C 1500 Yukon 2WD V8-4.8L VIN V (2000)
Steps 10-15
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step tests for a inoperative mode actuator in one mode position(s) or in the wrong mode position(s).
3. This step tests for a inoperative recirculation actuator in one mode position(s) or in the wrong mode position(s).
4. This step tests for A/C system performance that is correct for the for the conditions at hand, that would mandate a state of automatic recirculation
mode being active. Automatic recirculation mode will become active when the A/C high side pressure reaches 350 PSI ± (30 PSI) and remain ON
until the high side pressure drops below 240 PSI. In automatic recirculation mode their will be no indication on the HVAC controller that the
mode is active, the Out Side Air (OSA) and Recirculation (REC) switches and indicators will be inoperative on the HVAC controller.
8. This step tests for a internally shorted A/C high pressure recirculation switch causing the automatic recirculation mode to be active.
Defrosting Insufficient
Steps 1-4
