john v

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

doga-ot

iTrader: (1)

Here bud this is for twin fan but its exactly the same!

doga-ot

iTrader: (1)

hope this helps

john v

Brilliant, can't thank you enough, that's a job for tomorrow then.

doga-ot

iTrader: (1)

No problem

Turbosystems

iTrader: (5)

you'd be better using the diagrams in the link below
http://www.aaroncake.net/rx-7/efaninstall.htm

john v

Thankyou, that sounds like the way to go then as I like the idea of the fan staying on for a bit when the engines stopped running,
Thanks again

Mk4 Rick

Nice diagram have you used this set up because I need to wire a fan in as well.

Turbosystems

iTrader: (5)

Use the diagrams in the link above not the one posted by doga-ot

doga-ot

iTrader: (1)

not yet got it off a site was going too but now I've got a braided twin fan loom...

Turbosystems

iTrader: (5)

use the diagrams in the link I posted

doga-ot

iTrader: (1)

I got braided twin fan loom now, I said lol. That's why I didn't end up using it!

st220kyle

The fuse is in the wrong place in that pic isn't it?

Mk4 Rick

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

st220kyle

what diagram are you working from?

Mk4 Rick

http://www.aaroncake.net/rx-7/efaninstall.htm this one first diagram lol

st220kyle

30 - 12v 30a supply
85 -(can be linked to pin 30)
86 - negative/earth which is switched by a thermostat

GVK.

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...

Mk4 Rick

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

GVK.

86 in this case is going to ground through the thermostat.

As st22kyle posted previously!

Mk4 Rick

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?

st220kyle

I have no idea, Thats one for GVK

fraser9764

iTrader: (3)

I think doga-ot should remove that drawing in case anyone follows it
the fuse is in the wrong place and the fan switch will last 2 minutes, if that.

opposite lock

iTrader: (3)

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.

doga-ot

iTrader: (1)

on my diagram it was short hand lol switch live meant (switched live) not a live with switch.... Any how as I said never used it in end bought a braided loom

fraser9764

iTrader: (3)

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...

doga-ot

iTrader: (1)

I just copied it of a page on here somewhere last year I got no clue on electrics

opposite lock

iTrader: (3)

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.

Mk4 Rick

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

GVK.

Yeh, don't wire it up to the coolant temp sensor (ECT)

whateveryoudo

Mk4 Rick

Yeah so fan switch it is.I thought it couldn't be the ect sensor but thought id double check

Mk4 Rick

Im not sure what to do with pin 86.The thermostat wire is all wired up to the ecu isn't it

martysmartie

iTrader: (1)

Pin 86 is the relay ground, which is switched via the thermoswitch, so it connects to here and the other side of that switch to ground.

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