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Chicken switch ( standard 2 speed fan)
Posted: 03 Jun 2017, 16:42
by itchyfeet
Did this today on stage 2 as both wires are inside the cab and stage 2 is low current as it just feeds a relay
To do stage 1 needs a high current switch and wire and an external water proof connection.
Red/White ( power) to red/blue just above fusebox, ths is a parallel switch to the thermo switch in radiator.
I'm sure it's been covered before but pics to share as usual
Hole was already there so may as well use it
E D I T 2018, pbucket pics will probably die soon so here are some more......
Here is a guide for a late van RHD 2 speed fan.....
You are adding a switch here between red/white and red/blue this essentially does the same job as the 102 deg C switch ( stage 2) in F18 which is your rad temp switch.
As you can see it only triggers a relay but best to use a 30A switch to make sure it's a good one.
The circuit has a 30A fuse so if any of the wiring was to short there the wires at 1.5mm2 and 30A switch can handle it and blow the fuse before melting.
you also need 30A connectors which is why I recommend Wago 222, pretty much idiot proof.
chicken switch wiring diagram by
Paul_Barr, on Flickr
drop down glovebox by bending tabs
P1100280 by
Paul_Barr, on Flickr
remove fusebox screw and lift fuse box off pegs
P1100281 by
Paul_Barr, on Flickr
chicken switch fusebox by
Paul_Barr, on Flickr
locate red/white and red blue wires, cut them strip then and rejoin with wago 222 connectors, then add 1.5mm2 switch wires to a 30A switch located in a suitable position.
Chicken switch by
Paul_Barr, on Flickr
P1100279 by
Paul_Barr, on Flickr
Re: Chicken switch ( standard 2 speed fan)
Posted: 03 Jun 2017, 17:41
by Oldiebut goodie
I always thought that the stage 1 switching was dealt with by the relay on the fuse/relay board.
Belay that - it is the other way around, stage 2 is dealt with by the no. 5 relay/fuse board with the 30A fuse according to the diagram.
Re: Chicken switch ( standard 2 speed fan)
Posted: 03 Jun 2017, 17:51
by itchyfeet
yep wiring diagram here...
http://syncrosport.com/info/wiring/T3_Radiator_Fan.jpg" onclick="window.open(this.href);return false;
3 way commoned connectors are Wago 222 or 221 32A simple easy, available in 2,3 and 5 way.
Re: Chicken switch ( standard 2 speed fan)
Posted: 03 Jun 2017, 18:26
by Oldiebut goodie
There appears to be differing use of relays - the relay position diagram and the one you linked to.
I have a 40A relay in position 5 (radiator fan) on the board and the 50A radiator fan one by the earth crowns. ( I have always assumed that someone had previously used a 40A rated one instead of 30A on the board) So there would be no need for high rated switches as both the circuits are already covered by relays.
Just googled the no.53 relay - it is supposed to be 40A.
Re: Chicken switch ( standard 2 speed fan)
Posted: 03 Jun 2017, 18:43
by itchyfeet
Stage 1 deffo does not have a relay ( it would not need 2.5mm2 if it did ) relay by earth crowns is a diesel thing I think.
Re: Chicken switch ( standard 2 speed fan)
Posted: 03 Jun 2017, 19:16
by Oldiebut goodie
There is something odd here somewhere - I have looked at the wiring diagrams for the 1.7 & 1.6 diesels - they start with the diagram showing the 40A 2nd stage relay in position 5 but the actual circuit shows the 50A 2nd stage relay and it states that it is behind the dash! ( which it is
)
Why is that 40A relay marked as being the radiator fan on every diagram? Weird. I would go and trace the 40A relay on mine if I could but my bones won't let me bend or anything at the moment.
Re: Chicken switch ( standard 2 speed fan)
Posted: 11 Apr 2023, 17:45
by ELVIS
Have my dash in bits
Found the Red/White ok. Can anyone confirm where the red/blue is? Iβve found one that is after the relay and disappears towards fan but not one behind the relay plate.
Anyone know what terminal or plug itβs on?
Re: Chicken switch ( standard 2 speed fan)
Posted: 11 Apr 2023, 17:53
by ELVIS
H6?
(From Robseys fab post about CE1 layout)
Re: Chicken switch ( standard 2 speed fan)
Posted: 11 Apr 2023, 20:21
by Robsey
If you have a CE1 blade-fuse fuse box.
Then the blue / red wire comes from a separate plug.
It will be on the brown H connector.
(Taken from my other thread...)
H BROWN 2 STAGE RELAY FOR RAD FAN
H1 BROWN 2ND STAGE RELAY GROUND - RELAY 5 (J101) PIN 5 (85)
H2 INTERNAL red black - 2 STAGE RELAY (J101) RELAY PIN 2
H3 RED - CONNECTOR T3H / 1 - RAD FAN RELAY PIN 8 (87)
H4 INTERNAL green yellow - 2 STAGE RELAY (J101) RELAY PIN 7
H5 INTERNAL yellow red - 2 STAGE RELAY (J101) RELAY PIN 3
H6 RED / BLUE RADIATOR THERMO SWITCH PIN 1 RELAY PIN 6 (86)
And my chicken switch modification
So for clarification...
The blue / red on a standard loom goes from H6 to the No 1 pin fan thermo switch.
Re: Chicken switch ( standard 2 speed fan)
Posted: 11 Apr 2023, 21:35
by Smiffo
Nice one Robsey!!
I assume you need to use the rear hater switch to activate high speed fan then?
i.e. it will never activate on its own due to temp automatically?
Or... Am I reading it wrong?Β
Re: Chicken switch ( standard 2 speed fan)
Posted: 11 Apr 2023, 22:54
by Robsey
You don't need to use the rear heated window switch, but as my van does not have a heated rear window, it just kept the dash looking tidy.
As such, all you need is...
A 12 volt feed to the switch of your choice.
Then from the switch to connector H6.
It doesn't need to be a heavy wire - it is just to trigger the relay.
If you have a single speed fan, then you can connect the fat red from H3 to the switched side of the fan thermo switch...
(Join with the red/black wire)
Or the live feed side of the blower motor.
If you have a two speed fan motor, then you can connect the fat red on H3 to the motor live feed pin 2.
(As in my diagram).
I hope that makes sense
Re: Chicken switch ( standard 2 speed fan)
Posted: 11 Apr 2023, 22:58
by Smiffo
Robsey wrote: β11 Apr 2023, 22:54
You don't need to use the rear heated window switch, but as my van does not have a heated rear window, it just kept the dash looking tidy.
As such, all you need is...
A 12 volt feed to the switch of your choice.
Then from the switch to connector H6.
It doesn't need to be s heavy wire - it is just to trigger the relay.
If you have a single speed fan, then you can connect the fat red from H3 to the switched side of the fan thermo switch...
(Join with the red/black wire)
Or the live feed side of the blower motor.
If you have a two speed fan motor, then you can connect the fat red on H3 to the motor live feed pin 2.
(As in my diagram).
I hope that makes sense
Makes sense, yes!
Top man, Robsey.
Re: Chicken switch ( standard 2 speed fan)
Posted: 11 Apr 2023, 23:10
by Robsey
Excellent -
Happy to help.
UPDATE: -
As said in an earlier post, I am not sure "how beneficial" this circuit would be, if you have a problem with a faulty thermostat or water-pump, as it is the engine you would need to cool, not the radiator.
Being some 14ft away, this would only help with cooling if you are stuck in traffic, and the engine side of things are okay.
One benefit is it may cool the bulkhead and floor of the cab of the van wiith a constant cooling breeze on the third Wednesday in May when the sun comes out to play.
Re: Chicken switch ( standard 2 speed fan)
Posted: 12 Apr 2023, 12:54
by ELVIS
I am in the unfortunate position someone has drilled four differing holes in the lower face of a mint LLE dash
Going to Switzerland in the summer all being well so that fills one hole
Have brand new water pump radiator stat and hoses to fit beforehand though.
Re: Chicken switch ( standard 2 speed fan)
Posted: 12 Apr 2023, 14:12
by Smiffo
ELVIS wrote: β12 Apr 2023, 12:54
I am in the unfortunate position someone has drilled four differing holes in the lower face of a mint LLE dash
Going to Switzerland in the summer all being well so that fills one hole
Have brand new water pump radiator stat and hoses to fit beforehand though.
You could put one of those horns in that plays tunes?
Perhaps one hole for a button that plays an ice cream truck tune, one for the dukes of hazard tune, and one for the A-team?Β
That leaves one for the chicken switch!Β
( This was a joke BTW )Β