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It sounds like this might be a heat pump version and the reversing valve may be damaged? Can you give me the model number?
Let me check on this and get back to you..........
I show that a 49024-879 is a heat pump. A 49204-879 is a regular A/C. So, if you are correct, this may be just a matter that the ambient temps on the roof are so hot that it is affecting the cooling and the air coming out gets warmer. That is about the only explanation possible based on what you told me.
Doubtful that is the problem.........especially at that ambient temp. Hard to believe it is losing refrigerant with frost on the lines. You double checked that model number?
Did you check the air filter and coils above that?
O.K.........I have no other explanation. I will opt out and let another tech offer something if they have another idea.
Another tech can offer something if they can and it is available to any of those online. You don't have to do anything. Just don't respond or it locks me back into the question. Thanks!