a. Air or non-condensables in system.
b. Restricted air flow across condenser. (Dirty condenser fins, etc.)
c. A restriction in the high pressure line between the compressor and the receiver tank.
d. Overcharge of refrigerant during warm ambients.
e. Fan drive belt slippage.
f. Incorrect refrigerant.
g. High ambient temperature.
h. High box temperature.
