Nissan Altima 2007-2012 Service Manual: Refrigeration system
Refrigerant Cycle
Refrigerant flow
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank, through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is controlled by an externally equalized expansion valve, located inside the evaporator case.
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 condenser. 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.
Function information
Component Part Location
ENGINE COMPARTMENT
1. A/C compressor F3
2. Ambient sensor E211
3. Refrigerant pressure sensor E219
4. A/C relay (internal to IPDM E/R)
1. A/C compressor F3
2. Ambie ...
Automatic air conditioner system
System Diagram
CONTROL SYSTEM
The control system consists of input sensors, switches, front air control and
outputs. The relationship of these
components is shown in the figure below:
System ...
Other materials:
Precaution
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”,
used along
with a front seat belt, helps to reduce the risk or severity of injury to the
dr ...
Operating tips
● When the shift lever is shifted to R (Reverse),
the monitor screen automatically
changes to the RearView Monitor mode.
However, the radio can be heard.
● It may take some time until the RearView
Monitor is displayed after the shift lever has
been shifted to R (Reverse). Objects ...
BCM (Body control module)
Reference Value
VALUES ON THE DIAGNOSIS TOOL
Terminal Layout
Physical Values
1: Sedan only
2: With LH front window anti-pinch
3: With LH and RH front window anti-pinch
4: With Intelligent Key
5: Without Intelligent Key
Wiring Diagram-Coupe
...