2010.5 Citroen DS4 engine coolant

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.

227Checks
Petrol engines
The various caps and covers allow access for checking the levels of the various fluids and for replacing cer tain components.
1. Power steering reser voir. 2. Screenwash and headlamp wash reser voir. 3. Coolant reser voir. 4. Brake fluid reser voir. 5. Battery/Fuses. 6. Fusebox. 7. Air filter. 8. Engine oil dipstick. 9. Engine oil filler cap.

Diesel engines
The various caps and covers allow access for checking the levels of the various fluids, for replacing cer tain components and for priming the fuel system.
1. Power steering reser voir. 2. Screenwash and headlamp wash reser voir. 3. Coolant reser voir. 4. Brake fluid reser voir. 5. Battery/Fuses. 6. Fusebox. 7. Air filter. 8. Engine oil dipstick. 9. Engine oil filler cap. 10. Priming pump * . 11. Bleed screw * .
* According to engine.

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

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.