Need Help: What is this part on my engine?

[Ronpurdue]

HI, recently I bought a 2019 Expedition limited ... but it's missing caps for some pipes ..what are these? Items in red box ...mine is missing these caps

 

[99WhiteC5Coupe]

HI, recently I bought a 2019 Expedition limited ... but it's missing caps for some pipes ..what are these? Items in red box ...mine is missing these caps

View attachment 79906

Air conditioning charging access ports. They caps should be installed to keep dirt from the fitting. High and low sides are different sizes.

 

[Bombtech59]

Those are used to refill the Air conditioning unit unsure how big a deal it is not to have them Look for schrader valve caps hope this helps

 

[Ronpurdue]

Thanks guys ...for help!