Citroen C5 Aircross Quiz
Cooling

Coolant temperature regulation

In this manual: Cooling
AAS - Parking Aid — 8Owner's Manual Citroën C5 II — 139Citroen C5 Aircross (2017- 2024) - Owner's Manual — 143Audio system — 14Overspeed control — 7Multifunction display — 4Driver information instrument cluster — 20Navigation assistance — 8Intruder alarm — 7Mechanical specifications — 9Power supply — 8Electrical equipment — 13Lighting and electrical equipment — 3Immobiliser — 4Sunroof — 10Exterior lighting / signalling — 38Multiplexing — 7Air conditioning — 7Body — 6General specifications — 9Automatic gearbox control — 3Exterior mirrors — 10Airbags — 5Defrost — 6Underinflation — 6Interior lighting — 4Wipers / Washers — 6Window lifters — 11Cooling — 8Opening management — 7Cruise control — 5Suspension — 4Grip management — 1Paint — 2Exterior lighting control — 1Indicators (turn signals) — 1Automatic lighting systems - General recommendations — 1Wiper control — 1Special position of the front wipers — 1
~2min read

Principle

Coolant temperature regulation is stepped. Three temperature ranges allow the Cooling Fan Unit to run at low speed, medium speed or high speed.

The temperature sensor, located on the coolant outlet housing, informs the Engine Control Module of the engine coolant temperature.

Block diagram

Regulation par rapport A la temperature d’eau
Coolant temperature regulation

Key:

  • single arrow: wired link,
  • triple arrow: multiplexed link.
Description fonctionnelle

Functional description

STEP

DETAILS
1 The Engine Control Module receives the engine coolant temperature sensor signal via a wired link.
The Engine Control Module transmits the engine coolant temperature and engine coolant temperature warning information on the CAN network.
2 If the temperature is between 94 and 97°.

the Engine Control Module commands low speed to the Cooling Fan Unit.
If the temperature is between 98 and 101°.

the BSI commands medium speed to the Cooling Fan Unit.
If the temperature is between 102 and 105°.

the Engine Control Module commands high speed to the Cooling Fan Unit.
3 The BSI broadcasts the engine coolant temperature information via the VAN CONFORT network.
The BSI transmits the engine coolant temperature warning information to the instrument cluster and the Multifunction display via the VAN CONFORT network.

Engine coolant temperature warning

Alerte de température d’eau moteur

Degraded mode

A fault in the engine coolant temperature sensor causes the following actions:

  • Cooling Fan Unit operates at high speed,
  • air conditioning compressor switched off,
  • STOP warning light and engine coolant temperature warning light illuminate on the instrument cluster (depending on version),
  • a message is displayed on the Multifunction display,
  • a fault is recorded in the Engine Control Module.

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