I can hear the clutch cycling, radiator fan running and no unusual noises. I usually set the A/C for coldest air temp and put the thermometer in the center vent. This one is definitely not reaching full potential. I'm looking for the temperature to reach 50F or better and I don't see that happening here. Roughly at 75F and I have the constant clutch cycling.
I suspect there is a low refrigerant situation. Compressor clutch will cycle off if the pressure gets too low or too high. The scenario would be compressor clutch engages, low side pressure drops too much, clutch disengages. You can verify system problems with a set of gauges and monitoring both high and low side pressures. In this particular case though I think the best move now would be verify the system charge. Time to recover the refrigerant and see just how much is in the system. Something that I should mention is not possible with a "charge kit" from your local parts supplier.
Initial pressures are about 75. How much refrigerant is that? You can't answer the question from system pressure. You have to recover the refrigerant and weigh it. The recovery machine does that job very well.
We recovered 10 oz of refrigerant so roughly one-third of a full system charge was present. Set the machine to a correct charge and fill the system.
Now we have A/C!
With no obvious leaks we'll depend on the UV dye in the refrigerant to do its job if the charge gets low again over time.
Thanks for reading!
Kenny@ggauto.repair
