DescriptionThe climate control via the heater unit is insufficient when the engine is cold, especially in Diesel engines which are slow to warm up.These engines may optionally be fitted with a supplementary heater system. This remains active from the moment when the engine is turned on until a certain temperature is reached.The system consists of an additional heater, located in the heater unit: the device contains three resistances (PTC).The operation of the resistances is controlled by the climate control unit which either operates only one, two or three of them, providing gradual heating, with a maximum power of 700 W following a logic which depends on:the temperature of the engine coolant (about 60° ?);the engine speed (which should be above 700 rpm).the battery voltage (which should not go below 12.2 V). For more details 3022514Characteristic of working principle5040AIR CONDITIONING CASING AND COMPONENTS . The device is controlled by means of two relays; one is located in the engine compartment control unit, the other on the actual heater unit. The supply line is protected by a specific maxifuse, again in the engine bay control unit.
Functional description The relay T8 of the engine compartment junction unit B1 controls the circuit for engaging the first resistance for the additional heater. The relay supply arrives from the line of maxifuse CVM located on the battery, connector B99 , via the line of special fuse F8 of engine bay control unit B1 . The supply for the coil for relay T8 arrives from the line controlled by the ignition (INT/A) protected by fuse F31 of the junction unit under the dashboard B2 . The climate control unit M70 sends the enabling signal for engaging the first resistance O25A from pin 23: this signal energizes relay T8 of control unit B1 . The relay J36 controls the engagement of the other two resistances for the additional heater. The supply for relay arrives from the line for maxifuse PTC2, located on the battery, connector B99 . The climate control unit M70 sends a signal for enabling the engagement of the two resistances O25B and O25C from pin 22: this signal energizes the relay J36 .
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213025802-7040A37fuse box cover - r r1. Disconnect the electrical connections at the front (1a, 1b, 1c,1d, 1e, 1f).2. Undo the bolts fixing the control unit.3. Undo the bolts shown fixing the dashboard cover.2004865
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Ensure that the ignition key is in the OFF position, then disconnectthe negative battery terminal (-).2. Open the maxi fuse box cover.3. Undo the bolts securing the 'maxi-fuse' box to the battery.4. Loosen the bolt fixing the battery terminal (+).5. Release the maxi fuse box from the battery and move it to theside.2004975
5530B14
Follow these precautions:769768768
5530B18
Follow these precautions.769On batteries with an opticam hydrometer,electrolyte level and battery charge status can be monitored qualitativelyby examining the indicator colour: a light, bright colour indicates low electrolytelevel: top up with distilled water;a dark colour without a green area in thecentre indicates that the electrolyte level is correct but chargeis low: recharge the battery; a dark colour with a green area in themiddle indicates that both electrolyte level and charge status arecorrect: no action is necessary. For further details, see DESCRIPTION ANDOPERATION - 5580.768Proceed as follows.Check the battery voltage without loadusing the test device recommended by the Service outlets (e.g. 'MICRO360'). Depending on the voltage values measured,which define the state of charge of the battery, proceed as follows:If the voltage without load is less than12.10 V, replace the battery (see op.). 5530B10).If the voltage without load is over 12.10V but less than 12.50 V, recharge the battery (see op. 5530B14).If the voltage without load is over 12.50V, the battery is efficient.If necessary, top up the electrolyte asfollows.Carefully remove the cap strip.Top up with distilled and deionized water,taking care not to allow electrolyte to splash out.768
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Place the vehicle on a lift.Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b).2004980
5530B40
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b).2004986
5530B52
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Proceed with removal 3025534-5530B10battery - r+r .1. Remove the relay/fuse box cover.2. Undo the nut (2a) and disconnect the earth lead (2b) from therelay-fuse box.2004990
5530B60
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213025534-5530B10battery - r+r1. Remove the battery drip tray.2. Unscrew bolts (2a) and loosen bolt (2b) securing the batterycradle.3. Move the battery cradle aside.4. Release the belt retaining stud.5. Remove the belt.2005002
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Unscrew the motor retaining bolt.2. Disconnect the motor electrical connection.3. Remove the motor (3a) releasing the toothed wheel (3b) from thecam rack.2004835
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Unscrew the motor retaining bolt.2. Disconnect the electrical connections for the motor (2a, 2b,2c, 2d).3. Remove the motor (3a) releasing its connection (3b).2004840
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