ATC Tester J-23678: Notes
This tester is designed for use on all 1974 General Motors automatic A/C systems, except the rear unit installed in Cadillac 75 Series. J-23678 can be used to check the operation of the system on the car and will isolate the malfunction in system components as follows: Control Panel, Sensor String, Vacuum System, or Programmer. After preliminary testing, the actual malfunction can be determined quickly. The tester can also be used to test individual components in the programmer.