Dual Fan Wiring

Talk about the E-Type Series 3

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215m3
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#1 Dual Fan Wiring

Post by 215m3 » Fri Mar 15, 2019 9:22 am

Hi

On preparing my car to get on the road this summer I am going over a few parts. The dual fan relay needs replacing and am looking for some help. There are a few questions below: -

1. In the picture below there is a cut wire(arrowed), does anyone know if this is meant to be cut?

2. Also how many wires go to the relay?

3. It also looks like the wiring to the fan bypasses the relay too?

4. What is the upgrade for this relay part that has been mentioned?

5. Can someone who has a correctly fitted fan and wiring to the relay post a picture of their setup please?

Image

Image

Thanks in advance
Toby
2010 RRS Overfinch GTS
E30 M3 Turbo
E34 M5 Trackcar
V12 Roadster

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Colin
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#2 Re: Dual Fan Wiring

Post by Colin » Fri Mar 15, 2019 5:51 pm

Hi Toby
I have uploaded a couple of photos which are images of my car before restoration and one after where the fans work perfectly well in both cases. I have fitted a new loom so the colours may be more visible.
There is also a Powerpoint presentation in the Technical Information & Documentation of the forum.
Right down towards the bottom under the S3 Parts catalogue its shown as S3 Fan wiring diagram (animated) this should help you.

Try and drop this link into your internet address for the presentation.
https://www.dropbox.com/s/niqvpd3w5tcfe ... ppsm?dl=1l

You can pan in on my photos which may help. This is a UK car No AirCon

Image

Image

Good Luck
Colin
S3 V12 2+2 under full restoration
V12 Series III 2+2 1973

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215m3
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#3 Re: Dual Fan Wiring

Post by 215m3 » Fri Mar 15, 2019 8:37 pm

Hi Colin

Thanks for the pictures, all I can say is oh dear. Will need to see if I can work out why your relay has 5 wires going to it and mine has 2. Will need to chase them back when the radiator is off.
Toby
2010 RRS Overfinch GTS
E30 M3 Turbo
E34 M5 Trackcar
V12 Roadster

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PeterCrespin
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#4 Re: Dual Fan Wiring

Post by PeterCrespin » Sat Mar 16, 2019 1:29 pm

215m3 wrote:
Fri Mar 15, 2019 8:37 pm
Will need to see if I can work out why your relay has 5 wires going to it and mine has 2. Will need to chase them back when the radiator is off.
I suspect the only thing you actually need to work out Toby, is where to buy your workshop manual if your dad didn't get one during his ownership. As it happens, there is a wiring diagram in the little blue handbook you do have. This will reveal all, plus save you time and backache.

HOWEVER, Series 3 cars do not have overheating problems, so if yours does do you think it might be connected to butchered cooling fan wiring? Might it be an idea to sort that out with a ten quid manual and see how she drives, before splashing out ('scuse pun) on five hundred quid's worth of possibly un-needed cooling system parts?
1E75339 UberLynx D-Type; 1R27190 70 FHC; 1E78478; 79 S2 XJ12L; 97 XJ6L

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#5 Re: Dual Fan Wiring

Post by 215m3 » Sat Mar 16, 2019 11:37 pm

Thanks for your reply Peter.

Looks like I need to get a quick course in reading wiring diagrams!

When my dad got the car back from Flying Cat on it’s journey home the oil pressure dropped. They picked it up and was instructed to deliver it in person when fixed. They parked the car on the drive, no issues, Dad turned the car round and the car promptly spit all it’s coolant out. It has not been moved since.

The radiator and header have seen better days and will probably benefit from a new core. My plan is now to also review the wiring and see if I can compare it to the manual.
Toby
2010 RRS Overfinch GTS
E30 M3 Turbo
E34 M5 Trackcar
V12 Roadster

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#6 Re: Dual Fan Wiring

Post by Colin » Sun Mar 17, 2019 9:56 am

Hi Toby
I found the Coventry Auto components S3 wiring diagram much easier to follow than the workshop manual

They are available on eBay for £10.50.
I have dropped in the link below

https://www.ebay.co.uk/itm/Classic-Jagu ... ect=mobile

You may be better biting the bullet and renewing the electric fan looms which plug in to the main loom which are available from Autosparks or Barratts or Robey it depends if your an expert or a novice like me, that route may make life easier.

The relay or the Otter switch could be suspect as well so you may well have to replace those as well

Good luck
Colin
V12 Series III 2+2 1973

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Ole-xke1974
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#7 Re: Dual Fan Wiring

Post by Ole-xke1974 » Sun Mar 17, 2019 11:06 am

Hi Toby,
I have the wiring diagram as pdf. That can get you going on the wires and relay right away if you are interested.
Cheers ...... Ole
1974 SIII E-Type w. XJ S2 4sp w. O/D

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#8 Re: Dual Fan Wiring

Post by mgcjag » Sun Mar 17, 2019 11:17 am

Wireing diagram pdf is in the knowledge base section.....
Steve
1969 S2 2+2 & Building a C type replica

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#9 Re: Dual Fan Wiring

Post by 215m3 » Sun Mar 17, 2019 12:12 pm

Ole-xke1974 wrote:
Sun Mar 17, 2019 11:06 am
Hi Toby,
I have the wiring diagram as pdf. That can get you going on the wires and relay right away if you are interested.
Cheers ...... Ole
Hi Ole

Yes please. Could you send them to my email - toby.brittain@bmminiparts.com

Thanks
Toby
2010 RRS Overfinch GTS
E30 M3 Turbo
E34 M5 Trackcar
V12 Roadster

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#10 Re: Dual Fan Wiring

Post by Ole-xke1974 » Sun Mar 17, 2019 12:32 pm

Done !
1974 SIII E-Type w. XJ S2 4sp w. O/D

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dpugh
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#11 Re: Dual Fan Wiring

Post by dpugh » Tue Mar 19, 2019 7:31 am

Check the fans haven't been rewired to the spare switch on the right hand side. (HRW switch in coupes).

That's what happened to mine, only the seller negated to tell me. I had been driving around for months without the fans going on. I only found out when I left it running outside my house after a drive and it overheated.

For some reason someone had rewired so the switch was the only control. Anyway replaced otter switch, wiring loom for the fans and it all works perfectly. As the wires for the switch were already there, I wired in the switch to bridge the otter switch connections just in case as a manual override. (not how they had it!)
Dave

1973 OTS S3 Manual UK spec
1972 2+2 S3 Manual UK Spec (In bits for a long time...too long)

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#12 Re: Dual Fan Wiring

Post by 215m3 » Thu Mar 21, 2019 8:20 pm

Can someone upload a picture of where the fan wiring meets the loom. It is only £20 ish for a new loom and as mine has been butchered it is a no-brainer

Does this loom have 3 connections to the engine loom?
Toby
2010 RRS Overfinch GTS
E30 M3 Turbo
E34 M5 Trackcar
V12 Roadster

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#13 Re: Dual Fan Wiring

Post by Ole-xke1974 » Thu Mar 21, 2019 10:52 pm

There's a support arm on either side of the radiator going to the "picture frame" (square frame in front of the engine). The RH arm should have the wires strapped to it and the connection to the loom is where the radiator support meets the picture frame.

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1974 SIII E-Type w. XJ S2 4sp w. O/D

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#14 Re: Dual Fan Wiring

Post by 215m3 » Fri Mar 22, 2019 12:54 pm

Thanks Ole, how many wires connect into the main loom?

I have attached a picture with a red circle and I think it is 3 wires. This is Colin's engine from earlier in the post.

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Toby
2010 RRS Overfinch GTS
E30 M3 Turbo
E34 M5 Trackcar
V12 Roadster

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#15 Re: Dual Fan Wiring

Post by Ole-xke1974 » Sat Mar 23, 2019 12:20 pm

Toby,
Yes, that shows the connectors.
I'll have to go and look at my car, but it isn't that many.
From memory:
A heavy gauge 12V (brown, I believe) 12V switched on by ignition, a ground (negative) a control wire from the AC relay (not sure if the AC wire is present on a non-ac car. 3 maybe 4 in total.
There are two wires going to the bottom of the radiator for the otter switch.
Cheers ...... Ole
1974 SIII E-Type w. XJ S2 4sp w. O/D

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