Insufficient Cooling "Check-Check" Procedure - Clutch Cycling Orifice Tube (CCOT)

Use the following "Hand-Feel" procedure to quickly determine whether or not the A/C system has the proper charge of Refrigerant-12 (providing ambient air temperature is above 21°C (70°F). This check can be made in a matter of minutes, simplifying system diagnosis by pinpointing the problem to the amount of the R-12 charge in the system or by eliminating a low charge possibility from the overall checkout.

1. Engine must be warm and at normal idle speed.

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 surface, with the compressor engaged.

- BOTH THE SAME TEMPERATURE AND SOME DEGREE COOLER THAN AMBIENT: A sufficient charge exists. Check for other problems. Refer to "Inspection of the Refrigerant System" in this section.

- IF TEMPERATURES VARY: Charge is insufficient. Leak test and check for other problems.

- Leak test. If leak found, discharge and repair as required. Evacuate and charge.

- If no leak found, refer to the accompanying "CCOT- System Diagnostic Charts." Testing and Inspection