Nissan Sentra Service Manual: System description

Nissan Sentra Service Manual / Ventilation, heater & air conditioner / Heater & air conditioning system / System description

Refrigeration system

Component part location

High-pressure service port
High-pressure pipe
Expansion valve
Low-pressure service port
Low-pressure flexible hose
Compressor
Refrigerant pressure sensor
Condenser and liquid tank assembly
High-pressure flexible hose

Refrigerant cycle

Refrigerant flow

Electric compressor
Pressure relief valve
Liquid tank
Refrigerant pressure sensor
Condenser
Expansion valve
Evaporator
Blower motor

High-pressure gas
High-pressure liquid
Low-pressure liquid
Low-pressure gas
Suction port
Discharge port
Outside air

Refrigerant Flow

The refrigerant from the compressor flows through the condenser and liquid tank, the evaporator and returns to the compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.

Freeze Protection

To prevent the evaporator from freezing up, the evaporator air temperature is monitored by the intake sensor and the voltage signal to the A/C auto amp. makes the A/C relay go OFF and stop the compressor

Refrigerant system protection

Refrigerant pressure sensor

The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the liquid tank. If the system pressure rises above or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.

The ECM then ceases to supply power to the A/C relay which disengages and stops the compressor when pressure on the high pressure side (as detected by refrigerant pressure sensor) is over approximately 2,746 kPa (28 kg/cm2, 398 psi), or below approximately 120 kPa (1.22 kg/cm2, 17.4 psi).

Pressure Relief Valve

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.

When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/ cm2, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere.

Preparation

Special service tool The actual shape of the tools may differ from those illustrated here. HFC-134a (r-134a) service tool and equipmen.T. Do not mix HFC-134a (R-134a) refrigerant and/or its s ...

Basic inspection

Diagnosis and repair workflow Workflow OVERALL SEQUENCE DETAILED FLOW 1.INTERVIEW CUSTOMER Interview the customer to obtain as much information as possible about the conditions and environm ...

Other materials:

C1607, C1608 EPS Control unit
DTC Logic DTC DETECTION LOGIC Dtc Display item Malfunction detected condition Possible cause C1607 EEPROM When the memory (EEPROM) system malfunction is detected in EPS control unit. Eps control unit C1608 CONTROL UNIT When the internal malfuncti ...

C1130 Engine signal
DTC Logic DTC DETECTION LOGIC DTC Display Item Malfunction detected condition Possible causes C1130 ENGINE SIGNAL 1 When a malfunction is detected in ECM system. ECM ABS actuator and electric unit (control unit) CAN communication line ...

Control buttons
The control buttons for the Bluetooth® Hands-Free Phone System are located on the steering wheel. PHONE/SEND Press the button to initiate a VR session or answer an incoming call. You can also use the button to interrupt the system feedback and give a command at once. See “L ...