How to wire up a cooling fan
#1
I'm Finding My Feet Here Now
Thread Starter
How to wire up a cooling fan
Hi all, I've just fitted a new radiator into my mk1 escort , it's got a fan attached to the front and a temp switch in the header, can anyone tell me how to wire it up and if I need a relay what one,
Thanks for any help
Thanks for any help
#7
I'm Finding My Feet Here Now
Thread Starter
you'd be better using the diagrams in the link below
http://www.aaroncake.net/rx-7/efaninstall.htm
http://www.aaroncake.net/rx-7/efaninstall.htm
Thanks again
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#8
Advanced PassionFord User
#9
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you'd be better using the diagrams in the link below
http://www.aaroncake.net/rx-7/efaninstall.htm
http://www.aaroncake.net/rx-7/efaninstall.htm
#14
Advanced PassionFord User
Ive got a twin fan set up.So the diagram set up with allows the fan to run longer in the hot weather is this the best set up .Can some one simplify the diagram a bit lol.I get most of it except pin 85 and 86 and 30.I thought pin 30 was for the accessories
#15
Advanced PassionFord User
what diagram are you working from?
#18
PassionFord Post Whore!!
You're just putting permanent feed to pin 85 (linked to 30) to allow it to run after being switched off.
87 is always the accessory whether it's a spot light, a fan whatever...
87 is always the accessory whether it's a spot light, a fan whatever...
#19
Advanced PassionFord User
Cheers for your help.Im gonna get it wired up soon as because right now I have it on a switch and that's not good at all.Isnt the thermostat that's wired to pin 86 classed as an accessory as well
Last edited by Mk4 Rick; 30-01-2014 at 06:22 PM.
#21
Advanced PassionFord User
When I did my conversiom on my fiesta mk4 I added the 2litre ecu and engine bay loom from the mondeo but the fan side of things was all messed up.So I want to go this way in adding a fan relay so every thing is fine again instead of using a fan on a switch.On the 2 litre blacktop thermostat housing is the fan switch on top of the housing or on the bottom and with my mondeo loom not having the original fan set up it wouldn't cause fuel problems would it like over fueling or running lean or run weird would it?
#24
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As above the 1st diagram shows the fan switch having direct feed running through it. The relay powers the fans not the switch .
edit-The battery feeds the fans the relay allows current to flow to them . Not the switch,that just controls the one side of the relay coil.
edit-The battery feeds the fans the relay allows current to flow to them . Not the switch,that just controls the one side of the relay coil.
Last edited by opposite lock; 02-02-2014 at 01:22 PM.
#26
PassionFord Post Troll
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You are still wrong though, the problem with your drawing is it shows the thermo switch inline with the fan, meaning all the current drawn by the fan motors will pass through the thermo switch. The switches can't take this kind of current and will fail. The thermo switch should be on the coil side of the relay,meaning the only current it sees is the few milliamps needed to energise the relay.
And the fuse should be the first thing in the circuit when the feed leaves the battery, any components or wiring before the fuse are unprotected should they short to earth.
And it doesn't matter if you didn't use it, it is still there for others to use. I just hope no one uses the drawing then has a problem causing a fire...
And the fuse should be the first thing in the circuit when the feed leaves the battery, any components or wiring before the fuse are unprotected should they short to earth.
And it doesn't matter if you didn't use it, it is still there for others to use. I just hope no one uses the drawing then has a problem causing a fire...
Last edited by fraser9764; 01-02-2014 at 10:43 PM.
#28
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GVK #18 is the one to use.
An SPST 40/30A 12V relay is what you need.
You can use 87 as your power in through to 30 or visa versa.
Same with 85 and 86 for activation. I prefer always using pin 30 for batt + its easier to remember. My live side of the coil i remember as 86 just like the world cup 'live' lol.
An SPST 40/30A 12V relay is what you need.
You can use 87 as your power in through to 30 or visa versa.
Same with 85 and 86 for activation. I prefer always using pin 30 for batt + its easier to remember. My live side of the coil i remember as 86 just like the world cup 'live' lol.
Last edited by opposite lock; 02-02-2014 at 03:15 PM.
#29
Advanced PassionFord User
Gonna wire this up over this week some time.I have one question though when we talk about temperature switch do we mean the fan switch because ive heard these being called alsorts of things
#31
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#33
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It is totally independent of the ECU, it is merely a switch that completes the relays circuit.
In modern cars this is a different story and these switches are mostly a thing of the past, instead the CTS reference is used and the ECU activates the fans when required.
Martin
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