During an AC performance test, an R-134a air conditioning system has a measured center duct outlet temperature of 41 degrees F. The manifold gage set shows low side pressure between 21-35 psi. The high side pressure ranges from 175-210psi. Intermittantly, the duct outlet temperature will rise to 60 degrees F and the low side gage show a vacuum when this happens. Shop Temperature is 72 degrees F. What is most likely the cause?
a. The system contains moisture causing a restriction in the TXV
b. The system contains air with the refrigerant
c. The TXV is defective and allowing too much refrigerant to flow
d. The system is operating normally
A. The system contains moisture causing a restriction in the TXV
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