If your German car's A/C takes 15 minutes to get cold, the system may be weak and struggling to remove heat from the cabin. A properly working A/C system should usually begin cooling within a few minutes. Slow cooling can be caused by low refrigerant due to a small leak, a weak or defective A/C compressor, a dirty or clogged condenser or evaporator, a cooling fan problem, a clogged cabin air filter, or a blend door not regulating the air temperature correctly.
Parking in direct, hot sun can also delay cooling. But if the A/C eventually cools but takes longer than before, the A/C technician at Stadium Auto Service can check pressures, vent temperature, airflow, and signs of refrigerant leaks to identify the cause of poor A/C cooling performance.