Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI1992M30 2D CONVERTIBLEREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATIC
1992 Infiniti M30 2D Convertible
A/C-Heater System - Automatic
1992 Infiniti M30 2D ConvertibleSECTION A/C-Heater System - Automatic
- A/C System Specifications (1990)
- A/C System Specifications (1991-92)
- Description
- Operation
- Adjustments
- Trouble Shooting
- Notes
- Self-Diagnostic Information
- Entering/Exiting Self-Diagnostics
- Self-Diagnosis Step 1
- Self-Diagnosis Step 2
- Self-Diagnosis Step 3
- Self-Diagnosis Step 4
- Self-Diagnosis Step 5
- Auxiliary Mechanism Test
- Preliminary Check Charts
- Notes
- Preliminary Check 1 - Air Outlet Does Not Change
- Preliminary Check 2 - Intake Door Does Not Change
- Preliminary Check 3 - Insufficient Cooling
- Preliminary Check 4 - Insufficient Heating
- Preliminary Check 5 - Blower Motor Is Malfunctioning
- Preliminary Check 6 - Magnet Clutch Does Not Engage
- Preliminary Check 7 - Discharged Air Temp Does Not Change
- Diagnostic Procedure Charts
- Notes
- Diagnostic Procedure 1 - Ambient Temp. Sensor Circuit Is Open
- Diagnostic Procedure 2 - In-Vehicle Temp. Sensor Ckt. Is Open
- Diagnostic Procedure 3 - Intake Sensor Circuit Is Open
- Diagnostic Procedure 4 - Sunload Sensor Circuit Is Open
- Diagnostic Procedure 5 - Potentiometer Balance Resistor Circuit Is Open
- Diagnostic Procedure 6 - Ambient Temp. Sensor Ckt. Shorted
- Diagnostic Procedure 7 - In-Vehicle Temp. Sensor Ckt Shorted
- Diagnostic Procedure 8 - Intake Sensor Circuit Is Shorted
- Diagnostic Procedure 9 - Sunload Sensor Circuit Is Shorted
- Diagnostic Procedure 10 - Potentiometer Balance Resistor Circuit Shorted
- Diagnostic Procedure 11 - Radiator Fan Does Not Operate
- Diagnostic Procedure 11/Radiator Fan Does Not Operate (1992)
- Diagnostic Procedure 12 - Mode Door Motor NotOperating Normally
- Diagnostic Procedure 13 - Intake Door Motor Does Not Operate Normally
- Diagnostic Procedure 14 - Air Mix Door Does Not Operate Normally
- Diagnostic Procedure 15 - Blower Motor Operation Is Malfunctioning
- Diagnostic Procedure 16 - Magnet Clutch Does Not Engage
- Diagnostic Procedure 16 - Magnet Clutch Does Not Engage (1992)
- Diagnostic Procedure 17 - Self-Diagnosis Cannot Be Performed
- Testing
- Removal & Installation
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.