I looked at a 12 year old 10seer Trane R22 split system today and could not solve the problem.
Complaint: AC runs and cools but not sufficiently.
First thing I did was to check the pressures: 90 and 475 on R22 system, 82 degree outside ambient.
Then I took Superheat 38 and Subcool 25. BTW this is a distributer tube metering device so I know to concentrate on the Superheat.
Next I took temperature differentials across the Condenser 25 and Evap 9.
I looked around to see how dirty the coils other parts are and the coils did not look especially dirty so I did nothing to clean them. The furnace fan did have much buildup on the blades though.
What I'm stuck on is that both pressures are very high and the superheat is very high also. Advise please.
BTW how do I make a degree sign on the keyboard?