Daryush

I have a very odd problem with my AC. My car is a 2015 GLE 450 AMG, it is my 3rd car that I normally tow a boat with. When I use the car regularly AC does not work and blows hot air, if it is not used for 2-3 days AC works for 5 mins after the engine start and then hot air kicks in. OBDI scanner shows no error related to AC. However I get 2 errors: B1F4500: The starter batter has excessive resistance, and B21059A: The capacity of starter battery is too low. I am not sure if these errors are related to AC problem, took the car to an auto electrician, he checked the starter battery and said it is very healthy, around 80% crank power and alternator is working well. He said it could be an old auxiliary battery, as it was only $28, I bought one and replaced it myself. No change. I hooked up the battery to a beefy charger and left it to be charged fully for 24 hours. It came up good passing all the test on battery tester. However both errors remain there. I have reseated all connections on front SAM, checked all fuses and relays, no luck. The only thing impacted is AC. Any clues champs?

Daryush

Anyone?