I'm hoping some of our air conditioner knowledgeable members can help me out. I just had my AC maintenanced. I haven't had it maintenanced in three years. He says my coil is completely impacted and it will cost around $400 to remove it and clean it. He also said not to run my AC until he cleans it (appointment tomorrow) because there's a really good chance my AC will freeze up. Does this sound like he's providing me with correct information?