The air conditioning compressor is used to circulate the refrigerant in the system

The compressor shaft is installed in the aluminum front housing cover on bearings and sealed on the side of the drive pulley with an oil seal.

How to remove the A/C compressor on a Nissan Almera

The compressor drive pulley is mounted on a double-row ball bearing and constantly rotates when the engine is running.

When the air conditioner is turned on, the torque is transmitted from the pulley to the compressor shaft through a friction clutch with an electromagnetic drive.

How to remove the A/C compressor on a Nissan Almera

If the system is working, when the air conditioner is turned on, a click is heard - this is the clutch pressure plate, under the action of an electromagnet, engages with the drive pulley, and the compressor rotor starts to rotate.

But during the operation of the air conditioner, the following compressor malfunctions may occur.

If, when the air conditioner is off, the clutch makes extraneous sounds during rotation, heats up or smells of burning, then its bearing has probably begun to collapse.

In this case, the bearing must be replaced. In some advanced cases, it may be necessary to replace the compressor clutch assembly or its constituent parts.

If you don't hear a click after turning on the air conditioner, then the following problems may occur:

- there was a refrigerant leak, and the control system blocks the compressor from turning on;

- the pressure sensor in the system has failed;

- malfunctions in the electrical circuits of the control system;

- the coil winding of the clutch electromagnet burned out;

- the engine control unit for some reason (high engine coolant temperature, high engine speed) has blocked the compressor from turning on.

If the clutch rotates easily and freely, but when the air conditioner is turned on, extraneous noises are clearly audible or the engine even stalls, then the compressor is most likely stuck.

The internal pumping part of the compressor cannot be repaired. In this case, the compressor will have to be replaced.

If a click is heard, the clutch easily rotates the compressor shaft, and there is no coolness in the cabin. In this case, it only seems that the compressor is working, but in reality it is not pumping anything.

Only an experienced specialist with special control and diagnostic equipment can establish the truth.

The cause of the malfunction can be most accurately determined after a complete diagnosis at a specialized service center for the repair of automotive air conditioners.

Removing the air conditioning compressor

We install the car on a viewing ditch or lift

Remove the accessory drive belt (article - Replacing the accessory drive belt Nissan Almera)

Removing the protection of the power unit (article - Removing the protection of the Nissan Almera power unit)

Removing the front bumper (article - Removing Nissan Almera car bumpers)

We discharge the air conditioning system, for this:

How to remove the A/C compressor on a Nissan AlmeraHow to remove the A/C compressor of a Nissan Almera

- we release the refrigerant through valve 1 of the low pressure pipeline and valve 2 of the high pressure pipeline;

- unscrew the protective caps of the valves and press the valve stems with a suitable tool (we work in goggles).

If it is necessary to replace the valve, unscrew it from the pipeline fitting with a key, the same as the wheel valve cap

How to remove the A/C compressor on a Nissan AlmeraHow to remove the A/C compressor of a Nissan Almera

Remove the valve

Valve for charging and discharging refrigerant

How to remove Nissan Almera air conditioner compressorHow to remove the air conditioner compressor of Nissan Almera

Disconnect tip 2 wires from terminal 1 of the compressor electromagnetic clutch

With a head of 10, we unscrew the bolt securing the flange of the refrigerant supply pipe to the compressor

How to remove the A/C compressor of a Nissan AlmeraHow to remove the A/C compressor of a Nissan Almera

We remove the tip of the refrigerant supply pipe from the compressor hole

Remove the rubber o-ring from the tip of the tube

Having unscrewed the bolt of the refrigerant outlet pipe flange to the compressor with a 10 wrench

How to remove the A/C compressor of a Nissan AlmeraHow to remove the A/C compressor of a Nissan Almera

Remove the tip of the tube from the compressor hole

Remove the rubber o-ring from the tip of the tube

How to remove the A/C compressor on a Nissan AlmeraHow to remove the A/C compressor of a Nissan Almera

With a 10 head, unscrew the four bolts securing the compressor to the engine bracket

Removing the compressor

Before installing the compressor, we replace the sealing rings of the tips of the refrigerant inlet and outlet pipes with new ones.

Install the air conditioning compressor in reverse order

We charge the system with refrigerant and check the operation of the air conditioner at the maximum fan speed of the heater.

Replacing the compressor drive pulley bearing and replacing the compressor clutch electromagnet can be found in the article - Removing and repairing the air conditioning compressor