It is recommended to inspect the $AC$ system and check freon levels once a year (in spring, before the summer season). Even in fully sealed systems, a natural annual freon loss of 5% to 10% is considered normal.

Wheel balancing ensures even wheel rotation. Unbalanced tires cause steering wheel and chassis vibration at high speeds (80 to 100 km/h), accelerate suspension wear (wheel bearings, shock absorbers), and lead to uneven tire tread wear.