BenB
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| posted on 22/11/06 at 10:46 AM |
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Relay on fan switch
Morning all....
I was suspecting that my fan wasn't coming on (my temp rose quite high after getting stuck in traffic immediately after a blat and took quite a
time to come down again)....
I ran up the engine back in the garage and infact it is coming on but it's got me thinking...
I'm using a Polo radiator with the fan switch being activated from the Polo rad switch. Can these be used without a relay? They're pretty
chunky (presumably a bimetalic switch), so I'm assuming no relay needed... Does anyone bother??? I know its not causing a problem at the moment,
but the thought of it dying and needing replacing (IE requiring re-filling the cooling system) is not particularly tempting...
I'm using a Honda Blackbird fan BTW. though I suspect the Ampage of fans is reasonably similar...
Thanks in advance!
Ben
[Edited on 22/11/06 by BenB]
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Howlor
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| posted on 22/11/06 at 11:09 AM |
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Ive wired mine through a time delay switch (10mins) as used on rear screen heaters. The switch on the dash is a momentary unit that is wired to light
up when the fan is running either by manual over ride or with the switch in the rad.
This way I can monitor the fan and I will never leave it on.
Steve
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nick205
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| posted on 22/11/06 at 11:21 AM |
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I'm using the same rad and switch, I don't think the Polo switch needs a relay (suspect it doesn't have one in the Polo). I have
mine wired through a relay though as I also have a manual overide switch on the dash so I can get better control over the fan.
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BenB
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| posted on 22/11/06 at 11:49 AM |
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Gr8... I think I'll leave it alone. If it burns out or arcs I'll change it for a new one...
I should probably change the coolant relatively frequently to begin with just to flush out any sedimented cr@p from the bottom of the engine etc...
Its amazing how much crud can accumulate. I put a hose from the pressure overflow on the header tank to the floor of the engine bay after seeing Ian @
STM fire up his ST1100 for the first time (shiny new engine off a police motorbike- rider fell of after < 200 miles!!). It got up the temp then
dredged up a load of sedimented blue crud from the block and farted it out of the header tank outlet all over the engine.... Whoops...
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CairB
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| posted on 22/11/06 at 12:46 PM |
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Have you seen cost of the 12v 40A Maplins
relay ?
Cheaper than a new temperature switch.
Cheers,
Colin
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BenB
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| posted on 22/11/06 at 12:53 PM |
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I've even got a suitable relay sitting in the box'o'bits somewhere. Just plain lazy 
I'll see if I get sleepless nights worrying about it!!! Probably will!! Don't want to be left without a fan!!
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chriscook
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| posted on 22/11/06 at 06:06 PM |
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I've got mine switching through the switch and its been fine so far. I also have a manual override which activates through a relay and also so I
can have it controlled by the ECU if i want when I go to injection.
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