Radiator fan

D j martin · 8th March 2021, 12:55

Just got a rover 75 1.8 & noticed the radiator fan is on all the time, seen other post about air con turned on etc. But very confused by it all is there any simple test that can be done

suzublu · 8th March 2021, 14:40

Sounds like one of the speed resistor has failed. With the aircon off, start the car and press the demist button. If the fan doesn't come on, then the low speed has failed.

Sent from my moto g(7) power using Tapatalk

SD1too · 8th March 2021, 14:49

Hello Derek and

to the club and to Rover 75 ownership.

Basically the radiator fan should operate continuously whenever the air conditioning is running. With a few rare exceptions, this is whenever you have 'Auto' mode selected on your heater/air con. control panel.

The simple test you've requested is to press the 'Econ' button on the heater/air con. panel. If the fan continues to run then it will be cooling the engine. After a minute or two it should stop. If it doesn't, you may have a problem.

I hope this clarifies and please come back if you have more questions.

Simon

trikey · 8th March 2021, 14:49

Does it run with the aircon turned off?

D j martin · 8th March 2021, 16:43

Hi thanks for all your reply’s have now worked out what I was doing wrong (only ever had a car with couple of knobs to turn) got the fan to go off, now have to find out when we can actually go out & give it a good run to see if it all works :duh

Yorkshire GOC · 8th March 2021, 17:03

At least your sorted.

As you are the new owner of a 1.8 always check the slow speed fan is working - known as the "demist test" to make sure the resistor has not failed. As advised at post 2 by Suzublu.

The original silver fan (11 o clock on the fan mounting as you look through the RHS of your grill) resistor is a fail point and most folk upgrade to the more reliable gold resistor ( you will see them being sold on E bay )

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

D j martin · 8th March 2021, 17:06

Thanks ok will have a look at that as nowadays got plenty of time

8th March 2021, 12:55	#1
D j martin Newbie Rover75 saloon Join Date: Jan 2021 Location: Essex Posts: 21 Thanks: 2 Thanked 0 Times in 0 Posts	Radiator fan Just got a rover 75 1.8 & noticed the radiator fan is on all the time, seen other post about air con turned on etc. But very confused by it all is there any simple test that can be done

8th March 2021, 14:49	#3
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: 20,338 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hello Derek and to the club and to Rover 75 ownership. Basically the radiator fan should operate continuously whenever the air conditioning is running. With a few rare exceptions, this is whenever you have 'Auto' mode selected on your heater/air con. control panel. The simple test you've requested is to press the 'Econ' button on the heater/air con. panel. If the fan continues to run then it will be cooling the engine. After a minute or two it should stop. If it doesn't, you may have a problem. I hope this clarifies and please come back if you have more questions. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

8th March 2021, 14:49	#4
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,760 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Does it run with the aircon turned off? __________________ Lest we forget..

8th March 2021, 16:43	#5
D j martin Newbie Rover75 saloon Join Date: Jan 2021 Location: Essex Posts: 21 Thanks: 2 Thanked 0 Times in 0 Posts	Radiator fan Hi thanks for all your reply’s have now worked out what I was doing wrong (only ever had a car with couple of knobs to turn) got the fan to go off, now have to find out when we can actually go out & give it a good run to see if it all works :duh

8th March 2021, 17:03	#6
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,062 Thanks: 1,842 Thanked 623 Times in 469 Posts	At least your sorted. As you are the new owner of a 1.8 always check the slow speed fan is working - known as the "demist test" to make sure the resistor has not failed. As advised at post 2 by Suzublu. The original silver fan (11 o clock on the fan mounting as you look through the RHS of your grill) resistor is a fail point and most folk upgrade to the more reliable gold resistor ( you will see them being sold on E bay ) https://www.ebay.co.uk/itm/Rover-75-...UAAOSwraRfBZKt __________________ 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.

8th March 2021, 14:40	#2
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,911 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	Sounds like one of the speed resistor has failed. With the aircon off, start the car and press the demist button. If the fan doesn't come on, then the low speed has failed. Sent from my moto g(7) power using Tapatalk

8th March 2021, 17:06	#7
D j martin Newbie Rover75 saloon Join Date: Jan 2021 Location: Essex Posts: 21 Thanks: 2 Thanked 0 Times in 0 Posts	Rad fan Thanks ok will have a look at that as nowadays got plenty of time

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