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#Post#: 62547--------------------------------------------------
Fan Switch
DIR By: ashcrroft752
Date: May 27, 2013, 10:47 pm
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I need to wire and plumb an automatic switch for my electic fan
in to my cooling system, should the adaptor be plumbed into the
top or bottom hose?
What temprature range on off would I need for a 200tdi? On at 95
off at 86 degrees or on at 88 off at 79 degrees?
#Post#: 62551--------------------------------------------------
Re: Fan Switch
DIR By: Bert the Bodger
Date: May 28, 2013, 1:41 am
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Aftermarket fan sensors usually go into the top hose. Donors
follow the donor pattern.
Richard
#Post#: 62558--------------------------------------------------
Re: Fan Switch
DIR By: Flatcap
Date: May 28, 2013, 3:24 am
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Funny you should post this as I have today fitted a lekky fan to
my 200tdi S3 :smile1 Have to complete the wiring too but on my
engine there is a fan switch built in to the thermostat housing
which makes life a bit easier.Dont know what years had them
though!
#Post#: 62559--------------------------------------------------
Re: Fan Switch
DIR By: RMS
Date: May 28, 2013, 3:27 am
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I've done both on different transplants.
The theory is that if you lose water, a sensor in the top hose
can be uncovered and not detect the temperature.
The same thing happens to the temperature gauge sensor, if it
gets uncovered by the water level falling, it reads cold, so if
you missed seeing the needle shoot up to the red you wouldn't
know you'd lost your water :eek:
However, it is more difficult to fit it into the bottom hose -
you'd have to drain the rad for one thing - and so most
aftermarket fan sensors are fitted in the top hose.
Saying that, if you also fit a bright red warning lamp in full
view on your dash for when the fan is on you should see when it
comes on and it will remind you to keep an eye on the gauge
:thumbs:
HTH,
Robin.
#Post#: 62562--------------------------------------------------
Re: Fan Switch
DIR By: NoelC
Date: May 28, 2013, 4:40 am
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--- Quote from: RMS link ---
>
> The theory is that if you lose water, a sensor in the top hose
can be uncovered and not detect the temperature.
>
--- End Quote ---
It's more than a theory from where I'm sitting Robin, we lost an
MAN engine in one of our buses for exactly that reason. The boss
swore the driver kept going with a red light on but the CCTV
showed he hadn't, and the gauge wasn't showing hot. Personally I
think if you're going to fit one gauge only the MOD had the
right idea - oil temp rather than water temp.
#Post#: 62571--------------------------------------------------
Re: Fan Switch
DIR By: Bert the Bodger
Date: May 28, 2013, 5:53 am
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Isn't it also the case that top hose switches activate at a
higher temperature than bottom hose fitments?
Richard
#Post#: 62575--------------------------------------------------
Re: Fan Switch
DIR By: Mr.Pickles
Date: May 28, 2013, 6:34 am
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There is a electronic fan control, made by Kenlowe, that is
fitted in the core of the radiator, so you can put it at the
bottom and adjust it to suit!
I have one on Pickles as I managed to squash the capillary tube
on the original thermostat!
I also have a Light fitted for when the fan is on, together with
an On/Off/On switch for Auto via stat, off for wading and
permanently on!
Mr.P (Paul)
#Post#: 62577--------------------------------------------------
Re: Fan Switch
DIR By: RMS
Date: May 28, 2013, 6:42 am
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--- Quote from: Bert the Bodger link ---
>
> Isn't it also the case that top hose switches activate at a
higher temperature than bottom hose fitments?
>
> Richard
>
--- End Quote ---
Yes, but most of the aftermarket fans (Kenlowe & clones) have an
adjustable thermostat.
In the vehicles where I've put the sensor in the top hose I
usually set it at around 90C.
In the bottom hose, I set it at around 75-80C.
No idea if those figures are correct - all I know is that in one
where the sensor is in the top (Carawagon with 200TDi), driving
in the soft sand of the Sahara at 40C, the fan was on and off
regularly as expected as the needle hovered just below the red,
but very rarely comes on during normal road use.
On the Carawagon I've been driving over this last year the
sensor is in the bottom hose and only comes on when I have a
fully laden car trailer (loaded with a 200 or 300TDi donor
vehicle :rolleye0012:) and pulling up long hills, so I think
those settings are about right :thumbs:
Cheers,
Robin.
#Post#: 62594--------------------------------------------------
Re: Fan Switch
DIR By: NUGGETT
Date: May 28, 2013, 9:38 am
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the great thing about the adjustable thermostat is you can run
the engine up hot , see where you want to fan fan to come on at
via the dash gauge and hop out and adjust the control knob till
the fan comes on.
Got mine from CBS but it isn't much different in set and price
than the Kenlowe unit.
[URL=
HTML http://s257.photobucket.com/user/NIAB_02/media/IMAG0632_zpsb404e692.jpg.html][IMG]http://i257.photobucket.com/albums/hh235/NIAB_02/IMAG0632_zpsb404e692.jpg[/img][/URL]
[URL=
HTML http://s257.photobucket.com/user/NIAB_02/media/IMAG0634_zpsf6abce28.jpg.html][IMG]http://i257.photobucket.com/albums/hh235/NIAB_02/IMAG0634_zpsf6abce28.jpg[/img][/URL]
Actually moved the unit next to the puke tank now that the
vaccum bottle has been removed.
#Post#: 62610--------------------------------------------------
Re: Fan Switch
DIR By: chally2
Date: May 28, 2013, 11:47 am
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--- Quote from: Mr.Pickles link ---
>
> There is a electronic fan control, made by Kenlowe, that is
fitted in the core of the radiator, so you can put it at the
bottom and adjust it to suit!
>
> I have one on Pickles as I managed to squash the capillary
tube on the original thermostat!
>
> I also have a Light fitted for when the fan is on, together
with an On/Off/On switch for Auto via stat, off for wading and
permanently on!
>
> Mr.P (Paul)
>
--- End Quote ---
--- Quote from: Mr.Pickles link ---
>
> There is a electronic fan control, made by Kenlowe, that is
fitted in the core of the radiator, so you can put it at the
bottom and adjust it to suit!
>
> I have one on Pickles as I managed to squash the capillary
tube on the original thermostat!
>
> I also have a Light fitted for when the fan is on, together
with an On/Off/On switch for Auto via stat, off for wading and
permanently on!
>
> Mr.P (Paul)
>
--- End Quote ---
I have this new Kenlow set up. Did you use one of the original
wires for manual ON. I'm not sure I I can use one of the spare
wires or wire up a separate one. I also want a light to tell me
when it's on. How did you wire that up. Was it from the relay?
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