LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Heater Systems) >> Symptom Tests >> Test F: Blower Motor Malfunction

Test F: Blower Motor Malfunction

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: The blower motor operates in at least one, but not all, speed positions.
  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. Position mode switch in the vent position. Place the blower motor switch in each speed position. Does the blower motor operate properly in each speed position? If so, condition is intermittent. See TROUBLE SHOOTING . If not, go to next step.
  3. Turn the ignition off. Disconnect the blower motor. Turn the ignition on, with the engine off. Connect a test light between the blower motor supply voltage circuit and ground. Place the blower motor switch in each speed position. Does the test light illuminate in each speed position? If so, go to step  7. If not, go to next step.
  4. Turn the ignition off. Disconnect the blower motor resistor assembly connector. Turn the ignition on, with the engine off. Connect a test light between the battery voltage circuit of the blower motor resistor assembly and ground. Does the test light illuminate? If so, go to next step. If not, go to step  10.
    5. NOTE: The blower motor switch must be in the correct speed position for the blower motor control circuit being tested.
  5. Probe each blower motor control circuit with a test light that is connected to ground. Place the blower motor switch in the appropriate speed position for the blower motor control circuit being tested. Does the test light illuminate in each speed position? If so, go to step  8. If not, go to next step.
  6. Check the suspect blower motor control circuit for an open. Did you find and correct the condition? If so, go to step  14. If not, go to step  9.
  7. Inspect for poor connections at the harness connector of the blower motor assembly. Did you find and correct the condition? If so, go to step  14. If not, go to step  11.
  8. Inspect for poor connections at the harness connectors of the blower motor resistor assembly. Did you find and correct the condition? If so, go to step  14. If not, go to step  12.
  9. Inspect for poor connections at the harness connector of the HVAC control assembly. Did you find and correct the condition? If so, go to step  14. If not, go to step  13.
  10. Repair the battery voltage circuit of the blower motor resistor assembly. After repairs are complete, go to step  14.
  11. Replace the blower motor. See BLOWER MOTOR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  14.
  12. Replace the blower motor resistor assembly. See BLOWER MOTOR RESISTOR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  14.
  13. Replace the HVAC control assembly. See HVAC CONTROL ASSEMBLY  under REMOVAL & INSTALLATION. After repairs are complete, go to step  14.
  14. Operate the system in order to verify the repair. Did you correct the condition? If so, system is okay. If not, go to step  3.
scientia non olet · About LEMON Manuals