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Test 17A - Automatic Temperature Control

WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure system contains proper refrigerant charge. Connect DRB. Turn ignition on. Retrieve codes. If no trouble codes exist, go to next step. If trouble codes exist, perform TEST 19A.
  2. Start engine. Press one ATC head switch at a time while observing ATC control panel. If control panel is not completely blank, go to next step. If control panel is completely blank, turn engine off, turn ignition on, and perform TEST 18A.
  3. Turn engine off. Turn ignition on. If beep occurred each time a button was pressed, go to next step. If beeps did not occur as specified, perform TEST 20A.
  4. Attempt to operate rear window defroster. If it works properly, go to next step. If it does not work properly, repair as necessary.
  5. If all functions are normal except that blower runs at high speed only, perform TEST 17B. If operation is not as specified, go to next step.
  6. If blower motor is not off at all times, go to next step. If blower motor is off at all times, perform TEST 22A.
  7. Start engine. Turn A/C on. Rotate fan speed control. If fan speed operation is normal, go to next step. If fan speed is not as specified, perform TEST 17E.
  8. If no problems exist with aspirator and in-vehicle temperature sensor, go to next step. If problems exist, perform TEST 23A.
  9. Press A/C button. If compressor clutch engages, go to next step. If compressor clutch does not engage, perform TEST 24A.
  10. Turn engine off. Turn ignition on. If all Yellow switch lights operate, go to next step. If any switch light does not operate, replace ATC control. Perform VERIFICATION TEST.
  11. Using DRB, command ATC mode door to position between panel and defrost. If voltage display changes with door position, go to next step. If voltage display does not change, perform TEST 17C.
  12. Using DRB, command ATC blend door to position between hot and cold. If voltage display changes with door position, go to next step. If voltage display does not change, perform TEST 17D.
  13. Using DRB, command ATC Vacuum Fluorescent Display (VFD) sequence. If all segments are operative, go to next step. If any segment is inoperative, replace ATC control. Perform VERIFICATION TEST.
  14. If ATC system modulates blower operation on hot sunny days as vehicle operates in sun or shade, go to next step. If blower operation is not as specified, perform TEST 17F.
  15. Turn on parking lights. Operate instrument light dimmer control. If no problem with panel lights exists, go to next step. If problem exists with ATC head panel lights, repair panel light circuit.
  16. Turn off parking lights. Start engine. Again retrieve trouble codes. If no codes exist, go to next step. If codes exist, perform TEST 19A.
  17. All monitored electrical circuits are okay. Vehicle may have mechanical or thermal A/C-heater system component problem.
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