2010.5 Citroen DS4 cooling

When the engine is running or the vehicle is being driven, the illumination of one of the following warning lamps indicates a fault which requires action on the par t of the driver. The warning comes on in the instrument panel or appears in the central colour screen associated with the satellite navigation system.
If your vehicle has a screen, a warning lamp coming on is always accompanied by the display of an additional message, to assist you in identifying the problem. If you encounter any problems, do not hesitate to co ntact a CITROËN dealer or a qualified workshop.
Warning lampis onCauseAction/Obser vations
STOP fixed, alone or associated with another warning lamp, accompanied by an audible signal and a message in the screen.
Illumination of this warning lamp is associated with a serious braking system, power steering, engine lubrication or cooling system fault or a punctured tyre.
Stop as soon as it is safe to do so as there is a risk that the engine will cut out while driving. Park, switch off the ignition and contact a CITROËN dealer or a qualified workshop.
Maximum coolant temperature fixed red. The temperature of the cooling system is too high. Stop as soon as it is safe to do so. Wait until the engine has cooled down before toppin g up the level, if necessary. If the problem persists, contact a CITROËN dealer or
qualified workshop.
Engine oil pressure fixed. There is a fault with the engine lubrication system. You must stop as soon it is safe to do so. Park, switch off the ignition and contact a CITROËN dealer or a qualified workshop.

Ventilation
Air intake
The air circulating in the passenger compartment is filtered and originates either from the outside via the grille located at the base of the windscreen or from the inside in air recirculation mode.
Air treatment
The incoming air follows various routes depending on the controls selected by the driver: - direct arrival in the passenger compar tment (air intake), - passage through a heating circuit (heating), - passage through a cooling circuit (air conditioning).
Control panel
The controls of this system are grouped together on control panel A on the centre console.
Air distribution
1. Windscreen demisting-defrosting vents. 2. Front side window demisting-defrosting vents. 3. Side adjustable air vents.
4. Central adjustable air vents. 5. Air outlets to the front footwells. 6. Air nozzles to the front footwells. 7. Air outlets to the rear footwells.

81Comfort
2. Driver's side adjustment 4. Automatic visibility programme
For maximum cooling or heating of the passenger compar tment, it is possible to exceed the minimum value 14 or the maximum value 28.  Turn control 2 or 3 to the left until
"LO" is displayed or to the right until "HI" is displayed.
See "Front demisting - defrosting". 3. Passenger's side adjustment
The driver and front passenger can each adjust the temperature to their requirements. The value indicated on the display corresponds to a level of comfor t and not to a temperature in degrees Celsius or Fahrenheit.
 Turn control 2 or 3 to the left or to the right respectively to decrease or increase
this value.
A setting around the value 21 provides optimum comfort. However, depending on your requirements, a setting between 18 and 24 is normal. You are advised to avoid a left/right setting difference of more than 3.
Manual operation
If you wish, you can make a different choice from that offered by the system by changing a setting. The the "AUTO" indicator lamps go off; the other functions will still be controlled automatically.  Pressing the "AUTO" button returns the system to completely automatic operation.
With Stop & Star t, when demisting has been activated, the STOP mode is not available.

Changing the coolant
The coolant does not have to be changed.
Coolant specifi cation
The coolant must conform to the manufacturer's recommendations.
Coolant level
The coolant level should be close to the "MA X" mark but should never exceed it. When the engine is warm, the temperature of the coolant is regulated by the fan. This can operate with the ignition off. On vehicles which are fitted with a par ticle
emission filter, the fan may operate after the vehicle has been switched off, even if the engine is cold.
In addition, as the cooling system is pressurised, wait at least one hour after switching off the engine before carrying out any work. To avoid any risk of scalding, unscrew the cap by two turns to allow the pressure to drop. When the pressure has dropped, remove the cap and top up the level.
Power steering fluid level
The power steering fluid level should be close to the "MA X" mark. Unscrew the cap, with the engine cold, to check the level.
To check the level or top up the fluid, immobilise the vehicle and switch of the engine.
Screenwash/headlamp
wash level

267Practical information
Changing a wiper blade
Before removing a front
wiper blade
 Within one minute after switching off the ignition, operate the wiper stalk to position the wiper blades ver tically on the windscreen.
Removing
 Raise the corresponding wiper arm.  Unclip the wiper blade and remove it.
Fitting
 Put the corresponding new wiper blade in place and clip it.  Fold down the wiper arm carefully.
After fitting a front wiper
blade
 Switch on the ignition.  Operate the wiper stalk again to park the wiper blades.
Very cold climate screen * Removable protective screen which prevents the accumulation of snow at the radiator cooling fan.
Fitting
 Offer up the very cold climate screen to the front of the lower section of the front bumper.  Press around its edge to engage its fixing clips one by one.
Removal
 Use a screwdriver as a lever to release each fixing clip in turn.
* According to country.
Do not forget to remove the very cold
climate screen: - when the ambient temperature exceeds 10 °C, - when towing, - at speeds above 75 mph (120 km/h).

271Practical information
The rear parking sensors will be deactivated automatically if a genuine
CITROËN towbar is used.
Driving advice
Distribution of loads
 Distribute the load in the trailer so that the heaviest items are as close as possible to the axle and the nose weight approaches the maximum permitted without exceeding it. Air density decreases with altitude, thus reducing engine per formance. Above 1 000 metres, the maximum towed load must be reduced by 10 % for every 1 000 metres of altitude. Refer to the "Technical Data" section for details of the weights and towed loads which apply to your vehicle.
Side wind
 Take into account the increased sensitivity to side wind.
Cooling
Towing a trailer on a slope increases the temperature of the coolant. As the fan is electrically controlled, its cooling capacity is not dependent on the engine speed.  To lower the engine speed, reduce your speed. The maximum towed load on a long incline depends on the gradient and the ambient temperature. In all cases, keep a check on the coolant temperature.
Braking
Towing a trailer increases the braking distance.
Tyres
 Check the tyre pressures of the towing vehicle and of the trailer, obser ving the recommended pressures.
Lighting
 Check the electrical lighting and signalling on the trailer.
 If the warning lamp and the STOP warning lamp come on, stop the vehicle and switch off
the engine as soon as possible.