Hi!

I'd like to install a twin electric fan in the place of the clutch fan and little electric fan.

I'd like to use the existing electric fan control system to operate the new twin fan.

Can someone tell me how to wire the new fan?

Thanks!

Tommaso

 

Grant Francis will be along soon, he has a terrific way of doing this, plus a clear diagram
greg

 

OOPS.

OK, I have the Ford Falcon (Aussie family car) twin thermo fans on my V12's, but any twin thermo fan arrangement that is readily available in your market should be fine.

I have wired it very simply.

The RH fan is relay controlled, and the relay earth is switched by the factory thermo switch already in the bottom hose inlet, and works just fine.

The LH fan is also relay controlled, and switched on by the a/c compressor activation wire.

I removed the factory fan/s, shroud, wiring and Blue relay (Diode pack), and started from square one.

Both fan relays are ignition activated, as in when the car switches OFF they are dead. I tried some delay relays etc, and it got too damn hard.

Its been that way now since 1996, and is just fine. Never runs above normal temp no matter what the outside temp is.

My only warning is that the cooling system is 100% clean, internally and externally, new 82c thermostats fitted of the correct length, and 2 new radiator caps fitted.

I have a drawing (hand drawn) somewhere on this laptop, and if you really need it, ask, and I will find it and attach it.

 

Thanks Greg, thanks Grant Francis!!!

Grant Francis,
when You have a moment and You can find the drawing of your wiring I'd really appreciate to see and use it!!! (if I succeed in replicate the wiring..... PUFF PUFF)

I'd like to use twin fans from Opel Vectra but I'm a little worried about the wiring and the use of relays because I'm inexperienced in electrical matters...

Hope for the best!!!

Tommaso

 

Start reading half way down page 219 in Kirby's book. It will cover just about any wiring scheme you want to run.

I'm running the stock small electric fan along with this Permacool 16" fan from Summit Racing. I decided to keep things as simple as possible, so both fans kick on and off according to Jaguar's original schedule.

 

Here ya go.

Couldnt find it, so drew it again.

If something is vague or blurry, let me know.

Lectrickery is SIMPLE, really.

Thermo fan wiring drawing.pdf

 

I have twin AU Falcon fans on mine, the wiring is like a birds nest. When I eventually get time I want to simplify it.
I assume your diagram should work for a 6 as well?

 

Yep.

Only thing the 6 cylinder is missing is the thermo switch, so that would need to a seperate thing.

The V12 has it in the lower hose alloy adaptor at the water pump.

Look at the Mazda, and you will see the thermo switch for the fans somewhere near the bottom hose area of the radiator, and surprise, surprise, nearly ALL manufacturers use the bottom hose temp for sensing things like fans, as it is significantly more reliable than the top hose area.

The top hose area gets fuzzy with the constant opening and closing of the thermostats.

Lets know by email if and when you need a hand.

Lectrickery, as I said is simple. "Red to Red, Black to Black, flick the switch and stand right back".

 

https://www.jaguarforums.com/forum/x...c-fans-118878/

 

Hi guys!

I'm following the great wiring scheme of Grant Francis with my twin fans...
but I've two questions.

Where can I find, in the engine bay, the battery feed wire for left fan and the ignition on source for the right one?

Thanks!!!

Tommaso

 

You can draw battery feed from the right side bulk head, it is originally for the starter motor.




About the ACC, you can draw wire from the sub fan control diode.
You can get a diagram from jagrepair.com

 

Hi guys!

I need your help... again...

I've done the wiring like the scheme, draw battery feed from the big brown wire on the right side of the
bulk head and the ignition on source from the pin "2" of the diode pack -the green wire-.

I then checked the fan jumping the connection of the temp stat... but the fan shouldn't come on with ignition on... GRRRRRRR!

Where can I start to find the problem?

Thanks,
Tommaso

 

If you followed Grant's scheme precisely, the fans won't come on with ignition on only.
You will need to have ac on or to warm the car up in order to make the either fan on.
When you use the original fan switch, the fan won't come on until the coolant temp exceeds 92c, which takes pretty much time.

 

Thanks Japthug,

I thought that jumping the connection of the temperature thermostat while ignition is on should activate the fan controlled by the themostat itself.

I've done this test because I've read it's a checking method for the OEM aux fan -that operates by thermostat too-: I thought it was the same rule ! But maybe I'm wrong...

I'll try to refill coolante and start engine to see what happens!

Thanks,
Tommaso

 

I would be testing that IGN wire you are using, and make sure you have battery volts when the ign is ON.

The relay is being switched ON with the ignition, BUT, due to no earth path (thermo switch is open contact) nothing happens.

By jumping the thermo switch, or earthing the corresponding relay terminal, should activate the fan when ign is ON.

If it does NOT, you got something wrong.

I have, on some cars, run that relay "switch on" wire from the +ve of the ignition coil. There is next to NO draw on that wire as it is only switching the relay coil to ON, so has NO effect on the ignition system.

My car is different, apart from the fact its mine, in that I stripped EVERY wire out the engine bay, and rewired it to suit my needs at the time, and incorporated a few extra Ign feed/accessory/etc wires into the new loom, as "I had a plan". Lots of extra relays etc just for later on.

 

Tommaso


I am sorry I should have read more carefully, you did write that you jumped the switch wire...
Then it must come on when perfectly wired. Of course no coolant is needed.

There is a fuse for electric fan relay in upper stream of fan diode unit wire, so you could check it first.
Bad contact of the fuse often happens.

You can also check the aux fan by bypassing the relay.

 

On the pre facelift V12 HE (not sure which is your model) the fuse no 1 in the fuse box on the LHS inner wing (the fuse nearest the front) does the aux fan. And also guys might like to know, although this is NOT mentioned in the Jaguar manuals, this fuse does the horn too !

Greg

 

Hello!

Little update: by jumping thermo switch with ignition on I can hear the "click" from the relay of the fan but the fan doesn't start.

The fan itself was operating before my installation in engine bay...

Maybe the problem is in the wiring from the relay to the fan...

 

Yep.

If you are using the factory wiring, DONT.

Run a new wire from the relay to the fan, and then make 100% sure the earth wire (2nd wire) of the fan is making a GOOD earth.

If that relay is clicking, then you are on the right track.

 

HURRA' HURRA'

I've found the problem: a loosen connector in the new relay's case...

Fixed and now the fan works!!!

Thanks!!!

Tommaso