shortie
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| posted on 25/7/04 at 10:52 AM |
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Cooling fan
Just sorting out the wiring for the car and wondered what others have done with their cooling fan. I am using the bike loom but it seems to suggest
that the feed for the fan is only on when the ignition is on. I guess this means it won't keep running to cool the engine after the ignition is
off so I wondered whether others have changed it to be directly fed from a fused battery feed?
cheers,
Rich.
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RoadkillUK
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| posted on 25/7/04 at 10:56 AM |
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I don't think it really matters if the fan runs after the engine has stopped, it's not as if it's going anywhere and the only water
being cooled by the fan will be in the radiator as the water pump won't be running.
Roadkill - Lee
www.bradford7.co.uk
Latest Picture (14 Sept 2014)
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shortie
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| posted on 25/7/04 at 10:57 AM |
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Good point, didn't think of that!
thanks,
Rich.
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Northy
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| posted on 25/7/04 at 01:50 PM |
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There is still a small flow of water due to convection (I think thats the right word), ie cold water sinking.
If it wasn't necessary why would all major car manufacturers wire it on a permanent feed?
Cheers
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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DEAN C.
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| posted on 26/7/04 at 01:16 AM |
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I've done mine as a permanent supply,as I've seen engines boil over loads of times after they've stopped.....
The engine temp. will not drop after stopping straight away but if the rad temp is lowered it will help a bit ....
I think !
I think Northy meant conduction not convection but ,Hey who gives a shit!
It's still a transfer of energy!
It's 24 years since I did my phsyics O level!!!!!!!!!!
Once I've finished a project why do I start another?
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JoelP
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| posted on 26/7/04 at 07:16 AM |
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quote:
Originally posted by DEAN C.
I think Northy meant conduction not convection but ,Hey who gives a shit!
its convection that keeps the water moving, as cold water sinks in hot water! conduction will also help as the engine block will radiate heat into the
engine bay.
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zetec
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| posted on 26/7/04 at 07:43 AM |
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All the production cars I have had turned the fan on/off with the ignition. Most of the aftermarket ECUs do the same. I think there an arguement that
if the engine and cooling system are working OK then restarting with the engine temp as near to normal running temp the better.
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David Jenkins
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| posted on 26/7/04 at 07:48 AM |
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Strange, all the production cars I've owned recently (Toyotas) were the exact opposite! On hot days you'd hear the fan running for a
while after stopping.
Mind you, with modern cars the ECU may decide whether to keep the engine warm by not running the fan, or start the fan if the engine's showing
signs of getting too hot, rather than rely on a simple thermo switch.
The clockwork technology in our Locosts isn't up to this level of sophistication!
David
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Baldrick
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| posted on 26/7/04 at 07:55 AM |
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Mines wired to the unswitched feed. After a long run (around lovely borders lanes) I get back home stop & turn off. After 30 secs or so the fan
comes on and runs for 3 or 4 mins. Without this I would imagine the water would get very hot - maybe boil? The fan only cools down to running temp
anyway.
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