105 degrees to 107 fan starts

danbax · 13th May 2018, 10:52

This is not good I know
So I'm intending on selling this car asap if I can
It's a shame cause it's soooo comfortable and in mint condition for 140 years old
Well except for where my herd of elephants have been through the back and side it's just dirty and full of rubbish where I sit .

T-Cut · 13th May 2018, 11:07

The KV6 fan should first trip on at 100C or so. It seems like the low speed fan system has packed up. I'd expect a 2004 model to have the later 2-speed fan, so it's probably due to a failed slow speed resistor. Easy to check and easy to fix if that's why you mention it.

A 140 year old is worth preserving!

TC

danbax · 13th May 2018, 11:15

[QUOTE=T-Cut;2629757]The KV6 fan should first trip on at 100C or so. It seems like the low speed fan system has packed up. I'd expect a 2004 model to have the later 2-speed fan, so it's probably due to a failed slow speed resistor. Easy to check and easy to fix if that's why you mention it.

A 140 year old is worth preserving!

My sheds not big enough to fit her in to preserve longer so am afraid will rust to death
If I continue to use possible outcomes continued driving rarely passes 107 degrees

What rating resistor is required and which wires do I put it on now that you mention it

Thanks

Yorkshire GOC · 13th May 2018, 14:52

This is what you want if you have a 2 speed fan - however you want to check if the low speed has failed - do the demist test - switch demister on - go to front of car and look through grille at RHS - you will see if your fan is working or not. If it is not turning then replace the existing silver resistor with the gold one on the link below - its an improvement on the OEM resistor .

https://www.ebay.co.uk/itm/Rover-75-...wAAOSwJtdaJq0u

danbax · 13th May 2018, 17:45

Quote:

Originally Posted by Yorkshire GOC

This is what you want if you have a 2 speed fan - however you want to check if the low speed has failed - do the demist test - switch demister on - go to front of car and look through grille at RHS - you will see if your fan is working or not. If it is not turning then replace the existing silver resistor with the gold one on the link below - its an improvement on the OEM resistor .

https://www.ebay.co.uk/itm/Rover-75-...wAAOSwJtdaJq0u

Seems a little expensive that one ....
Demise doesn't work fan
Where's Marina Brian when ya need him

HarryM1BYT · 13th May 2018, 19:14

Quote:

Originally Posted by danbax

Seems a little expensive that one ....
Demise doesn't work fan
Where's Marina Brian when ya need him

If you look in through the front grill, you may see a discoloured silver object, with a wire coming out at each end - that is the original resistor. The originals were never quite adequate, for the heat dissipation needed for the job, hence the burnt out. A higher wattage version is needed to be installed. These are usually gold coloured. From memory - the resistor needs to be 100w 0.47 Ohms - that is zero point four seven. A bit less than 1/2 of a Ohm. You can get such items from many sources, but best to ensure the source is a reliable one, you don't want to be doing the job twice. Farnell; CPC..

The bumper needs to be removed to install it and the wire connections need to be good ones, they carry a large current.

Yorkshire GOC · 13th May 2018, 20:08

Quote:

Originally Posted by danbax

Seems a little expensive that one ....
Demise doesn't work fan
Where's Marina Brian when ya need him

Not sure what you mean by expensive for a resistor with easy fixing ??? However if your fan does not work on the demist setting then your low speed has failed and if it is a 2 speed fan it is invariably a resistor failure hence the need to swop out the silver one for the gold one.

SD1too · 13th May 2018, 21:40

Quote:

Originally Posted by danbax

Demist doesn't work fan

Dan, before we jump to conclusions can you tell us whether you have a 2 or 3 speed fan. Which do you have, the first picture or the second?

Simon

danbax · 14th May 2018, 23:06

definately the 1st one with heat sink with resistor in
wouldnt mind i bought one of these for my last mg and didnt need it cant remember what i did with it...and it was less than 15 quid for a resistor

SD1too · 15th May 2018, 07:23

Quote:

Originally Posted by danbax

definately the 1st one with heat sink with resistor in ...

Thanks Dan. In which case you should have a 2 speed system. With a failed resistor the fast speed should run at a coolant temperature of 112 degrees. However you have reported that the fan operates between 105 and 107 degrees.

Are you using the instrument pack diagnostics to determine coolant temperature?
Is your engine a V6?
Has any previous work been done on the fan system?

Simon

13th May 2018, 10:52	#1
danbax Avid contributor rover 75 Join Date: Apr 2013 Location: newcastle Posts: 141 Thanks: 14 Thanked 2 Times in 2 Posts	105 degrees to 107 fan starts This is not good I know So I'm intending on selling this car asap if I can It's a shame cause it's soooo comfortable and in mint condition for 140 years old Well except for where my herd of elephants have been through the back and side it's just dirty and full of rubbish where I sit . __________________ What to you call an Geordie egyiption carpenter Ah-med a-shed.

13th May 2018, 11:15	#3
danbax Avid contributor rover 75 Join Date: Apr 2013 Location: newcastle Posts: 141 Thanks: 14 Thanked 2 Times in 2 Posts	Continued use without slow speed fan? [QUOTE=T-Cut;2629757]The KV6 fan should first trip on at 100C or so. It seems like the low speed fan system has packed up. I'd expect a 2004 model to have the later 2-speed fan, so it's probably due to a failed slow speed resistor. Easy to check and easy to fix if that's why you mention it. A 140 year old is worth preserving! My sheds not big enough to fit her in to preserve longer so am afraid will rust to death If I continue to use possible outcomes continued driving rarely passes 107 degrees What rating resistor is required and which wires do I put it on now that you mention it Thanks __________________ What to you call an Geordie egyiption carpenter Ah-med a-shed.

13th May 2018, 14:52	#4
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,074 Thanks: 1,842 Thanked 623 Times in 469 Posts	This is what you want if you have a 2 speed fan - however you want to check if the low speed has failed - do the demist test - switch demister on - go to front of car and look through grille at RHS - you will see if your fan is working or not. If it is not turning then replace the existing silver resistor with the gold one on the link below - its an improvement on the OEM resistor . https://www.ebay.co.uk/itm/Rover-75-...wAAOSwJtdaJq0u __________________ 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.

14th May 2018, 23:06	#9
danbax Avid contributor rover 75 Join Date: Apr 2013 Location: newcastle Posts: 141 Thanks: 14 Thanked 2 Times in 2 Posts	definately the 1st one with heat sink with resistor in wouldnt mind i bought one of these for my last mg and didnt need it cant remember what i did with it...and it was less than 15 quid for a resistor __________________ What to you call an Geordie egyiption carpenter Ah-med a-shed.

13th May 2018, 11:07	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The KV6 fan should first trip on at 100C or so. It seems like the low speed fan system has packed up. I'd expect a 2004 model to have the later 2-speed fan, so it's probably due to a failed slow speed resistor. Easy to check and easy to fix if that's why you mention it. A 140 year old is worth preserving! TC