Fan switch built in ???

ferser1 · 16th June 2019, 14:21

Dear members

I have a CDT 2.0 from 2005 and i noticed that one of the previous owners have built in a switch behind the steering wheel that operates the fan that cools off the radiator. So when i pull the switch (yeah its a pull switch) the fan spins which i believe is on the highest mode.

I also noticed that the airconditionin only blows cold air at idling when i switched on AC and when i switch on the fan manually.

When i switch only AC on, the radiatorfan does not spin when idling

The engine temperature stays at 90 steady all the time ,driving or when idle.

Now this is a huge hassle, turning on and off the fan at each idle moment, i would like to fix this so that it operates at is should and not manual.

I wonder what caused this situation that the previous owner needed to build in such solution.

How could i troubleshoot this problem??. I plan to go for holiday and this situation would not be ideal really..

Thanks

SD1too · 16th June 2019, 15:41

Hi Jan,

Your radiator fan's slow speed has failed. On a 2005 car the cause will almost certainly be a failed resistor. If you look through the radiator grille at about the two o'clock position, can you see a silver rectangular component with a wire at each end? That's the resistor.

The manual switch could have been installed for a number of reasons:

The owner may not have liked a garage's quote to renew the fan motor and control box (several hundred pounds).
The owner may not have known that such a simple remedy is available.
The owner may have been DIY minded but not keen on this particular repair.
Some people do strange things with their heating/ventilation/AC system, for example turning it off completely and opening windows.

Now you know that the solution is not too difficult.

Simon

ferser1 · 16th June 2019, 16:20

thanks for the reply!

i remember i checked last week and i saw a golden colored rectangular component there, not sure if i saw the cables was quite dark spot, but are you referring to this component? Where can i buy a new one??

So in this case it could go either the cheaper way (replace gold colored component) or less cheaper way (replace control box) as far as i understood

I could do the replace resistor job , remove grill replace part but troubleshooting fan motor and control box sounds like a job for a garage , right?

Quote:

Originally Posted by SD1too

Hi Jan,

Your radiator fan's slow speed has failed. On a 2005 car the cause will almost certainly be a failed resistor. If you look through the radiator grille at about the two o'clock position, can you see a silver rectangular component with a wire at each end? That's the resistor.

The manual switch could have been installed for a number of reasons:

The owner may not have liked a garage's quote to renew the fan motor and control box (several hundred pounds).
The owner may not have known that such a simple remedy is available.
The owner may have been DIY minded but not keen on this particular repair.
Some people do strange things with their heating/ventilation/AC system, for example turning it off completely and opening windows.

Now you know that the solution is not too difficult.

Simon

Yorkshire GOC · 16th June 2019, 16:21

Quote:

Originally Posted by SD1too

Hi Jan,

Your radiator fan's slow speed has failed. On a 2005 car the cause will almost certainly be a failed resistor. If you look through the radiator grille at about the two o'clock position, can you see a silver rectangular component with a wire at each end? That's the resistor.

The manual switch could have been installed for a number of reasons:

The owner may not have liked a garage's quote to renew the fan motor and control box (several hundred pounds).
The owner may not have known that such a simple remedy is available.
The owner may have been DIY minded but not keen on this particular repair.
Some people do strange things with their heating/ventilation/AC system, for example turning it off completely and opening windows.

Now you know that the solution is not too difficult.

Simon

Jan,
If you have a silver resistor on your fan then you need to check if the resistor has failed - you need to do the "demist test" to checkwhether your slow speed fan is working or not - if the fan is not working you need to buy the upgraded gold resistor which you can get on E-bay.

Met beste wensen

Tenesmus · 16th June 2019, 17:06

Do these fan problems show up on a T4 etc?

SD1too · 16th June 2019, 17:43

Quote:

Originally Posted by ferser1

... i saw a golden coloured rectangular component there ... but are you referring to this component? Where can i buy a new one?

Yes I am referring to that component but the gold version has a higher power rating making it more reliable. They are available from club trader Jules or e-bay.

I think some investigation is wise before buying anything. The control box isn't available on its own unless you buy second hand. A garage would normally fit a new MGR motor and control box assembly which is very expensive.

Quote:

Originally Posted by Tenesmus

Do these fan problems show up on a T4 etc?

T4 will confirm which speeds are not working. It seems that Jan's slow speed has failed since the fan does not run when AC is active, so I'm not sure what benefit T4 would bring.

Simon

ferser1 · 26th June 2019, 15:07

I was just thinking, how could i tell that the problem is either the resistor or control box without replacing the parts / buying(and so testing/excluding/verifying if that was the problem)

SD1too · 26th June 2019, 16:29

Quote:

Originally Posted by ferser1

I was just thinking, how could i tell that the problem is either the resistor or control box without replacing the parts ...

What you need to do Jan is find out how this manual switch has been wired. It may well be that the control box and/or resistor have been wired out of circuit. On the other hand the gold resistor may be open circuit, but that's unusual.
To do this, remove the bumper which will give you access to everything. Take a photo of any suspicious wiring and post it on this thread. Good luck!

Simon

Mike Noc · 26th June 2019, 17:57

Sounds like the control circuit has failed and been bypassed - easier to replace a failed resistor than bypass it.

As Simon mentioned, whip the bumper off, trace the wiring from the switch, open the control box, take some photos and post them up on here and hopefully we can tell you what has been done and how to rectify it.

16th June 2019, 14:21	#1
ferser1 Newbie Rover 75 Saloon Join Date: Sep 2018 Location: ROTTERDAM Posts: 13 Thanks: 1 Thanked 4 Times in 1 Post	Fan switch built in ??? Dear members I have a CDT 2.0 from 2005 and i noticed that one of the previous owners have built in a switch behind the steering wheel that operates the fan that cools off the radiator. So when i pull the switch (yeah its a pull switch) the fan spins which i believe is on the highest mode. I also noticed that the airconditionin only blows cold air at idling when i switched on AC and when i switch on the fan manually. When i switch only AC on, the radiatorfan does not spin when idling The engine temperature stays at 90 steady all the time ,driving or when idle. Now this is a huge hassle, turning on and off the fan at each idle moment, i would like to fix this so that it operates at is should and not manual. I wonder what caused this situation that the previous owner needed to build in such solution. How could i troubleshoot this problem??. I plan to go for holiday and this situation would not be ideal really.. Thanks

16th June 2019, 15:41	#2
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,337 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hi Jan, Your radiator fan's slow speed has failed. On a 2005 car the cause will almost certainly be a failed resistor. If you look through the radiator grille at about the two o'clock position, can you see a silver rectangular component with a wire at each end? That's the resistor. The manual switch could have been installed for a number of reasons: The owner may not have liked a garage's quote to renew the fan motor and control box (several hundred pounds). The owner may not have known that such a simple remedy is available. The owner may have been DIY minded but not keen on this particular repair. Some people do strange things with their heating/ventilation/AC system, for example turning it off completely and opening windows. Now you know that the solution is not too difficult. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

16th June 2019, 17:06	#5
Tenesmus Loves to post Rover 75 Tourer Join Date: Nov 2014 Location: Penzance Posts: 481 Thanks: 17 Thanked 69 Times in 52 Posts	Do these fan problems show up on a T4 etc? __________________ 2005 Connoisseur 2.5 auto SE Tourer in BRG with Sandstone Beige and Black piping interior (the 2nd of only 7 Rover 75s produced 5th November 2004, and it’s the 244th of 303 facelift British Racing Green 75 tourers built worldwide). All I've done is add Rover walnut gear knob and handbrake... 2016 Vauxhall Viva SL (Father Jack) "assisted manual" (auto) in purple. Going rusty underneath already...

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26th June 2019, 15:07	#7
ferser1 Newbie Rover 75 Saloon Join Date: Sep 2018 Location: ROTTERDAM Posts: 13 Thanks: 1 Thanked 4 Times in 1 Post	I was just thinking, how could i tell that the problem is either the resistor or control box without replacing the parts / buying(and so testing/excluding/verifying if that was the problem)

26th June 2019, 17:57	#9
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,546 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Sounds like the control circuit has failed and been bypassed - easier to replace a failed resistor than bypass it. As Simon mentioned, whip the bumper off, trace the wiring from the switch, open the control box, take some photos and post them up on here and hopefully we can tell you what has been done and how to rectify it.