PAT


suppliers


aaaa logo

Member of Australian Automotive Aftermarket Association

PRTC Council Member

4WD Council Member



Latest News

Cooling Fan Switches (CFS)

What technicians need to know about cooling fan switches (CFS) and their related wiring circuits (used to control the electric cooling fans) when the system malfunctions.

Note: The CFS is generally a thermatic unit that will activate a fan relay by switching ON at a set coolant temperature and deactivate the fan relay by switching OFF at a slightly cooler temperature to prevent any rapid switching (ON /OFF cycle) of the electric fan/s.

With the variety of engine cooling fan systems available on vehicles typically found in regular automotive repair workshops, the system and components operation of these vehicles require total understanding prior to any diagnosis and/or physical testing.

Typical system variations may be:

  • Single electric fan utilised for Air Conditioning operation only and activated by the compressor clutch circuit. (no CFS required). Note - Mechanical fan used for general Engine cooling.
  • Single electric fan activated by a thermatic CFS only. The CFS controls the fan relay activation at set coolant temperatures.

  • Single electric fan activated by a fan relay and controlled by the PCM and coolant temperature sensor. (No CFS required on this system.)

  • Single electric fan with low speed and high-speed activation controlled by the 3 terminal dual contact CFS. This allows the high-speed fan function to activate when the air conditioning operates or when engine temperature requires it. Generally mounted on the radiator assembly.

Multi Cooling Fans

Multiple cooling fan systems may utilise CFS units as part of the system operation. Many of these vehicle systems may seem complex and require a clear operating wiring diagram to eliminate confusion. Generally, the CFS operates in conjunction with the Air Conditioning system as well as the Coolant Temp Sensor signal sent to the PCM.

Typical Toyota 2002 -2005 V6 Camry fan control system.

There are two fan motors that may operate at low speed or high speed depending on the cooling system temperature. Operating the fan motors in a series circuit will result in low speed operation. Operating the same fan motors in parallel circuit will result in high speed operation.

There are two separate Temp Switches fitted to this vehicle, with number 1 switch located at the lower radiator tank and the number 2 switch located at the front of the cylinder head. When number 2 switch or the A/C module is switched to Ground, the 2 main fans will operate at low speeds. When number 1 switch or the A/C pressure switch internal contacts close, the 2 main fans will switch to full speed.

Testing this system

If the fans do not function:

  • Check both temperature switches operation.
  • Ensure all fan relay units function. – Check power supply to relays.
  • Ensure fuses are not open circuit.
  • Ensure fan motors function. (supply power supply to each fan and inspect).

Note:
Control modules may generally be utilised to control fan motors on later vehicles. Many of the fan controllers rely on Pulse Width Modulation (PWM) to control the variable fan speed. The use of specialised test equipment for these motors can eliminate the unnecessary and expensive fan motor replacement.

The PlusQuip EQP-115 Electronic EGR / Throttle Body And Actuator Tester is a suitable tester used to drive all PWM controlled actuators/motors.

The Premier Auto Trade Sensor range includes almost 90 Cooling Fan Switches (CFS) from the world’s leading manufacturers, covering almost 2 million vehicle applications in Australia and NZ.

When you supply and fit products from Premier Auto Trade you can expect a product designed and tested to the vehicle manufacturer’s specifications offering OE form, fit and function. Premier Auto Trade distributes products throughout Australia via a network of specialised resellers and leading automotive groups.



Latest News

Cooling Fan Switches (CFS)

Water Temperature Sensors (WTS)

Reverse Light Switches

Oil Temperature Sensors (OTS)

BMC Air Filters

Flasher Cans

Exhaust Pressure Sensors (EPS)

Power Steering Switches

Coolant Temperature Sensors (CTS)

Variable Intake Manifolds (VIM) and Intake Control Valves (ICV)

Oil Level Sensors (OLS)

Throttle Position Sensors (TPS)

Air Temperature Sensors (ATS)

Ignition – Condensers, Contact Sets, Distributor Caps and Rotors

Fuel System Accessories (FSA)

MAP Sensors (MAP)

Relays (REL)

HALL Sensors and Pickups (HAL)

Fuel Rail Sensors (FRS)

Speed Sensors (SPS)

New ICON Series Fuel Pump Range

New ICON Series Hose Range

Performance Range Increase Continues

PAT Oxygen Sensor Range Expands

PAT Expands Automotive Aftermarket Presence

Equipment and Tools

Electric Fuel Pumps (EFP)

Electric Valve Solenoids (EVS)

CAM Angle Sensors (CAM)

Ignition Modules (MOD)

Injector Service Components

Electric Water Pumps (EWP)

Exhaust Gas Temperature Sensors (EGT)

Throttle Bodies

Knock Sensors

Ignition Coils

Fuel Injectors (Petrol)

Variable Camshaft Actuators (VCA) Oil control Valves

Accelerator Pedal Position Sensors (APPS)

Exhaust Gas Recirculation Valves (EGR)

Relocation of Sydney Distribution Centre

Wheel Speed Sensors (WSS)

High Tension - Ignition Lead Sets (ILS)

Suction Control Valves (SCV)

Mass Air Flow (MAF) Sensors

Crank Angle Sensors (CAS)

Fuel Pressure Regulators (FPR)

Oil Pressure Sensors

Exhaust Gas Oxygen Sensors

Shedding Light on Stop Light Switches

Ignition Distributors

Common Rail Diesel (CRD) Fuel Injectors

Idle Speed Control

New Distribution Centre Opening in ADELAIDE

New Distribution Centres Opening in PERTH and DARWIN

New Fuel Catalogue from Premier Auto Trade

BMC 4WD Air Filters Range Expands

New MVP Fuel Injector Range

PAT Developing Programs on Demand

New Premium Packaging for PAT

New Product Ranges Released By PAT

PlusQuip Test Equipment Range Expands

New Raceworks Catalogue

New Exhaust Gas Temperature Sensors

New Trade Catalogues from Premier Auto Trade

New Distribution Centre Opening in Adelaide

More European Parts from Premier Auto Trade

New PlusQuip Fuse Current Tester

PAT Pumped up!

Coils ain't Coils!

New PlusQuip Electronic EGR, Throttle Body, and Actuator Tester

New breed of High Performance products!

New Ignition Coil and Lead Set Kits

Wheel Speed Sensor Program Launched

Premier Ignition Lead Program Launch

Ignition Coils - Coils ain't Coils!

PlusQuip Battery Testers Launch

Premier Auto Trade Supporting Local Racing

Oval Trumpet Airbox (OTA) for 4WD applications from BMC Air Filters

BMC Air Filters NOW AVAILABLE from Premier Auto Trade

Premier Ignition Coils

MAP-013 and KNS-021 Now Back in Stock

BMC Air Filter partners with Premier Auto Trade

Premier Auto Trade opens South Australian Distribution Centre

Direct Fit Oxygen Sensor Range Hits 700

Automotive Electro-Mechanical Relays Types / Faults / Diagnosis

PlusQuip Tools and Equipment Launch

PlusQuip Fuel Line Repair Kit

PlusQuip Fuel Injector Service Kit

E85 High Performance with Premier Auto Trade

Testing EGR Systems (Pt 2)

New Delphi Fuel Module and Ignition Coil Range

Fuel Injector Service Components from Premier Auto Trade

Older News...

   privacy statement   terms of use   terms and conditions   sitemap   news  

© PremierAutoTrade