Cooling Fan Relay
Switches the heavy current the cooling fans draw. Worth testing before the fan motor on any fan complaint — it is far cheaper and fails more often, and a fan that does not run says nothing on its own about which of the two is at fault. Contacts that weld closed produce the opposite symptom, a fan that runs constantly and flattens the battery.
Also known as: fan relay, radiator fan relay, cooling fan control relay
Referenced by 28 codes
Codes involving this component (28)
- P0480 Cooling Fan 1 Control Circuit High
- P0485 Cooling Fan Power/Ground Circuit High
- P0494 Fan 1 Underspeed High
- P0691 Cooling Fan 1 Control Circuit Low High
- P0692 Cooling Fan 1 Control Circuit High High
- P2B2F Fan 1 Performance/Stuck Off High
- U0077 Control Module Communication Bus E Off High
- P0481 Cooling Fan 2 Control Circuit Moderate
- P0482 Cooling Fan 3 Control Circuit Moderate
- P0484 Fan Circuit Current High Moderate
- P0493 Cooling Fan Overspeed Moderate
- P0526 Fan Speed Sensor Circuit Moderate
- P0528 Fan Speed Sensor Circuit No Signal Moderate
- P0693 Cooling Fan 2 Control Circuit Low Moderate
- P0694 Cooling Fan 2 Control Circuit High Moderate
- P0695 Cooling Fan 3 Control Circuit Low Moderate
- P0696 Cooling Fan 3 Control Circuit High Moderate
- P2184 Engine Coolant Temperature Sensor 2 Circuit Low Moderate
- P2518 Air Conditioning Refrigerant Pressure Sensor B Circuit High Moderate
- P028A Charge Air Cooler Cooling Fan Control Circuit/Open
- P028C Charge Air Cooler Cooling Fan Stuck On
- P028D Charge Air Cooler Cooling Fan Control Circuit Low
- P028E Charge Air Cooler Cooling Fan Control Circuit High
- P028F Charge Air Cooler Cooling Fan Control Circuit Driver Performance
- P0495 Fan 1 Overspeed Low
Other components in Electrical and Charging
- Data Bus 563
- Battery 218
- Gateway Module 158
- Stability Control Module 122
- Battery Temperature Sensor 115
- Infotainment Head Unit 49
- Alternator 45
- Brake Booster Pressure Sensor 39
- A/C Refrigerant Pressure Sensor 33
- Brake Light Switch 32
- Cruise Control Switch 31
- Ignition Switch 31
- Starter Relay 25
- A/C Compressor 25
- Clutch Switch 24
- ECM Power Relay 21
- Roof Antenna Module 19
- Immobiliser 15
- Lighting Driver Control Module 15
- Starter Motor 14
- Transmission Control Module Power Relay 14
- Fuel Pump Relay 13
- Secondary Air Injection Relay 13
- Battery Monitoring Sensor 10
- Driver Information Centre 10
- A/C Evaporator Temperature Sensor 8
- Telematics Control Module 8
- Navigation Control Module 6
- Headlamp Levelling Actuator 6
- Hydraulic Pump Relay 5
- Head-Up Display 2
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Working on this component
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about Cooling Fan Relay.