Hi First time poster on the site. I'll cut right to the chase. My condo was built in 2005. It was never lived in until 2013, when we bought it. I wasn't great about changing the air filter - changed 5-6 times in 7 years. A couple days ago, we realized the AC was running 24 hours per day without cooling the house at all. I watched some YouTube videos and asked a friend with some knowledge, and I was led to believe the evaporator coils were probably dirty. It has taken me two days of painstaking step by step work, but I now have access to the Evaporator Coils (top side only). I can't figure out how to take off this Triangular Access Panel. Some pictures are attached. Is the triangular metal attached to anything internally? It doesn't seem to want to come out. Could it be rusted in place? Or does the metal fold inside and attach elsewhere? Step One: Notice the ice inside Step two: I finally got the door out of the way, revealing evaporator coils (top side only) I can't get the triangle out - it seems to be either rusted in at the bottom or otherwise attached internally. Note - can that white drain pipe be unscrewed? i wonder if maybe it's blocked (although i poured some water in and it drains fine) I shine my flashlight inside, and it doesn't seem particularly dirty (like i've seen in YouTube videos), leading me to wonder whether this is even the correct diagnosis after all? Thanks in advance .

Have luxaire not cooling properly. Cleaned outside coil. Inside coil never cleaned over 20 years. Doesn’t look too bad from a distance. Can only access by removing motor and going through the bottom. Have to reach up like 3 feet. Could I spray foam from bottom and rinse with hose? Will be messy but I’m desperate.