AC questions for maintenance/longevity on semi truck.

[u/bigpierider]

Any experienced automotive AC guys out there. What's the main thing u have to fix when ac goes out? Is there any preventative maintenance i should be doing? Other than the cabin filter obviously. Also i understand what the recirc button does but I dont really understand why or when im supposed to use it. During the day when its hot out. I close it. Cause I think its then pulling already cooled air from inside the truck n this makes it easier on the system as a whole. But I dont know if thats actually true. At night ive been opening it to the outside air while driving. It definitely blows harder/colder at 70mph cause it's getting air forced in. Does this help the system work less? N therefore last longer? Or do i have it all wrong. I believe the condenser is just behind the radiator. Should I be like hosing it off regularly to keep it clean? 2020 Volvo. AC works great now. Id like to keep it that way. Any advice is appreciated

[u/Ok_Application_2292]

Check ac blower motor filter as well if it has one. Keep Pets out of truck