You got to understand that Dealership Prices are often overpriced, literally 9 out of 10 times the dealership is basically stealing your money.. There is nothing special about their process to replace the air cabin, they ask for that much money because YOU the owner do not know how to do it yourself so you are paying for the knowledge and the piece of mind. They also have to pay the "pseudo-Certified" mechanics by the hour rate and California has one of the most expensive hour rate charges in the country.. So that is basically why it cost so much.
I sincerely haven't paid for these kind of services in my entire adult life, I learn how to mess with cars in my teens so I havenīt had a budget for anything car labor related for more than a decade, if there is a budget its for parts only. Having a garage well equipped saves you lots of money in the long run.
I agree that the basic maintenance services are typically overpriced, and that those services are good money makers for dealers. However, I wouldn't go as far as saying that the dealership is "stealing" your money. The dealers set their prices, and vehicle owners are free to choose to have their service done there or somewhere else. I'm not exactly sure what percentage the techs get from the dealer's hourly rates (my best guess is between 20-35% depending on skill level), but it's obviously not 100%. With the dealer rates, you are paying for other "services". This probably includes: a clean, modern, and upscale facility with a nicely furnished waiting area; training for techs; the service advisor/writer, manager, and other support staff; loaner vehicles; car wash and vacuum; snacks, drinks, and the coffee machine; and the giant flat panel TV, cable service, and Wi-Fi. Some vehicle owners like these kinds of things, so they'll pony up and pay the premium. Aside from the loaner vehicle, I personally don't value those things as much when I need to have basic maintenance done. But if I have something like an odd problem or intermittent issue on a relatively new vehicle that needs to be addressed, I'm willing to pay the dealer's prices.
Now if the dealership is charging for services that don't get done or pushing work that isn't definitely not needed or called for by the manufacturer, then yes, I'd agree that they're stealing from the customer. This is part of what defines the word "stealership".