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Does anyone have the list of and how to test the engine and heating/AC system with the diagnostic connectors under the hood of the 1977 and later Chevy Impala and other cars? I am trying to find the list of tests and how the tests are done. I know that the connectors are orange in color, one is on the left side of the engine compartment for the engine and the other is one the right side on the heater, AC evaperator, and fan box. If you have the test information or know where I can find it that would be helpful.
 
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