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A/C-Heater Control Test

WARNING: This page is about a different car, the 1998 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform NORMAL SYSTEM RESPONSE TEST . Ambient temperature must be 48°F (9°C) or greater. Bring engine to operating temperature and let idle. Set air delivery mode to PASS ZONE. Set A/C-heater control panel temperature to 85°F (29°C) and passenger control panel to coldest temperature. Let system stabilize. Compare outlet temperatures at left center and right center outlets. If right center outlet air temperature is 8-15°F (4-11°C) cooler than left center, go to next step. If outlet air is not cooler, check door motor for proper mounting, broken components or missing/disconnected linkage. Repair as necessary.
  2. Set A/C-heater control panel temperature to 85°F (29°C) and passenger control panel to hottest temperature setting. Let system stabilize. Compare outlet temperatures at left center and right center outlets. If right center outlet air temperature is 8-15°F (4-11°C) warmer than left center, system is operating properly. If outlet air is not warmer, check door motor for proper mounting, broken components or missing/disconnected linkage. Repair as necessary.
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