Jaguar XJ (X350). Manual — part 1211

9

—

Pin

10

—

Evaporator outlet port—low pressure gas

11

—

Housing

The thermostatic expansion valve has the following characteristics:

•

It is mounted on the evaporator core supply and return lines.

•

It is a block-type valve.

•

It contains an internal sensing bulb to increase the effectiveness of temperature sensing.

•

It is not serviceable. A new thermostatic expansion valve must be installed as a unit.

Pressure Cut Off Switch

The pressure cut off switch monitors the A/C compressor discharge pressure and communicates with

the engine control module (ECM). The ECM will interrupt A/C compressor operation in the event that

the pressure cut off switch indicates high system discharge pressures. It is also used to sense no or

low charge conditions. If the pressure is below a predetermined value for a given ambient

temperature, the ECM will interrupt A/C compressor operation.

•

The pressure cut off switch is mounted on a Schrader-type valve fitting on the compressor to
condenser discharge line.

•

A valve depressor, located inside the threaded end of the pressure cut off switch, presses on
the Schrader valve stem and allows the pressure cut off switch to monitor the compressor
discharge pressure.

•

When the compressor discharge pressure rises to approximately 2,896 kPa (420 psi), the
ECM will interrupt the compressor operation and disable the compressor.

•

When the pressure drops to approximately 1,724 kPa (250 psi) the ECM will enable the A/C
compressor circuit.

Service Gauge Port Valves

WARNING: Wear eye protection when opening/servicing the service gauge port valves.

The high-pressure service gauge port valve is located on the tube assembly - condenser to

thermostatic expansion valve.

The low pressure service gauge port valve is located on the manifold and tube assembly - A/C

compressor.

Item

Part Number

Description

1

—

A/C charging valve cap

2

—

Low pressure service gauge port valve

3

—

Schrader-type valve

4

—

O-ring seal

5

—

High pressure service gauge port valve

6

—

A/C charging valve cap

The fitting is an integral part of the refrigerant line or component.

•

Special couplings are necessary for both the high side and low side service gauge ports.

•

A new Schrader-type valve can be installed if the seal leaks.

•

Always install the A/C charging valve cap on the service gauge port valves after repairing the
refrigerant system.

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Diagnosis and testing

Air Conditioning

For additional information refer to<<412-00>>

Removal and installation

Air Conditioning (A/C) Compressor - 3.0L
NA V6 - AJ27, VIN Range: G00442-
>G45703 (82.10.20)

Removal

All vehicles

1

.

Carry out the air conditioning (A/C) system recovery procedure.

For additional information, refer to Air Conditioning (A/C) System Recovery, Evacuation and

Charging (82.30.30)

2 . Disconnect the battery ground cable.

For additional information, refer to Battery Disconnect and Connect

3 . Remove the air cleaner.

For additional information, refer to Air Cleaner (19.10.05)

4

.

Detach the accessory drive belt.

1) Rotate the accessory drive belt tensioner counter-clockwise.

Use a 3/8 inch square drive bar to rotate the accessory drive belt

tensioner.

2) Detach the accessory drive belt.

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