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:

Audio operation precautions
Compact disc (CD) player CAUTION Do not force a compact disc into the CD insert slot. This could damage the CD and/or CD player. Trying to load a CD with the CD door closed could damage the CD and/or CD player. Only one CD can be loaded into the CD player at a time. Only ...

Diagnosis and repair work flow
Work Flow OVERALL SEQUENCE DETAILED FLOW 1.COLLECT INFORMATION FROM THE CUSTOMER Get detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred) using the diagnostic worksheet. Refer to BRC-52, "Diagnostic Wor ...

Front wheel hub
Exploded View Steering knuckle Splash guard Wheel stud Wheel hub and bearing Disc brake rotor Wheel hub lock nut Nut retainer Cotter pin Removal and Installation Remove the wheel and tire using power tool. Refer to WT-47, "Exploded View". Remove the brake ...