Driving in summer can feel like a sauna if your car’s cooling system isn’t up to the task. Luckily, a few routine checks and small habits can stop overheating before it starts. Below are the most useful tips you can apply today, whether you’re a daily commuter or a weekend road‑tripper.
First, keep an eye on the coolant level. Open the radiator cap only when the engine is cold, then top up with the correct mix of water and antifreeze. A low level is the number‑one cause of heat problems.
Next, inspect the radiator hoses for cracks or bulges. Replace any hose that looks worn – a bad hose can let hot coolant escape and turn your engine into a steam kettle.
Make sure the radiator fan is working. Turn the key to the "on" position (engine off) and watch the fan. If it doesn’t spin, your fan relay or motor may need attention.
Flush the cooling system every two years or according to the manufacturer’s schedule. Old coolant can become acidic and corrode the radiator, reducing its ability to shed heat.
Don’t ignore the thermostat. A stuck‑closed thermostat traps heat inside the engine. If the temperature gauge shoots up quickly after a short drive, replace the thermostat.
The cabin can get sweltering even if the engine stays cool. Start by using a reflective sunshade on the windshield when you park. It cuts interior temperature by up to 30°F.
Crack the windows a few inches if you can’t shade the car. That tiny opening lets hot air escape and prevents the greenhouse effect.
Check the HVAC cabin filter. A clogged filter reduces airflow, making the AC work harder and waste energy. Swap it out every 12‑15 000 miles.
When you first start the car, run the AC on the highest fan setting for a minute before setting it to your desired temperature. This pushes the refrigerant through the system and speeds up cooling.
If you own a newer model with a "recirculate" button, use it after the car is cool. Recirculating already‑cooled air is more efficient than pulling hot outside air.
Finally, keep the engine bay clean. Dirt on the radiator fins acts like a blanket, trapping heat. Use a soft brush and low‑pressure water to clear debris, then spray a radiator cleaning spray for stubborn grime.
By doing these quick checks each month, you’ll avoid costly repairs and stay comfortable even on the hottest days. A well‑maintained cooling system is cheap insurance against heat‑related breakdowns.
Remember, prevention is easier than fixing an overheated engine on the side of the road. Set a reminder in your phone to check coolant and fan operation at least once a season, and enjoy a cool ride all year long.