steve8274
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| posted on 25/4/14 at 05:17 PM |
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Additional fan switch wiring
Hello all
I am considering putting a switch in my car for the fan. At the moment, it operates via a fan switch in thermostat housing.
Is there a way to have the fan come on with thermostat switch and switch in car?
What type of switch would I need and could someone say or draw how to wire it?
Thanks in advance
Steve
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omega 24 v6
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| posted on 25/4/14 at 05:26 PM |
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Just connect them ( the switches) in Parallel. this will work if its direct control from the fan switch OR from a fan relay. If its direct them make
sure you use a switch capable of taking the current required.
If it looks wrong it probably is wrong.
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steve8274
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| posted on 25/4/14 at 08:29 PM |
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Thanks for the reply.
However what you said means nothing to me😃
I have a very basic understanding of wiring at best. Have you a diagram or could you expand?
How would I know how much current my fan takes for the switch?
Thanks again
Steve
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HowardB
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| posted on 25/4/14 at 08:32 PM |
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like this,..
[img]
 
Description
[/img]
Howard
Fisher Fury was 2000 Zetec - now a 1600 (it Lives again  and goes zoom)
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britishtrident
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| posted on 25/4/14 at 09:10 PM |
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All you will achieve is make the fan operation less reliable, just choose the correct fan switch and supply it from a permanent on supply.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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omega 24 v6
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| posted on 25/4/14 at 10:49 PM |
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What BT has said is quite true. But it does help ( the extra switch that is) in an emergency if the stat switch happens to fail. Some of the cheaper
ones are very poor and fail.
If it looks wrong it probably is wrong.
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snowy2
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| posted on 26/4/14 at 06:17 AM |
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This exact question has been covered with a comprehensive wiring diagrams
here......Wiring article
Hope it is of help....its one of two articles on the link..the second one is the one you want.
sometimes you are the pigeon, most of the time the statue.
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snowy2
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| posted on 26/4/14 at 06:40 AM |
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quote:
Originally posted by HowardB
like this,..
[img]
Description
[/img]
if your using a relay you don't need a 30A switch. a micro switch will activate a relay safely. if you need a 30A switch you dont need a 30A
relay there is no point.
do you know i really should read the post more carefully.....you say that on your diagram....ooops Sorry. Dave.
[Edited on 26/4/14 by snowy2]
sometimes you are the pigeon, most of the time the statue.
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snowy2
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| posted on 26/4/14 at 06:47 AM |
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quote:
Originally posted by britishtrident
All you will achieve is make the fan operation less reliable, just choose the correct fan switch and supply it from a permanent on supply.
not true....many production cars use relays to switch the fan, and adding a manual switch in parallel to the thermostatic switch will have zero effect
on it's operation. the manual switch just does the same job the thermostatic switch does........turns on the relay.
In fact using a relay actually makes the thermostatic switch more reliable over the long term, how its switched on will not affect any component in
the given circuit.
sometimes you are the pigeon, most of the time the statue.
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omega 24 v6
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| posted on 26/4/14 at 09:45 AM |
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I think the point being made is if you forget to turn the manual switch off when you are on the open road then it is counter productive to air flow
through the radiator.
If it looks wrong it probably is wrong.
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steve8274
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| posted on 26/4/14 at 09:52 AM |
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Thanks for all the replies. Will give it a go this weekend. If I wire it with a warning light then hopefully I shouldn't leave it on
Steve
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snowy2
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| posted on 26/4/14 at 07:19 PM |
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My circuit above also illuminates a warning lamp on the dash, either with the manual switch or when the thermostatic switch operates. comforting when
in heavy traffic.
sometimes you are the pigeon, most of the time the statue.
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adithorp
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| posted on 26/4/14 at 07:37 PM |
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quote:
Originally posted by snowy2
My circuit above also illuminates a warning lamp on the dash, either with the manual switch or when the thermostatic switch operates. comforting when
in heavy traffic.
I did that using an LED. Unfortunately the wind blowing the fan around caused the motor to act as a dynamo and the LED flashed above 30mph. I had to
put a diode in the line to prevent it back feeding.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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snowy2
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| posted on 28/4/14 at 05:39 PM |
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because my circuit is with a relay the same problem wont occur (the relay isolates the cct.)
sometimes you are the pigeon, most of the time the statue.
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