Compressor Isolating

Oil level on Air-Temp, Tecumseh, and York compressors may be checked with compressor mounted in vehicle. If these compressors are equipped with stem-type service valves, compressor may be "isolated", thereby avoiding necessity of discharging entire system (see COMPRESSOR ISOLATING  or related paragraphs). General Motors (6 Cylinder) compressors may have to be removed from vehicle for oil check, as filler plug is located near the bottom of the compressor (refer to appropriate method for procedures). After oil level is checked and adjusted, A/C system must be evacuated and recharged before it can be put back into service.

On York and Tecumseh compressors which have stem-type service valves (at compressor suction and discharge ports), it will not be necessary to discharge the entire system in order to open the compressor for oil checking (or other compressor service). See  YORK & TECUMSEH COMPRESSORS   in this Section, A/so refer to  Compressor Replacement   in COMPONENT REPLACEMENT Section  .