The Blend door actuator is a really vital part of your A/C heater system., and it costs a small fortune to replace, especially considering the part only costs a measly 30 bucks or so, but the labor is about a 1000.00 because they have to completely dismantle the dash, something I was not willing to do. So, I make do with what I have., I get enough cool air from the defroster ducts and have to live with that. But honestly, never in all the previous 6 Marquis I've owned has this ever happened and I think it's disgusting. No wonder everyone buys crappy Chinese cars!