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 MANUALSNISSAN-DATSUN2012SENTRA SE-RREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSMANUAL AIR CONDITIONER
2012 Nissan-Datsun Sentra SE-R
Manual Air Conditioner
2012 Nissan-Datsun Sentra SE-RSECTION Manual Air Conditioner
- Service Information
- Precautions
- Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
- Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
- Precaution For Work
- Precaution for Working with HFC-134a (R-134a)
- Contaminated Refrigerant
- General Refrigerant Precaution
- Precaution for Leak Detection Dye
- A/C Identification Label
- Precaution for Refrigerant Connection
- Precaution for Service of Compressor
- Precaution for Service Equipment
- Preparation
- Refrigeration System
- Oil
- Air Conditioner Control
- Trouble Diagnosis
- How to Perform Trouble Diagnosis for Quick and Accurate Repair
- Component Parts and Harness Connector Location
- Schematic
- Wiring Diagram - HEATER -
- Wiring Diagram - A/C, M -
- Front Air Control Terminal and Reference Value
- CONSULT Function (BCM)
- CONSULT Function (IPDM E/R)
- Operational Check
- Power Supply and Ground Circuit for Front Air Control
- LAN System Circuit
- Mode Door Motor Circuit
- Air Mix Door Motor Circuit
- Intake Door Motor Circuit
- Blower Motor Circuit
- Magnet Clutch Circuit (If Equipped)
- Insufficient Cooling
- Insufficient Heating
- Noise
- Control Unit
- Front Blower Motor
- In-Cabin MICROFILTER
- Heater & Cooling Unit Assembly
- Heater Core
- Intake Door Motor
- Mode Door Motor
- Air Mix Door Motor
- Fan Control Amplifier
- Ducts And Grilles
- Removal and Installation
- Refrigerant Lines
- HFC-134a (R-134a) Service Procedure
- Component
- Removal and Installation for Compressor - MR20DE
- Removal and Installation for Compressor - QR25DE
- Removal and Installation for Low-Pressure Flexible Hose and Muffler Pipe
- Removal and Installation for High-pressure Flexible Hose
- Removal and Installation for High-pressure Pipe
- Removal and Installation for Refrigerant Pressure Sensor
- Removal and Installation for Condenser
- Removal and Installation for Evaporator
- Removal and Installation for Expansion Valve
- Checking of Refrigerant Leaks
- Checking System for Leaks Using the Fluorescent Leak Detector
- Dye Injection
- Electronic Refrigerant Leak Detector
- Service Data And Specifications (SDS)
- Precautions
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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.