ATC Tester J-23678: Notes
This tester is designed for use on all 1971-72 General Motors automatic A/C systems except the rear unit installed in Cadillac 75 Series, (see ATC Tester Table at end of this article). J-23678 can be used to check the operation of the system on the car and will isolate the malfunction in one of the system components as follows: Control Panel, Sensor String, Vacuum System, or the Programmer. After this preliminary test, the actual malfunction can be determined quickly. The tester can also be used to test components contained in the programmer.