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2008 - MX-5 - HVAC

NO.4 AIR INTAKE MODE DOES NOT CHANGE



4

No temperature control with climate control unit.

DESCRIPTION

  • Malfunction in A/C unit and/or climate control unit air intake system.

POSSIBLE CAUSE

  • A/C unit air intake link, air intake crank, air intake rod malfunction

  • Climate control unit rack-and-pinion, air intake wire malfunction

  • A/C unit air intake door malfunction

  • Heater piping malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT COOLANT TEMPERATURE

  • Is coolant sufficiently warmed up?

Yes

Go to the next step.

No

Warm engine up, then go to Step 8.

2

INSPECT A/C UNIT AIR INTAKE SYSTEM

  • Inspect A/C unit air intake links, air intake cranks, air intake rods, air intake actuator.

    • Is there grease on links and cranks?

    • Are links, cranks, and rods securely installed in their proper positions?

  • Are above items okay?

Yes

Go to the next step.

No

Apply grease or install links, cranks, and rods securely in their proper positions, repair or replace air intake actuator, then go to Step 8.

3

VERIFY THAT AIR INTAKE WIRE FROM A/C UNIT IS POSITIONED SECURELY AND CORRECTLY (IF AVAILABLE)

  • Is air intake wire securely installed in the correct position in relation to A/C unit air intake links?

Yes

Go to the next step.

No

Adjust air intake wire or install securely in correct position, then go to Step 8.

4

INSPECT CLIMATE CONTROL UNIT

Yes

Go to the next step.

No

Repair or replace climate control unit, then go to Step 8. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

5

INSPECT A/C UNIT

  • Is there any foreign material or obstruction in A/C unit air intake doors?

Yes

Remove obstruction, then go to Step 8.

No

Go to the next step.

6

INSPECT A/C UNIT AIR INTAKE DOORS

  • Is A/C unit air intake door securely and properly installed?

Yes

Inspect air intake door for cracks or damage, then go to the next step.

No

Install air intake door securely in proper position, then go to the next step.

7

INSPECT HEATER LINES

  • Inspect heater lines.

    • Is heater piping free of damage and cracks?

    • Are heater piping connections free of engine coolant leakage?

    • Are heater piping connections securely tightened?

    • Are heater piping installation points on A/C unit free of engine coolant leakage?

  • Are above items okay?

Yes

Operation is okay. Recheck malfunction symptoms.

No

If heater piping connections is loosed, tighten connections with specified torque.

Repair or replace heater piping, then go to the next step.

8

VERIFY THAT MALFUNCTION SYMPTOM OCCURS 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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