Inspect

TM 5-4120-361-14 b. Inspect. (1) Refer to figure 4-4 and remove top front cover. (2) Remove the valve cover and in- spect coil for cracks, breaks, loose connections, frayed wires or other de- fects. (3) During the cooling cycle, in- spect the compressor suction line. If it feels hot, the pressure equalizing solenoid valve (figure 5-7) is defec- tive. (4) Report all defects to direct supprt maintenance. c. Test. Test the pressure equaliz- ing solenoid valve for continuity across electrical leads with a multimeter. If no continuity is indicated, the valve is defective and should be replaced. Re- port all defects to direct support main- tenance. 4-38. Expansion Valve (Primary) Inspec- tion and Test. a. General. If the air conditioning units is not cooling properly, inspect and test the expansion valve for de- fects. b. Inspection. (1) Refer to figure 4-4 and remove top front cover. (2) Refer to figure 4-22 and para 5-29c(4) and check that the required length of the expansion valve’s sensing bulb is fully in the suction line bulb well. (3) Refer to figure 4-22 and exam- ine the flow restrictor capillary tubes carefully. They should be very cold and evenly frosted. Unfrosted tubes are blocked and should be re-placed. (4) If none of the capillary tubes is cold and frosted, the valve is Figure 4-22. Expansion valve, primary 4-33