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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 525 (Symptom Troubleshooting [HVAC]) >> No.3 Airflow Mode Does Not Change >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
AIRFLOW MODE DOES NOT CHANGE - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT HEATER UNIT AIRFLOW MODE SYSTEM 
  • Inspect heater unit airflow mode links, airflow mode cranks, airflow mode rods, and wire clamp.
    • Is there grease on links and cranks?
    • Are links, cranks and rods installed securely and in the proper position?
    • Is wire clamp free of deformation?
  • Are above items okay?
 Yes Go to next step.
No Apply grease or install links, cranks and rods securely in their proper positions, repair or replace wire clamp, then go to Step 6.
2 VERIFY THAT AIRFLOW MODE WIRE FROM HEATER UNIT IS POSITIONED SECURELY AND CORRECTLY 
  • Is airflow mode wire positioned securely and correctly in relation to the heater unit airflow mode links?
 Yes Go to next step.
No Adjust airflow mode wire or install correctly, then go to Step 6.
3 INSPECT CLIMATE CONTROL UNIT 
  • Inspect climate control unit.
    • Is bevel gear set properly engaged?
    • Is airflow mode wire properly installed in correct direction on bevel gear?
    • Is wire clamp free of deformation?
  • Are above items okay?
 Yes Go to next step.
No Properly engage bevel gear set or install airflow mode wire in correct direction, repair or replace wire clamp, then go to Step 6.
4 INSPECT HEATER UNIT AIRFLOW MODE DOORS 
  • Is there any foreign material or obstructions in any of heater unit doors?
 Yes Remove obstruction, then go to Step 6.
No Go to next step.
5 VERIFY THAT ALL AIRFLOW MODE DOORS WITHIN HEATER UNIT ARE POSITIONED SECURELY AND PROPERLY 
  • Are all doors within heater unit securely and properly positioned?
 Yes Check each door for cracks or damage, then go to next step.
No Install malfunction doors securely in proper position, then go to next step.
6 VERIFY THAT MALFUNCTION SYMPTOM DOES NOT OCCUR AFTER REPAIR 
  • Does airflow mode change?
 Yes Troubleshooting completed. Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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