Air Conditioning problem
2001 Isuzu Rodeo Question 6 cyl Four Wheel Drive Automatic 97000 miles
Recently purchased so I'm not aware of the history, although I did buy it knowing that the A/C doesn't work. The system is an accumulator-drier, expansion valve system.
Hooked up guages, low and high side pressures both at zero.
Pulled vacumn to -30 Hg for 20 minutes, then shut off compressor and let sit for another 30 minutes. The needle remained dead on at -30 Hg, which surprised me, since I expected a leak.
Proceeded to add one can (12 oz.) R-134a to low pressure side. Started engine, ac on, fan on high. Jumped pressure switch and compressor clutch engages immediately, no noise or anything out of the normal, compressor seems to be working. Low and High pressures jump to 70, with compressor running and it then remains stable at 70 on both sides. At this pressure, the compressor now runs on its own continuously, although it can be activated on or off with the A/C switch on the control panel in the dash board, based on what is selected.
So my question is. What next? Could the 70 pressure (low and high) be solely from the can off freon, even though the compressor seems fully operational otherwise, or are these pressure a result of at least some compressor action? Also, the system seems to be open across the expansion valve or compressor, since there is no difference between the high and low side.
Any suggestions? Thanks
Monday, September 20th, 2010 AT 3:05 PM