TB-9-2510-251-13 HMMWV Operator and Field Maintenance, Installation & Parts Add-On-Armor Air Conditioning Download
Page 292 of 624
4-16 TB 9-2510-251-13 UNIT TROUBLESHOOTING (Cont’d) 2. THERMOSTATIC SWITCH MALFUNCTION Step 1. Does gauge read as shown? If yes, replace thermostatic switch. If no, go to low refrigerant charge in system. 3. LOW REFRIGERANT CHARGE IN THE SYSTEM Step 1. Does gauge read as shown? If yes, go to step 2. If no, go to step 3. Step 2. Are there bubbles in the sight glass and air from the vents only slightly cool? If yes, check for leaking connections or hoses and add refrigerant to the system. Step 3. Are there cool spots in the high pressure line or receiver drier? If yes, replace component with cool spot. If no, Check TXV function.