How Hot Weather Can Affect Your Vehicle
Summer heat can be hard on more than just drivers and passengers. High temperatures can place added stress on your vehicle’s battery, tires, fluids, air-conditioning system, and engine.
Understanding how hot weather affects your vehicle can help you avoid unexpected repairs, improve performance, and stay safer on the road.
1. Heat Can Weaken Your Vehicle’s Battery
Many drivers associate battery problems with cold Vermont winters, but hot weather can be just as damaging.
High temperatures can cause battery fluid to evaporate faster and accelerate corrosion inside the battery. Over time, this can reduce battery life and leave you with a vehicle that struggles to start.
Signs of a weak battery may include:
- Slow engine cranking
- Dim headlights
- Electrical issues
- A battery warning light
- Clicking when you try to start the vehicle
Having your battery tested before a long summer trip can help prevent an inconvenient breakdown.
2. Hot Pavement Can Affect Your Tires
As temperatures rise, the air inside your tires expands. This can increase tire pressure and place additional stress on tires that are worn, damaged, or improperly inflated.
Hot pavement can also increase the risk of a tire failure, especially during extended highway driving.
Check your tire pressure when the tires are cool and follow the recommended pressure listed inside the driver’s door jamb. Do not rely only on the maximum pressure printed on the tire itself.
You should also inspect your tires for:
- Cracks
- Bulges
- Uneven wear
- Low tread depth
- Objects embedded in the tire
Properly maintained tires can improve traction, fuel economy, ride comfort, and safety.
3. Your Engine Can Be More Likely to Overheat
Your vehicle’s cooling system works harder during hot weather. Low coolant, a damaged hose, a worn belt, a malfunctioning thermostat, or a failing radiator can all increase the risk of overheating.
Keep an eye on your temperature gauge while driving. If the gauge moves toward the red zone or you see steam coming from under the hood, safely pull over and turn off the engine.
Never remove a radiator cap while the engine is hot. The cooling system may be under pressure, and hot coolant can cause serious burns.
Regular cooling-system inspections can help identify leaks or worn components before they cause a larger problem.
4. Hot Weather Can Reduce Air-Conditioning Performance
Your air-conditioning system has to work especially hard during the hottest days of summer.
If the air coming from your vents is not as cold as it used to be, the system may have low refrigerant, a leak, a clogged cabin air filter, or another mechanical issue.
A properly operating air-conditioning system does more than keep you comfortable. It can also help reduce driver fatigue and improve visibility by controlling moisture inside the vehicle.
5. Heat Can Break Down Vehicle Fluids
Extreme heat can cause vehicle fluids to deteriorate more quickly. Engine oil, transmission fluid, brake fluid, coolant, and power-steering fluid all play an important role in protecting major vehicle components.
Low or contaminated fluids can lead to increased friction, overheating, reduced performance, and expensive repairs.
Before summer travel, consider having your vehicle’s fluids checked and replaced according to the manufacturer’s recommended maintenance schedule.
6. Heat Can Damage Your Vehicle’s Interior
Direct sunlight can cause the temperature inside a parked vehicle to rise quickly. Over time, ultraviolet rays and excessive heat can fade upholstery, dry out leather, damage dashboards, and affect electronic components.
You can help protect your vehicle’s interior by:
- Parking in the shade when possible
- Using a windshield sunshade
- Applying UV-protective interior products
- Keeping leather surfaces properly conditioned
- Avoiding leaving electronics in direct sunlight
Never leave children or pets unattended inside a parked vehicle, even for a short period of time.
7. Hot Weather Can Lower Fuel Economy
Running the air conditioner, driving with underinflated tires, carrying extra weight, and sitting in traffic can all reduce fuel economy.
You may be able to improve summer fuel efficiency by keeping your tires properly inflated, removing unnecessary cargo, staying current with maintenance, and avoiding aggressive acceleration.
Summer Vehicle Maintenance Checklist
Before your next road trip, make sure you check:
- Battery condition
- Tire pressure and tread
- Engine coolant level
- Engine oil
- Air-conditioning performance
- Windshield wipers
- Belts and hoses
- Brake condition
- Exterior and interior lights
Schedule Summer Vehicle Service in St. Johnsbury, Vermont
A seasonal inspection can help make sure your vehicle is ready for hot weather, long drives, and summer travel.
The service team at St. Johnsbury GMC can inspect your battery, tires, cooling system, fluids, brakes, air conditioning, and other important components.
Schedule your service appointment today and enjoy greater confidence wherever the road takes you this summer.
Frequently Asked Questions
Can hot weather cause a car battery to die?
Yes. High temperatures can speed up battery fluid evaporation and internal corrosion, which may shorten the life of the battery.
Should tire pressure be higher during hot weather?
Tire pressure naturally increases as temperatures rise. Always check pressure when the tires are cool and use the vehicle manufacturer’s recommended tire pressure.
What should I do if my vehicle starts overheating?
Safely pull over, turn off the engine, and allow the vehicle to cool. Do not remove the radiator cap while the engine is hot. Contact roadside assistance or a qualified service department if necessary.
How often should vehicle fluids be checked?
Fluid levels should be checked regularly and replaced according to the maintenance schedule listed in your owner’s manual.
Why is my air conditioner not blowing cold air?
Possible causes include low refrigerant, a refrigerant leak, a clogged cabin air filter, compressor problems, or electrical issues. A professional inspection can help identify the cause.
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