Functional Test/Check

Use the following Cycling Clutch Orifice Tube (CCOT) "Hand-Feel" procedure if the A/C system has the proper charge of Refrigerant-12 (providing ambient temperature is above 21°C (70°F).
1. Engine must be warm (CHOKE OPEN and OFF FAST IDLE SPEED CAM) and at normal idle speed. Diesel engine at normal idle.
2. Hood and body doors open.
3. Selector (mode) lever set at NORM.
4. Temperature lever at COLD.
5. Blower on HI.
6. "Hand-Feel" the temperature of the evaporator inlet pipe after the orifice and accumulator with the compressor engaged.
- BOTH THE SAME TEMPERATURE AND SOME DEGREE COOLER THAN AMBIENT-Proper condition: check for other problems.
- INLET PIPE COOLER than accumulator surface indicates a low refrigerant charge.
^ Add amounts 120 ml (4 ounces) of refrigerant UNTIL BOTH feel the same temperature. Allow stabilization time between additions.
^ Then add 420 ml (14 oz.) one can additional refrigerant. The 420 ml (14 oz.) disposable can of Refrigerant-12 is the equivalent to .88 lbs..Testing and Inspection