HOW TO TEST RADIATOR FAN SPEEDS FROM TRINARY SWITCH (DIESEL CDT/i, 1.8 & KV6 Variants - Page 2

Alex30013k · 30th April 2009, 14:05

Hello thanks for that, all I know is that the fan the garage got was not the correct one, it was from smc, and they had to change the wires around,
I been wanting to take my bumper off so will look at the wires,

As for what fan it was I know it don't have the resister that you can see in the grill?

Jules · 30th April 2009, 21:00

Ah right, that's a different scenario then!
Above fault finding was assuming you had the 2 speed motor with resistor.

Sounds like the Garage supplied you with a half duff old type 3 speeder, which has no SPEEDS left at all due to worn brushes.

Advice to all is not to buy a used 3 speed fan unless it's done under 20k miles Chances of that these days are pretty slim.

It's not worth all the labour of fitting an unknown used motor, only to have to attend to it again a few months down the line. (false economy etc)

Good luck
Jules

James.uk · 1st May 2009, 00:30

Jules did indeed send poor John off into town to get some milk the minute he arrived! tsk tsk.. And just as well he did too as by then Jeff was looking at my flask of coffee with thirsty eyes!

Good job you came John, coz my car was in bits, and Jules car was trapped behind it, and the village is a long walk away!

I will go see Jeff and interogate him about the missing bisciuts, coz he is thin as a rake but could eat for England!

..

Alex? while you have the front off don't forget to check your "O" rings and stuff. If you need more info I expect Jules will tell you what you need to look out for. :lol:
.

Alex30013k · 1st May 2009, 03:54

Hello

The motor and relay were brand new,

I had a loook at my "O" ring a little while ago but will defo look at it again,

Thanks for your help.

brrm · 13th May 2011, 15:31

[QUOTE=Jules;305987]
1.8 & KV6 tests are very similar (wire colours differ but plug pins are the same) but engine has to be running on Petrol versions.
V8 tests differ from this & will follow shortly (wire colours differ and test results

Um, don't suppose you'd mind adding the V8 test procedure, please? I'm fairly sure I have a 2 speed fan (Oct 2003 car) and would like to be sure it's working as intended.

chipsceola · 30th April 2012, 15:16

If you swap an 2 speed early (2002) fan assembly for later 2 speed with gold resistor is simply plug & play or are wiring changes or a T4 session needed for it be recognised and operate as it should please.
Chips

Jules · 30th April 2012, 19:34

[QUOTE=brrm;723622]

Quote:

Originally Posted by Jules

1.8 & KV6 tests are very similar (wire colours differ but plug pins are the same) but engine has to be running on Petrol versions.
V8 tests differ from this & will follow shortly (wire colours differ and test results

Um, don't suppose you'd mind adding the V8 test procedure, please? I'm fairly sure I have a 2 speed fan (Oct 2003 car) and would like to be sure it's working as intended.

Oops sorry only just seen that question !! So little time these days

Quote:

Originally Posted by chipsceola

If you swap an 2 speed early (2002) fan assembly for later 2 speed with gold resistor is simply plug & play or are wiring changes or a T4 session needed for it be recognised and operate as it should please.
Chips

You mean change early 3 speed to a 2 speed?

It's plug & play provided its from a petrol variant as in your case.
Diesel fans have a PWM PCB inside the control box and one signal relay wire is on a different pin a the plug end.
No T4 work required.

For more info see Fan threads on here (plenty)!!
You are quite welcome to read the tech info in my forum shop or eBay shop links below

Good luck
Jules

chipsceola · 30th April 2012, 21:34

Many thanks for that Jules, answer and technical info in your shop threads very clear.
Chips

SD1too · 1st May 2012, 07:54

Quote:

Originally Posted by Jules

Diesel fans have a PWM PCB inside the control box and one signal relay wire is on a different pin a the plug end.

Hi Jules,

I've seen a diesel system with the slate (grey) and blue/red thin signal wires swapped over at the loom connectors. Is this what you've found? If so, have you any explanation why MGR would do this? Did they change the loom wiring to match?

Simon.

kael · 27th December 2013, 22:18

My 2002 CDT has clocked 170000km and the 3speed fan is still working fine at LOW speed (demist check), I mostly have ECON on instead of AUTO.

Intresting to read how to test:
LOW speed (switch demist on)
MED speed (bridge trinary connector)
HIGH speed (demist on and then bridge trinary connector)
But when exactly are these 3 speeds used in real live situations? How to observe them?

If I understood right the trinary is aswell a temp switch as a pressure switch? Does 'tri' stand for triple action?
Or is it a double pressure switch like explained here: http://www.hotrodders.com/forum/atta...7&d=1156426613

Since I bought the car new I Always found that the always-on-fan is kinda annyoing and overkill when riding at high speed.
Why didn't they implemented a temp sensor like in the linked PDF?

30th April 2009, 21:00	#12
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Ah right, that's a different scenario then! Above fault finding was assuming you had the 2 speed motor with resistor. Sounds like the Garage supplied you with a half duff old type 3 speeder, which has no SPEEDS left at all due to worn brushes. Advice to all is not to buy a used 3 speed fan unless it's done under 20k miles Chances of that these days are pretty slim. It's not worth all the labour of fitting an unknown used motor, only to have to attend to it again a few months down the line. (false economy etc) Good luck Jules __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

13th May 2011, 15:31	#15
brrm Avid contributor MG ZT-T 260 Join Date: Feb 2011 Location: Oxford Posts: 134 Thanks: 1 Thanked 3 Times in 3 Posts	[QUOTE=Jules;305987] 1.8 & KV6 tests are very similar (wire colours differ but plug pins are the same) but engine has to be running on Petrol versions. V8 tests differ from this & will follow shortly (wire colours differ and test results Um, don't suppose you'd mind adding the V8 test procedure, please? I'm fairly sure I have a 2 speed fan (Oct 2003 car) and would like to be sure it's working as intended. __________________ Arthur Bullard Mk1 MG ZT-T 260 #036, Le Mans Green, Press Car http://farm6.static.flickr.com/5309/...5d6b7541_m.jpg

27th December 2013, 22:18	#20
kael Newbie Rover 75 Tourer Join Date: Nov 2013 Location: ostend (BE) Posts: 25 Thanks: 2 Thanked 4 Times in 1 Post	My 2002 CDT has clocked 170000km and the 3speed fan is still working fine at LOW speed (demist check), I mostly have ECON on instead of AUTO. Intresting to read how to test: LOW speed (switch demist on) MED speed (bridge trinary connector) HIGH speed (demist on and then bridge trinary connector) But when exactly are these 3 speeds used in real live situations? How to observe them? If I understood right the trinary is aswell a temp switch as a pressure switch? Does 'tri' stand for triple action? Or is it a double pressure switch like explained here: http://www.hotrodders.com/forum/atta...7&d=1156426613 Since I bought the car new I Always found that the always-on-fan is kinda annyoing and overkill when riding at high speed. Why didn't they implemented a temp sensor like in the linked PDF? __________________ I prefer with 2 in the 160, than 1 in the 260.

30th April 2009, 14:05	#11
Alex30013k Posted a thing or two Rover 75 Saloon 2.0 CDTi Conn Se Join Date: Nov 2006 Location: Ashford Kent Posts: 1,560 Thanks: 17 Thanked 29 Times in 21 Posts	Hello thanks for that, all I know is that the fan the garage got was not the correct one, it was from smc, and they had to change the wires around, I been wanting to take my bumper off so will look at the wires, As for what fan it was I know it don't have the resister that you can see in the grill?

1st May 2009, 00:30	#13
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	Jules did indeed send poor John off into town to get some milk the minute he arrived! tsk tsk.. And just as well he did too as by then Jeff was looking at my flask of coffee with thirsty eyes! Good job you came John, coz my car was in bits, and Jules car was trapped behind it, and the village is a long walk away! I will go see Jeff and interogate him about the missing bisciuts, coz he is thin as a rake but could eat for England! .. Alex? while you have the front off don't forget to check your "O" rings and stuff. If you need more info I expect Jules will tell you what you need to look out for. :lol: .

1st May 2009, 03:54	#14
Alex30013k Posted a thing or two Rover 75 Saloon 2.0 CDTi Conn Se Join Date: Nov 2006 Location: Ashford Kent Posts: 1,560 Thanks: 17 Thanked 29 Times in 21 Posts	Hello The motor and relay were brand new, I had a loook at my "O" ring a little while ago but will defo look at it again, Thanks for your help.

30th April 2012, 15:16	#16
chipsceola This is my second home Jaguar XF 3.0D Join Date: Nov 2010 Location: Southampton Posts: 4,364 Thanks: 119 Thanked 509 Times in 426 Posts	If you swap an 2 speed early (2002) fan assembly for later 2 speed with gold resistor is simply plug & play or are wiring changes or a T4 session needed for it be recognised and operate as it should please. Chips

30th April 2012, 21:34	#18
chipsceola This is my second home Jaguar XF 3.0D Join Date: Nov 2010 Location: Southampton Posts: 4,364 Thanks: 119 Thanked 509 Times in 426 Posts	Many thanks for that Jules, answer and technical info in your shop threads very clear. Chips