Is there a break in period on new auto ac units?

Yes, most new auto air conditioning systems have a break-in period of around 100 hours before they reach peak performance. During this break-in period, the system may be less efficient and may not cool as well as it could. This is because the new parts in the system need time to wear in and settle down. In some cases, the system may make some strange noises during the break-in period, but this is normal. Once the break-in period is complete, the system should work properly and efficiently.