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As Rollguy says, site glass is not used for checking freon with a 134a system.
If everything is as it was last year and vent temp's are higher then something has changed....disregarding the obvious in that statment, you have to search for something that is not operating, or in the same condition as last year....items I would look for as as follows:
Firewall holes allowing heat in.
Blend door not fully closed.
Fan down stream obstruction.
Fan air entry obstruction.
Door seals still good.
Recirc' door bleeding outside air.
Oil pooling in evaporator.
TXV beginning to fail.
Aux' fans operation.
(ETR passed your test.)
Corrosion internally.
Coolant bleed into heater core.
Suction vane failure in compressor....I would like to see 25 psi low side.
Hose internal failure restricting freon flow.
Condensate drain restricted . Check oe foam drain hose for breaking up.
Humidity changed since last years recorded vent temp's?
Wednesday here in OKC will be 99F at 5pm so I am expecting a rash of calls about a/c performance from several customers.
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