A/C Compressor -, Removing and Installing

A/C Compressor -8- cylinder Engine, Removing And Installing

General information
8-cylinder models are equipped with Denso compressor 7SEU16. This compressor is driven continuously when the engine is running (no A/C clutch present).

Compressor output is regulated by the Climatronic control module -J255- based on input signals from high pressure sensor -G65- and control of signal to A/C compressor regulator valve -N280-.

Compressor regulator valve -N280- is not activated with empty refrigerant circuit (compressor idles with engine).

An internal oil circuit in the compressor ensures the compressor is not damaged when the refrigerant circuit is empty. This feature depends on a residual amount of refrigerant oil being present in the circuit.

Special tools, testers, measuring instruments and auxiliary items required







- Torque wrench (5 - 50 Nm)







- Kent-Moore ACR4 (or equivalent)

Removing
- Discharge refrigerant system.
- Remove ribbed belt.







- Remove refrigerant line retainers from oil pan.
- Remove windshield washer reservoir.
- Remove power steering pump from bracket and lay to side; hoses remain connected.

NOTE: Note installation position of two upper spacer sleeves when removing power steering pump bracket, item - 3 -.

- Remove power steering pump bracket.







- Remove both front stabilizer bar brackets -2- and pull stabilizer bar downwards.

NOTE: Before removing engine mount, support subframe from below.

- Remove left-engine mount carrier from subframe.
- Remove left hydraulic engine mount from carrier and engine mount support.







- Remove both fasteners -arrows- from cooling fan control module and remove.
- Tightening torque: 8 Nm (71 in. lb.)
- Disconnect electrical connectors and wiring as necessary.
- Remove securing bolts from compressor (leave refrigerant lines on bracket).
- Remove refrigerant lines from compressor and pull compressor out downwards.

Installing
Install in reverse order of removal, noting the following:

NOTE:
- Always use new seals at compressor refrigerant lines.
- Compressor refrigerant line hex socket bolts M8 - tightening torque: 25 Nm (18 ft.lb.)
- Ensure proper fit of compressor bracket spacer sleeves; item - 3 -.

- Turn compressor 10 revolutions (clockwise) by hand.
- Install ribbed belt
- Install hydraulic engine mount to mount carrier and engine mount support.
- Tightening torque: 23 Nm (17 ft.lb.)
- Install mount carrier to subframe.
- Switch on ignition (do not start engine!)
- Select "Econ" mode on Climatronic control head
- Start engine and wait until idle speed stabilizes.
- Open all instrument panel vents.
- Select "Low" temperature setting on Climatronic control head.
- Select "Auto" mode on Climatronic control head (compressor regulation activated) and allow engine to run for 5 minutes at idle.

CAUTION: Do not start engine with open refrigerant system (E.g.: refrigerant lines not connected to compressor or other refrigerant system components). Compressor will overheat and will be damaged.

If it is necessary to start engine with empty refrigerant circuit, proceed as follows:
- Refrigerant circuit must be fully assembled/closed.
- At least 1/4 of the prescribed refrigerant oil must be in the compressor.
- Engine speed must not exceed 2500 rpm.
- Run engine only as long as absolutely necessary.

Fig. 1 Ribbed belt, routing







NOTE: When installing belt ensure it is correctly seated in pulley.