Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 2nd February 2020, 21:11   #1
super s
Gets stuck in
 
mg

Join Date: Jun 2015
Location: porto
Posts: 542
Thanks: 134
Thanked 40 Times in 37 Posts
Default fan never works

hello...

can someone please ensure where my problem lies???

my fan never works, i hear the motor sometimes making a buzz after shutting the engine off for 10 seconds or so.

but never see the fan acctually working...

can anyone advice me where the problem lies exaqly???

thanks to all
super s is offline   Reply With Quote
Old 3rd February 2020, 10:01   #2
Yorkshire GOC
I really should get out more.......
 
Yorkshire GOC's Avatar
 
Rover 75 connoisseur se v6 auto

Join Date: May 2014
Location: Hull
Posts: 2,058
Thanks: 1,842
Thanked 623 Times in 469 Posts
Default

Will depend if you have a 2 speed or earlier 3 speed fan -

go to the front of the car - look through the grill to the right and see if on front of the fan to see if you have silver resistor (6cm's long) - this will indicate a 2 speed fan and if the silver resistor has failed you need to replace it with an upgraded Gold resistor (10-15 euros) - to confirm - do this

Start from cold. Put air con to "ECON" and turn on front screen demist. Nip round the front and have a look through the grille to see if the fan is permanently turning. If not it's probably time for a new upgraded gold resistor.

https://www.dmgrs.co.uk/products/rov...64fde3e6&_ss=r

If no resistor on your fan then it is likely to be an earlier 3 speed fan and it is probably a failure of the brushes - 20 euro fix

https://www.ebay.co.uk/itm/Rover-75-...-/253458854588
__________________
She came off the Longbridge Line on 20-05-2003

The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
Yorkshire GOC is offline   Reply With Quote
Old 3rd February 2020, 10:29   #3
Arctic
Give to Learn
 
Arctic's Avatar
 
Freelander 2

Join Date: Aug 2010
Location: West Midlands
Posts: 18,651
Thanks: 1,155
Thanked 6,407 Times in 3,874 Posts
Default

[QUOTE]
Quote:
Originally Posted by super s View Post
hello...

can someone please ensure where my problem lies???

my fan never works, i hear the motor sometimes making a buzz after shutting the engine off for 10 seconds or so.

but never see the fan acctually working...

can anyone advice me where the problem lies exaqly???

thanks to all[/QUOT
E]

Hi Sergio.
As above first find out which fan you have by looking through the front grill at about 14.00pm, with the engine not running you can insert a long screw driver to turn the fan blade to the required position, this will allow you to use a torch shine it into the area you will see either a silver resistor.

Which is a two speed fan.
1

No resistor in place will be a four wire three speed fan.
2

To do the demist test make sure all the A/C is in the of position, turn the ignition key to II without starting the car (Diesel) then press demist button look through the front grill to see if the fan is running continually.

If the fan is not running and you have a silver resistor in place replace this with a gold one the fan should work.
3

If not working and no resistor then you need to either replace the fan, or replace the brushes in the fan motor you will not know this until the fan is removed from the car and the motor opened up.
4

5

https://www.ecp.co.uk/rover75-carbon-brushes.php
__________________
Arctic
Givology Learn to Give
Everything is Achievable

ad altiora tendo.

Check out our Nano meet dates
http://www.midlandsnanomeets.co.uk/

http://www.the75andztclub.co.uk/index.php?thepage=howto

" You do the work , we supply the expertise "

Last edited by Arctic; 3rd February 2020 at 10:32..
Arctic is offline   Reply With Quote
Old 3rd February 2020, 13:18   #4
RoverP480
Gets stuck in
 
None at the moment

Join Date: Jan 2018
Location: Hereford
Posts: 501
Thanks: 1
Thanked 165 Times in 146 Posts
Default

Check that the fan has not seized & cannot turn
RoverP480 is offline   Reply With Quote
Old 10th February 2020, 21:37   #5
super s
Gets stuck in
 
mg

Join Date: Jun 2015
Location: porto
Posts: 542
Thanks: 134
Thanked 40 Times in 37 Posts
Default

before answering want to say thanks for all the income... sorry for the time without answering but the job is taking me apart before the car...

the fan has the silver resistor, so its the 2 speed one...

i will replace the resistor for the gold one has the lonk above from dmgrs...

then will leave here the news...

just another question; as any of you experienced a situation where you stop the car and engine and you hear the fan motor working for a few seconds, maybe 10 seconds or so???

thanks.
super s is offline   Reply With Quote
Old 10th February 2020, 22:51   #6
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,751
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
Default

Quote:
Originally Posted by super s View Post
my fan never works, i hear the motor sometimes making a buzz after shutting the engine off for 10 seconds or so, but never see the fan acctually working.
Hello Sergio,
You said your fan never works, however the diesel rarely needs the fan for engine cooling. The aircon system uses the low speed fan far more often, so have you confirmed it doesn't operate when the aircon is switched on? This can be checked by running the Demist Test. Realistically it's quite likely that the original resistor you see has indeed failed because they are under-powered.

Quote:
Originally Posted by super s View Post
any of you experienced a situation where you stop the car and engine and you hear the fan motor working for a few seconds, maybe 10 seconds or so???
Are you sure this is the radiator fan motor you hear? If it buzzes but doesn't turn, then something is preventing it or perhaps the blades have separated from the motor?
If the low speed resistor has indeed failed, then you must be hearing the high speed. which is an unusual behaviour for a diesel fan. However, the diesel's control system is different from the others. It uses a printed circuit board that's known to be problematic. Strange behaviour of the diesel fan motor could suggest the circuit board needs fixing.

There seems to be several things to consider. Does the motor actually turn or is the buzzing caused by a seized bearing, etc? The low speed system will require an uprated ('Gold') resistor (forum traders, eBay, etc) which will then enable you to run more tests to verify if the circuit board is operating correctly.

TC
T-Cut is offline   Reply With Quote
Old 10th February 2020, 23:09   #7
macafee2
This is my second home
 
Rover 75 Saloon & Tourer

Join Date: Sep 2012
Location: Lincoln
Posts: 14,890
Thanks: 1,630
Thanked 3,032 Times in 2,181 Posts
Default

that buzz, does it sound like radio interference? I get this when I turn my ignition off.
For the life of me I cant recall what it is but I was told a few years ago.
Is it vents closing?

macafee2
macafee2 is offline   Reply With Quote
Old 21st October 2020, 14:54   #8
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,711
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

Check to see if there is any damage to the fixing, it’s a 15mm nut to reattach the fan, put it on the spindle and give it 1/4 turn.


Sent from my iPhone using Tapatalk
__________________
Lest we forget..
trikey is offline   Reply With Quote
Old 21st October 2020, 21:23   #9
Arctic
Give to Learn
 
Arctic's Avatar
 
Freelander 2

Join Date: Aug 2010
Location: West Midlands
Posts: 18,651
Thanks: 1,155
Thanked 6,407 Times in 3,874 Posts
Default

Quote:
Quote:
Originally Posted by trikey View Post
Check to see if there is any damage to the fixing, it’s a 15mm nut to reattach the fan, put it on the spindle and give it 1/4 turn.


Sent from my iPhone using Tapatalk
First job is remove the front bumper.


As Andy says above check that the fan blade as no damage, and if it can be fitted back you will need a thin wall 15 socket.
1

2

check the lugs on the inside of the blade, pointed out by the dots in the photo.
3

Removing the crash bar will help you gain more access.
4

remove 4 bolts and one nut either side.
5

6

7
__________________
Arctic
Givology Learn to Give
Everything is Achievable

ad altiora tendo.

Check out our Nano meet dates
http://www.midlandsnanomeets.co.uk/

http://www.the75andztclub.co.uk/index.php?thepage=howto

" You do the work , we supply the expertise "
Arctic is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:16.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd