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Pressures OK and everything working but no cold air!

Holinder on Thu June 24, 2010 9:18 PM User is offline

Year: 1972
Make: Rolls Royce
Model: Silver Shadow
Refrigerant Type: R12
Pressure Low: 24psi
Country of Origin: United Kingdom

I have an Expansion Valve, Evaporator, Suction Throttling Valve, Compressor, Condenser, Receiver/Drier configuration.
Can measure down to 24psi at the Suction Throttling Valve with A/C full on.
No high side port to measure.
Compressor pipes hot and luke warm.
Liquid at the Sight Glass.
Outlet air at 70F with 85F outside ambient.
The 24psi would appear to indicate that the evaporator should be at 32F (using R12) but it isn't.
Any comments as to the problem, expansion valve? undercharged? compressor?
Thanks

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