Electrical System

COOLING SYSTEM – Thermo fan switch

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PURPOSE

The thermo fan switch when it reaches its designed temperature is designed to switch on and when it reaches a lower temperature, it is designed to switch the power off.  The thermo fan switch receives power from the fuse box.  When it reaches a temperature the switch will bridge the terminals thus turning the thermo fan on.

 

THINGS TO LOOK FOR

Check that the connections are secure and observe that the thermo fan is switching on and off.  Sometimes this may not ...

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COOLING SYSTEM – Thermo fan relay

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PURPOSE
The thermo relay is a heavy duty switch to prevent the request switch from overloading with excessive current or heat. 

THINGS TO LOOK FOR
As the thermo fan operates over years the internal mechanisms may start to wear and cause a resistance in the thermo fan relay causing an overload on to the relay and the fuse.  A common sign is a faulty relay.  Melted terminals on the relay indicate that the thermo fan may be overloading the system or ...

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THE NOISE – Thermo fan switching on

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THE EFFECT
The cooling system will maintain normal operating temperature under all driveable conditions. 

THINGS TO LOOK FOR
It’s always a good idea to look at the thermostatic fan to understand how it operates.  Because thermostatic fans are thermostatically controlled and they should switch on and off.  A good thermostatic fan in a very good cooling system will switch on for somewhere between 20-40 seconds.  If the fan switches on for longer than 60 seconds this might be a cooling system ...

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ELECTRICAL SYSTEM – Starter motor relay

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PURPOSE
The starter motor relay is designed to switch a 12 volt power supply from the ignition to the starter motor solenoid.  The starter motor relay may also be fitted to an older vehicle with a possible voltage loss on this 12 volt supply.  A starter motor relay is a high current switch that may malfunction after 5-10 years in operation.

THINGS TO LOOK FOR
A starter motor relay if fitted as an after market item may malfunction if the wiring ...

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