The Ultimate Summer Vehicle Checklist: Keep Your Transmission Cool and Reliable

When summer hits, your vehicle faces more than just long road trips and traffic jams. Rising temperatures can push your transmission, and your entire vehicle, to the limit. At AAMCO, we understand how crucial a well-maintained transmission is for overall vehicle performance and that’s why we’ve created this expert-backed checklist to help you keep your car running cool, smooth, and reliable all season long. Take a look…

1. Check and Maintain Transmission Fluid

Why it matters: Transmission fluid lubricates, cools, and powers vital components. In high heat, old or contaminated fluid can break down quickly, leading to costly failures.

What to do:

• Inspect fluid level and condition; dark or burnt-smelling fluid needs immediate attention.

• Follow factory recommended service intervals (typically 30,000--60,000 miles) but adjust based on summer demands.

• Ask your AAMCO technician if synthetic fluid, formulated for heat resistance, is right for your car.

2. Service Your Cooling System

Why it matters: Your transmission relies on the same cooling system that protects your engine. Overheating is a leading cause of transmission issues.

What to do:

• Top off coolant with the correct antifreeze-to-water ratio.

• Inspect the radiator, hoses, and thermostat for damage or wear.

• Upgrade or install a dedicated transmission cooler for towing or mountain driving.

3. Monitor Tire Pressure and Condition

Why it matters: Underinflated or worn tires strain your drivetrain, reducing fuel efficiency and stressing the transmission.

What to do:

• Check tire pressure monthly, including the spare, and match manufacturer specs.

• Inspect for tread wear, sidewall cracks, and rotate every 5,000--8,000 miles.

4. Inspect the Brake System

Why it matters: Efficient braking reduces strain on your transmission, especially during stop-and-go traffic or steep descents.

What to do:

• Examine brake pads and rotors.

• Replace old brake fluid to maintain performance.

• Have your ABS and brake lines inspected by a professional.

5. Ensure Air Conditioning Efficiency

Why it matters: A functioning AC system keeps you comfortable and reduces engine load, indirectly protecting your transmission.

What to do:

• Test and recharge your AC system.

• Replace cabin air filters for better airflow.

• Inspect belts and pulleys for wear.

6. Test Your Battery and Electrical System

Why it matters: Heat degrades battery components and affects voltage sent to transmission control modules, which can cause erratic shifting.

What to do:

• Test battery strength and inspect terminals for corrosion.

• Ensure the alternator charges effectively.

7. Inspect Belts and Hoses

Why it matters: Worn belts or hoses can lead to overheating, impacting both engine and transmission health.

What to do:

• Look for cracks, fraying, or brittleness.

• Replace any suspect components before they fail.

8. Run a Transmission Diagnostic Scan

Why it matters: Modern transmissions are electronically controlled. A diagnostic scan can catch early issues before they escalate.

What to do:

• Visit your local AAMCO for a complimentary diagnostic scan.

• Watch for signs like slipping, hesitation, or unusual noises.

9. Adapt Your Driving for Summer Conditions

Why it matters: Towing, hill driving, and traffic require transmission adjustments to avoid overheating and wear.

What to do:

• Follow your owner's manual for towing guidelines.

• Use engine braking on descents and give your vehicle time to cool in extreme heat. 

10. Schedule a Professional Inspection

Why it matters: Preventive care is the best way to ensure summer-ready performance.

What to do:

• Book a complete vehicle checkup at your local AAMCO.

• Ask about transmission fluid service, cooling upgrades, and towing prep.

Confidence in Every Mile

With the right maintenance and expert support from AAMCO, your summer driving experience can be worry-free. Stay safe, stay cool, and keep your transmission road-ready for every adventure.