A/C performance often declines gradually
Drivers may not notice weak cooling until the first hot week. Testing the system earlier gives the shop time to diagnose low charge, airflow and component problems.
Run the system throughout the year
The defrost setting may use the A/C system to remove moisture. Periodic operation also lets you notice changes in noise, smell and cooling behaviour.
Book when performance changes
If cooling takes longer, varies with road speed or stops on one side of the cabin, schedule an A/C inspection. Include those specific symptoms in the request.