Dacia SuperNova (engine E7J). Manual - part 103

AIR CONDITIONING

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Basically, the air conditioning unit is formed of a closed circuit, composed by the following main

elements:

- evaporator
- compressor
- condenser
- thermostatic expansion valve
- connection pipes.

The evaporator is the component that extracts the heat from the passengers compartment and

is generally placed in the passengers compartment. In order to cool the passengers compartment
the hot air must be absorbed, the heat extracted and the “cooled” air redistributed. The hot air is
passing through the evaporator to who is giving part of the temperature reducing so, its own
temperature. The cooled air is so conveyed in the passengers compartment, progressively reducing
the temperature.

In the same time, the refrigerant fluid which goes into the evaporator, is absorbing the heat, from

air passing through the evaporator and at the same temperature, is transforming it from liquid into
vapors. At the evaporator exit, the refrigerant fluid is in vapor condition.

The evaporator is placed in the climate control unit and is protected by cases.

EVAPORATOR

EVAPORATOR CASES ASSEMBLY REPLACEMENT

DISMOUNTING
Disconnect the battery.
Drain the refrigerant circuit.
Dismount the sealing gaskets on the climate box outliner.
Dismount the thermostatic expansion valve.
Dismount the climate case locking plate.
Disconnect the pipes evaporator – compressor and evaporator – tank filter.
Dismount the evaporator cases attachment nuts, on the right side.
Release the  evaporator cases.
Replace the assembly.

AIR CONDITIONING

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REMOUNTING
Perform the dismounting operations in  the reverse order.
Fill the refrigerant circuit and check the good operation of the climate control system.

NOTE
Ensure that evaporator finned plates are not deformed and they are not excessive

dirty.

The tightening nuts for the climate and conditioning assembly, the connections for piping,

condenser and filter tank, must have the following tightening moments:

- thread 3/4” – 16 pitch/l” – at the moment 18-20 Nm;
- thread 5/8” -  18 pitch/l” – at the moment 14-20 Nm.

The tightening moment of the compressor flange attachment screw -12+/-1,2 Nm.
The tightening moment of the thermostatic probe attachment screw -5,7+/-0,5 Nm.
The tightening moment of the pressure capture - 20,7+/-2 Nm.

NOTE
After each operation that implies the disconnection of the battery, at its reconnection,

introduce the radio code that is written on the vehicle-selling invoice.

 EVAPORATOR

AIR CONDITIONING

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The compressor is absorbing the vapors coming from the evaporator at low pressure and

temperature, is compressing them and convey the gas at high temperature and pressure.

The refrigerant fluid in high pressure and temperature vapor condition is entering in the second

heat exchanger, which by condensation is transmitting the heat to the external environmental.

At the exit

 from the condenser, the refrigera

nt fluid is in liquid condition, at 

a high pressure and tempera

ture.

Type of compressor: SD 7Y15
Compressor oil : PAG SP 10  or SP20, volume –135 cmc.
Refrigerant:  HFC 134 a, quantity of refrigerant : 0.590 kg

COMPRESSOR REPLACEMENT

DISMOUNTING
Disconnect the battery.
Drain the refrigerant circuit.
Disconnect the compressor’s connection.
Disconnect the pipes from the compressor.
Dismount the belt tensioning screw and release the belt.
Dismount the compressor attachment screws.
Dismount the compressor.
Replace the compressor.

REMOUNTING
Perform in the reverse order the dismounting operations.
Tension the belt and tighten at the required moment the tightening attachment screw.
Fill the refrigerant circuit and check the good operation of the climate control system.

COMPRESSOR

AIR CONDITIONING

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THE CONDENSER

The condenser is placed on the cooling radiator, in the front part of the vehicle and is ensuring

the exhaust of the refrigerant heat accumulated at compression.

In order to grant the optimum condenser operation, frequently check if its outside surfaces are

always clean and the air penetration is not stopped. Also, check the condenser pipes in order not
to show deformations.

CONDENSER

CONDENSOR REPLACEMENT

DISMOUNTING
Disconnect the battery.
Drain the cooling circuit.
Dismount the pipes connected to the condenser.
Dismount the radiator-condenser assembly.
Separate the cooling radiator from the condenser.
ATTENTION:
Avoid the possible deformation of the ducts and finned plates.
Replace the condenser.

REMOUNTING
Perform the dismounting operations in  the reverse order.