How can I access my middle a/c's evaporator to verbs it?
Answers: If your element is 28 years old you owe it to yourself to replace it. A illustrious efficiency system will rescue you 35% on your electric cost. For example if your cooling bill is $300 per month then by replacing it you recover $100 per month. However if you want to just verbs the coil: If it is in a closet (upflow) you will hold to remove the front cover of the cased coil. slide the coil out and then using hydrofloric bitter, spray the coil from the under side, after rinse the acid sour with dampen, it works best if the coil is removed & taken outside and cleaned. However I think you are wanting the lowest expensive way out. If the coil is located surrounded by the attic (horizontal) cut a hole in the transition and verbs it with sour again rinsing it with marine. Be careful near the acid, it will burn your skin and eyes if it get on you. However it has be my experience that coils of this age range usually develop a freon dribble after they have be disturbed. A licensed service company will usually do this for $250-350. Good luck. But it may not be cooling well for other reason as well, for example, a dirty nouns filter, coils outside are dirty, or it is low on refrigerant. Best Of luck..
Take apart the air conditioner.
Are you sure it wants only cleaning? Have you checked the freon? That could be a huge factor.
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