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Test I: Improper Air Delivery

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit reference, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS  .
NOTE: The manufacturer does not separate testing by "heater only" or "air conditioned" vehicles. References to air conditioning operations or repairs may not apply to vehicles without air conditioning. References to some components also may not apply to vehicles without air conditioning.
NOTE: Definition: Air does not flow correctly from the air distribution outlets.
  1. Did you review the DESCRIPTION  and OPERATION  and perform the necessary inspections? If so, go to next step. If not, go to DESCRIPTION  and OPERATION  , then go to next step.
  2. Turn the ignition on, with the engine off. Place the blower motor switch in the Off position. Is the blower motor Off? If so, go to next step. If not, go to TEST D: BLOWER MOTOR ALWAYS ON .
  3. Place the blower motor switch in each speed position. Does the blower motor operate at all? If so, go to next step. If not, go to TEST E: BLOWER MOTOR INOPERATIVE .
  4. Does the blower motor operate correctly for each speed position? If so, go to TEST M: VACUUM CONTROL SYSTEM DIAGNOSIS . If not, go to TEST F: BLOWER MOTOR MALFUNCTION .
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