2014 Citroen DS5 HYBRID4 cooling

45Hybrid system
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Air conditioning
QuestionAnswer
It seems to me that the vehicle runs less on electric when the heating or air conditioning is operating, is that right?
The demand for heating or air conditioning may require the starting of the Diesel engine until the desired level of comfort is attained. Normal hybrid operation is simply put back. The period can be longer under low or very high ambient temperatures.
It seems to me that when it is very hot and the air conditioning is working, the vehicle runs on electric for shorter periods. Is that right?
When it is hot, the periods when the Diesel engine is put on standby and the vehicle runs on electric are necessarily restricted in order to limit the difference between the temperature in the vehicle and the level of comfort selected. In very hot weather, it is always possible to press the Eco OFF button (which brings the vehicle out of ZEV mode and prevents electric running or the stopping of the engine) to give preference to temperature control (keeps the air conditioning running).
Special Hybrid4 features
QuestionAnswer
Can I tow with my hybrid vehicle and how much? A Hybrid4 vehicle can tow between 500 kg and 800 kg (see the "Towing" section). This allows a jet ski or two-wheeler on a trailer to be towed, for example. The "technical" reason for the limit is related to maintaining adequate cooling capacity for the internal combustion engine as well as the hybrid components that are also cooled by the engine's cooling system.
Why does engine braking seem so strong? When you take your foot off the accelerator, the engine braking results mainly from the energy recovery by the electric motor. This leads to a higher level of deceleration than a conventional vehicle and so allows the recovery of free energy.

51Hybrid system
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This system does not work continuously, but adapts the force of the fan cooling to the requirements of the battery. Its operation can be heard at the rear, even if the vehicle is stopped after a run. If the air intake is blocked, the battery may overheat, damaging the battery and causing a loss of per formance of the hybrid system.

Fan cooling of the high voltage battery
For the best use of the high voltage battery, please follow these recommendations: - do not obstruct the air intake with loose articles, otherwise, the battery may overheat, causing a loss of per formance of the hybrid system - do not spill fluids, as this may cause damage to the battery.
The high voltage battery has an air cooling system, comprising an air intake (located on the side of the left hand rear seat) and a fan (located behind the left hand boot trim panel).

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Coolant temperature
gauge
With the hybrid system active: - in zone A , the temperature is correct, - in zone B , the temperature is too high; the central STOP warning lamp comes on, accompanied by an audible signal and a message in the instrument panel screen. You must stop as soon as it is safe to do so. Wait a few minutes before switching off the engine. Contact a CITROËN dealer or a qualified workshop.
After driving for a few minutes, the temperature and pressure in the cooling system increase. To top up the level:  wait for the engine to cool,  unscrew the cap by two turns to allow the pressure to drop,  when the pressure has dropped, remove the cap,  top up the level to the "MA X" mark.
Be aware of the risk of burns when topping up the cooling system. Do not fill above the maximum level (indicated on the reservoir).

11 3Comfort
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These have one position for use (up) and a stowed position (down). They can also be removed. To remove a head restraint:  release the backrest using control 1 ,  tilt the backrest 2 slightly for wards,  pull the head restraint upwards to the stop,  then, press the lug A .
Rear head restraints
Never drive with the head restraints removed; they must be in place and correctly adjusted.
Fan cooling of the high voltage battery
This system does not work continuously, but adapts the force of the fan cooling to the requirements of the battery. Its operation can be heard at the rear, even if the vehicle is stopped after a run. If the air intake is blocked, the battery may overheat, damaging the battery and causing a loss of per formance of the hybrid system.
For the best use of the high voltage battery, please follow these recommendations: - do not obstruct the air intake with loose articles, otherwise, the battery may overheat, causing a loss of per formance of the hybrid system - do not spill fluids, as this may cause damage to the battery.
The high voltage battery has an air cooling system, comprising an air intake (located on the side of the left hand rear seat) and a fan (located behind the left hand boot trim panel).

125Comfort
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4. Automatic visibility programme
For maximum cooling or heating of the passenger compartment, 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".
2-3. Driver's-passenger's side settings
The driver and front passenger can each adjust the temperature to their requirements. The value indicated on the display corresponds to a level of comfort 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 "AUTO" indicator lamps go off; the other functions, except the air conditioning, will still be controlled automatically.  Pressing the "AUTO" button returns the system to completely automatic operation.
With Stop & Start, when demisting has been switched on, the Diesel engine does not stop.

245Practical information
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We recommend the use of genuine CITROËN towbars and their harnesses that have been tested and approved from the design stage of your vehicle, and that the fitting of the towbar is
entrusted to a CITROËN dealer or a qualified workshop. If the towbar is not fitted by a CITROËN dealer, it is imperative that it is fitted in accordance with the vehicle manufacturer's instructions.
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 performance. Above 1 000 metres, the maximum towed load must be reduced by 10 % for every 1 000 metres of altitude.
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.
 If the warning lamp and the STOP warning lamp come on, stop the vehicle and switch off the engine as soon as possible.
Braking
Towing a trailer increases the braking distance. To avoid overheating of the brakes on a long mountain type of descent, the use of engine braking is recommended.
Ty r e s
 Check the tyre pressures of the towing vehicle and of the trailer, observing the recommended pressures.
Lighting
 Check the electrical lighting and signalling on the trailer.
The rear parking sensors will be deactivated automatically if a genuine CITROËN towbar is used.
Driving with a trailer places greater demands on the towing vehicle and the driver must take particular care.
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.
Refer to the "Technical data" section for details of the weights and towed loads which apply to your vehicle.

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Checking levels
Take care when working under the bonnet, as certain areas of the engine may be extremely hot (risk of burns) and the cooling fan could start at any time (even with the ignition off).
Engine oil level
The check is carried out either when the ignition is switched on using the oil level indicator in the instrument panel for vehicles with and electric oil level gauge, or using the dipstick.
To ensure that the reading is correct, your vehicle must be parked on a level sur face and the engine having been off for more than 30 minutes.
Check all of these levels regularly, in line with the maintenance and warranty guide. Top them up if necessary, unless other wise indicated. If a level drops significantly, have the corresponding system checked by a CITROËN dealer or a qualified workshop.
Before doing anything under the bonnet, switch off the ignition ( Readylamp off) to avoid any risk of injury resulting from automatic operation of the engine.
It is normal to top up the oil level between two services (or oil changes). CITROËN recommends that you check the level, and top up if necessary, every 3 000 miles (5 000 kms).
Checking using the dipstick
Refer to the "Diesel engine" section for the location of the dipstick in the engine compartment of your vehicle.
 Take the dipstick by its coloured grip and remove it completely.  Wipe the end of the dipstick using a clean non-fluffy cloth.  Refit the dipstick and push fully down, then pull it out again to make the visual check: the correct level is between the marks Aand B .

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Before doing anything under the bonnet, switch off the ignition ( Readylamp off) to avoid any risk of injury resulting from automatic operation of the engine.
The brake fluid level should be close to the "MA X" mark. If it is not, check the brake pad wear.
Brake fluid level
Changing the fl uid
Refer to the maintenance and warranty guide for details of the interval for this operation.
Fluid specifi cation
The brake fluid must conform to the manufacturer's recommendations.
The power steering fluid level should be close to the "MA X" mark. With the engine cold, unscrew the cap to check the level.
Power steering fluid level
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.
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.
Fluid specifi cation
The coolant must conform to the manufacturer's recommendations.
The cooling fan may star t after switching off the engine: take care with ar ticles and clothing that might become caught by the fan blades.