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Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 2335

3. Align the tab on the sun sensor assembly (1) with

the opening in the instrument panel (2).

4. Gently push the sun sensor assembly into the

instrument panel until the sensor snap clip retain-
ers (3) are securely engaged.

5. Install the defroster grille (Refer to 23 - BODY/IN-

STRUMENT

PANEL/DEFROSTER

GRILLE

INSTALLATION).

6. Reconnect the negative battery cable.

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CONTROLS

TRANSDUCER-A/C PRESSURE

DESCRIPTION

The A/C pressure transducer (1) is a switch that is
installed on a fitting located on the A/C liquid line. An
internally threaded fitting on the A/C pressure trans-
ducer connects it to the externally threaded Schrader-
type fitting on the A/C liquid line. A rubber O-ring seals
the connection between the A/C pressure transducer
and the liquid line fitting. The A/C pressure transducer
is connected to the vehicle electrical system by a
molded plastic connector with three terminals.

OPERATION

The A/C pressure transducer monitors the pressures in the high side of the refrigerant system through its connection
to a fitting on the A/C liquid line. The A/C pressure transducer will change its internal resistance in response to the
pressures it monitors. A Schrader-type valve in the liquid line fitting permits the A/C pressure transducer to be
removed or installed without disturbing the refrigerant in the A/C system.

The powertrain control module (PCM) provides a five volt reference signal and a sensor ground to the A/C pressure
transducer, then monitors the output voltage of the A/C pressure transducer on a sensor return circuit to determine
refrigerant pressure. The PCM is programmed to respond to the A/C pressure transducer and other sensor inputs by
controlling the operation of the A/C compressor clutch and the radiator cooling fan to help optimize A/C system
performance and to protect the system components from damage. The PCM will disengage the A/C compressor
clutch when high side pressure rises above 3082 kPa (447 psi) and re-engage the clutch when high side pressure
drops below 2937 kPa (426 psi). The A/C pressure transducer will also disengage the A/C compressor clutch if the
high side pressure drops below 110 kPa (16 psi) and will re-engage the clutch when the high side pressure rises
above 221 kPa (32 psi). If the refrigerant pressure rises above 1655 kPa (240 psi), the PCM will actuate the cooling
fan. The A/C pressure transducer input to the PCM will also prevent the A/C compressor clutch from engaging when
ambient temperatures are below about 4.5° C (40° F) due to the pressure/temperature relationship of the refrigerant.

The A/C pressure transducer cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The A/C pressure transducer is diagnosed using a scan tool. Refer to 9 - Engine Electrical Diagnostics for more
information.

REMOVAL

NOTE: It is not necessary to discharge the refrigerant system to replace the A/C pressure transducer.

CONTROLS

24 - 375

NOTE: LHD model shown. RHD model similar.

1. Disconnect and isolate the negative battery cable.

2. Disconnect the wire harness connector (1) from the

A/C pressure transducer (2).

3. Remove the A/C pressure transducer from the A/C

liquid line (3) and remove and discard the O-ring
seal.

INSTALLATION

NOTE: Use only the specified O-ring as it is made of special material for R-134a. Use only refrigerant oil of
the type required for the A/C compressor.

NOTE: LHD model shown. RHD model similar.

1. Lubricate a new rubber O-ring seal with clean

refrigerant oil and install it onto the liquid line fitting.

2. Install the A/C pressure transducer (2) onto the A/C

liquid line (3). Tighten the A/C pressure transducer
securely.

3. Connect the wire harness connector (1) to the A/C

pressure transducer.

4. Reconnect the negative battery cable.

24 - 376

CONTROLS

DISTRIBUTION

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