s the Difference?
Though often used interchangeably, here’s the quick breakdown:
- Antifreeze is the concentrate (usually ethylene glycol).
- Coolant is a mix of antifreeze and water (usually 50/50).
Maintaining the correct coolant mix is crucial to prevent overheating and engine damage, especially during hot summer months.
You need coolant in summer—not just antifreeze—to regulate engine temperature and prevent boilover.
Radiator Fluid for Summer: Why It Matters
Best radiator fluid options are designed to handle high-pressure, high-temperature conditions. Proper maintenance of your coolant system, including a good radiator flush and refill before summer, removes old coolant, rust, and contaminants—protecting your system from corrosion and overheating.
Ask Kunes Chevrolet GMC of Lake Geneva for a full inspection, flush, and refill with premium fluid.
Car Fluids to Check in Summer: Your Essential Coolant Reservoir Checklist
Summer heat affects more than just your coolant. Maintaining your car's fluids is crucial for optimal vehicle performance, particularly during the summer season. Here’s your car fluid checklist for summer:
| Fluid | Why It Matters in Summer |
| Coolant | Prevents overheating |
| Motor Oil | Choose synthetic for better heat resistance |
| Transmission Fluid | Keeps shifting smooth in high temps |
| Brake Fluid | High heat can reduce braking efficiency |
| Power Steering Fluid | Prevents steering issues during long drives |
| Windshield Washer Fluid | Opt for bug-fighting formulas for summer driving |
Regular car maintenance in hot weather can mean the difference between a great road trip and an unexpected breakdown. Additionally, performing a fluid flush for transmission and brake fluids is essential for maintaining optimal performance and safety.
Engine Oil for Summer Driving: Keep Your Engine Running Smoothly
Transmission and Brake Fluids: Ensuring Safety and Performance
Transmission fluid and brake fluid are critical for your vehicle’s safety and performance, especially in hot weather. Transmission fluid ensures smooth gear shifts and prevents transmission damage, while brake fluid transmits pressure to the brake pads, enabling effective braking. Both fluids can degrade over time, particularly in high temperatures, which can compromise their effectiveness.
Regularly check the levels and condition of your transmission and brake fluids to ensure they are in good shape. Top off these fluids as needed, and consider replacing them if they appear dirty or contaminated. Using high-quality fluids that meet or exceed your vehicle’s manufacturer specifications is essential for maintaining optimal performance. If you’re unsure about the condition or maintenance of these fluids, consult a professional mechanic to keep your vehicle running safely and efficiently.
Synthetic Coolant for Cars: Worth the Upgrade?
Synthetic coolant offers longer life, better thermal stability, and enhanced corrosion protection. It’s a great choice for newer vehicles or anyone planning long summer drives in extreme temperatures.
Prevent Engine Overheating with These Cooling System Tips
- Check coolant levels weekly during summer months.
- Inspect hoses and belts for cracks or leaks.
- Flush your cooling system every 2-3 years or as recommended.
- Check the coolant reservoir regularly to ensure it is at the proper level and to prevent engine overheating.
- Don’t ignore the temperature gauge—if it climbs, pull over and let the engine cool.
If your engine has ever run hot, it’s time to book a radiator and coolant check.
Safe Driving Tips for Hot Weather: Stay Cool on the Road
Driving in hot weather requires extra precautions to keep your vehicle and yourself safe. Before embarking on a long drive, always check your vehicle’s fluids, including coolant, engine oil, transmission fluid, and brake fluid. Ensuring your cooling system is functioning properly is vital to prevent overheating. Keep your windshield washer fluid reservoir topped up with a summer-specific formula to maintain clear visibility.
Regularly check your air filter and replace it if it’s dirty or clogged to improve fuel efficiency and performance. To reduce the risk of overheating and heat-related issues, avoid driving during the hottest part of the day. Keep an emergency kit in your vehicle, including items like a spare tire, jumper cables, and a first-aid kit. Stay hydrated and take regular breaks to avoid driver fatigue and heat exhaustion. By following these tips, you’ll stay cool and safe on the road during the hot summer months.
Get Your Car Summer-Ready with Kunes Chevrolet GMC of Lake Geneva
Our expert techs at Kunes Chevrolet GMC of Lake Geneva will:
- Check all your fluids
- Recommend the best engine coolant for hot weather
- Inspect for leaks, corrosion, or weak hoses
- Perform full coolant flush and refill services
Beat the Heat—Book Your Summer Fluid Flush Service Today
Whether you’re heading out on a road trip or just surviving the summer commute, make sure your vehicle is up to the task. Schedule your service today and drive with confidence all season long.
✅ Prevent engine overheating
✅ Maximize vehicle performance
✅ Use the best fluids for long summer drives
Regular maintenance checks and fluid changes are essential for keeping your vehicle running smoothly.
