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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.
NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT COOLANT TEMPERATURE 
  • Is coolant sufficiently warmed up?
 Yes Go to next step.
No Warm engine up, then go to Step 7.
2 INSPECT HEATER UNIT AIR MIX SYSTEM 
  • Inspect heater unit air mix links, air mix cranks, air mix rods, and wire clamp.
    • Is there grease on links and cranks?
    • Are links, cranks, and rods securely installed in their proper positions?
    • 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 7.
3 VERIFY THAT AIR MIX WIRE FROM HEATER UNIT IS POSITIONED SECURELY AND CORRECTLY 
  • Is air mix wire securely installed in the correct position in relation to heater unit air mix links?
 Yes Go to next step.
No Adjust air mix wire or install securely in correct position then go to Step 7.
4 INSPECT CLIMATE CONTROL UNIT 
  • Inspect climate control unit.
    • Is bevel gear set properly engaged?
    • Is air mix wire properly installed in correct position in relation to bevel gear?
    • Is wire clamp free of deformation?
  • Are above items okay?
 Yes Go to next step.
No Properly engage bevel gear or install air mix wire in correct position, repair or replace wire clamp, then go to Step 7.
5 INSPECT HEATER UNIT AIR MIX DOOR 
  • Is there any foreign material or obstruction in heater unit air mix doors?
 Yes Remove obstruction, then go to Step 7.
No Go top next step.
6 VERIFY THAT AIR MIX DOOR WITHIN HEATER UNIT IS POSITIONED SECURELY AND PROPERLY 
  • Is heater unit air mix door securely and properly installed?
 Yes Check air mix door for cracks or damage, then go to next step.
No Install air mix door securely in proper position, then go to next step.
7 VERIFY THAT MALFUNCTION SYMPTOM DOES NOT OCCUR AFTER REPAIR 
  • Does unit operate in every temperature setting?
 Yes Troubleshooting completed. Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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