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How to test your fan switch
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 Post subject: How to test your fan switch
PostPosted: Mon Feb 23, 2009 10:07 pm 
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Joined: Tue Aug 19, 2008 7:04 pm
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Location: Derby
Many RF owners query the lack of action from the radiator cooling fan. In my experience it operates very rarely, only in very hot weather (we wish) or when stuck in crawling traffic à la Reading Toy Run. I think this is a testament to the design of the engine and cooling system - both liquid and passing air - that high temps are rarely reached.

The switch is of the 'normally open' kind and is supplied via the wiring to the fan motor. That is to say the fan motor is always 'live' but until the switch closes there's no path to earth so the fan doesn't run.

The switch should close at around 105 degrees C bringing the fan in. When the temperature of the coolant drops to about 100 degrees C the switch opens again shutting off the fan.


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If you want to test the operation of the switch there's two ways ......

To be really accurate you need to immerse the switch in a pan of oil and heat that to 105 degrees. A multimeter set to Ohms across the switch wiring will show Infinity when the switch is open but drop to a low Ohms reading when it closes. You'd need to insert a thermometer in the oil to check the actual operating temp. You need to use oil because water boils at 100 degrees so won't get hot enough to operate the switch.

An easier way would be to unscrew the switch from the thermostat housing and play a lit cigarette lighter across the business end - the fan should start.

To check the fan only just unplug the wiring connector 'A' in the diagram and short the two wires (Red/Black and Black/White) together at the wiring harness side of the connector - the fan should run.


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How to test your fan switch
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 Post subject: Re: How to test your fan switch
PostPosted: Tue Feb 24, 2009 10:31 pm 

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Top advice FF thanks


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How to test your fan switch
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 Post subject: Re: How to test your fan switch
PostPosted: Mon Mar 02, 2009 8:44 pm 

Posts: 4706
more great advice on the 'PREMIER' RF site!!!! :mrgreen:

:mrgreen:


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How to test your fan switch
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 Post subject: Re: How to test your fan switch
PostPosted: Mon Mar 02, 2009 8:58 pm 
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Joined: Tue Aug 19, 2008 7:04 pm
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Location: Derby
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This might be an easier way to show what I mean about 'shorting' across the switch wiring - just use any length of insulated wire with 1/4" bared at each end and poke it into the socket .....

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