This is a rental home and I have and I'm stumped. AC wasn't blowing cold so I thought. It didn't relate tested it I could feel the air was actually blowing cold unfortunately was barely trickling out of the vents. Check the blower motor doesn't seem to be a problem. Check the intake air filter no problem. Even when I completely remove the filter and let it flow freely it does not improve the flow. However, when I open the access panel and allow air to Simply bypass the evaporator coils, it was like a hurricane. So I have determined that the choke point could be nothing other than the evaporator coils themselves. I sprayed coil cleaner all over them and use the scrub brush even when it's them and it did not help at all. I poured some vinegar on to them and that did not help either. They are NOT iced over that is not the problem. Has anyone heard of something like this? The unit is very old like 25 years. It needs to be replaced but this is a home I'm going to sell I just wanted to be cool for showings. Is it possible for evaporator coils to Simply corrode and block airflow? Anyone seen something like this? Wondering if I should try CLR or something. ?