Fan operation

kiwijason · 21st September 2009, 07:45

I have a rover 75 53 plate 1.8T tourer, the fan has no resister fitted but I do find when the air con is selected the fan is constantly on full speed. Would replacing the brushes fix this or should I look at the relay (not sure where this is located) ? I am also worried about the taking the fan motor apart and finding the stator worn out, what is the likely hood of this if the car has done 55k miles?

drewbie · 22nd September 2009, 14:42

I have the same fan unit as you, older type 2 speed fan, and there is very little info about them on the forum. It could be the brushes or the relay, either way the front bumper has to come off.

sf8752 · 22nd September 2009, 14:53

how do you know fan is on full speed so as i can check mine

steve..

Paul H · 22nd September 2009, 15:20

Trust me you will know when it is running on full speed it sounds like a plane taking off.

T-Cut · 22nd September 2009, 15:35

Quote:

Originally Posted by kiwijason

- - I do find when the air con is selected the fan is constantly on full speed.

The fan should certainly run continuously, but at the low speed. Do you know it's the fast speed, or do you assume it is from the sound? The slow speed on the K18s is still pretty noisy.

Quote:

Would replacing the brushes fix this or should I look at the relay (not sure where this is located)?

If the motor brushes had worn out, the fan would run at the genuine fast speed, but cycle on-off-on every few seconds. If it's not doing that, the motor is probably fine.

Quote:

I am also worried about the taking the fan motor apart and finding the stator worn out, what is the likely hood of this if the car has done 55k miles?

The slow speed brush issue is prevalent in the 3-speed system fitted to the V6. The K18 always had a 2-speed version, with or without the resistor and I suspect it suffers far less from brush wear. From my readings, it seems that this particular question is rarely mentioned.

TC

stocktake · 22nd September 2009, 15:41

From what I have seen with an old two speed resistor free 1.8 fan that sat in my shed for a while:

The two speed 1.8 fan with NO resistor has very little noticable difference in either of the speeds. I would suggest if your fan runs when you call for the aircon, your fan is correct

kiwijason · 22nd September 2009, 21:11

it is very loud when the air con is on, you can defiantly hear the car coming. gives the car a sense of presents

21st September 2009, 07:45	#1
kiwijason Regular poster Rover 75 Tourer 1.8T Join Date: Mar 2009 Location: Edinburgh Posts: 47 Thanks: 0 Thanked 0 Times in 0 Posts	Fan operation I have a rover 75 53 plate 1.8T tourer, the fan has no resister fitted but I do find when the air con is selected the fan is constantly on full speed. Would replacing the brushes fix this or should I look at the relay (not sure where this is located) ? I am also worried about the taking the fan motor apart and finding the stator worn out, what is the likely hood of this if the car has done 55k miles?

22nd September 2009, 15:41	#6
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,591 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	From what I have seen with an old two speed resistor free 1.8 fan that sat in my shed for a while: The two speed 1.8 fan with NO resistor has very little noticable difference in either of the speeds. I would suggest if your fan runs when you call for the aircon, your fan is correct __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

22nd September 2009, 14:42	#2
drewbie Loves to post Rover 75 Club SE 1.8T 03 plate. Join Date: Jan 2009 Location: Tenterden Posts: 277 Thanks: 28 Thanked 41 Times in 37 Posts	I have the same fan unit as you, older type 2 speed fan, and there is very little info about them on the forum. It could be the brushes or the relay, either way the front bumper has to come off.

22nd September 2009, 14:53	#3
sf8752 Gets stuck in rover75 conny 1.8 white gold Join Date: May 2007 Location: liverpool Posts: 509 Thanks: 0 Thanked 0 Times in 0 Posts	how do you know fan is on full speed so as i can check mine steve..

22nd September 2009, 15:20	#4
Paul H Avid contributor MG ZT 160+ Turbo. MG TF 135 Join Date: May 2008 Location: Livingston Posts: 169 Thanks: 0 Thanked 0 Times in 0 Posts	Trust me you will know when it is running on full speed it sounds like a plane taking off.

22nd September 2009, 21:11	#7
kiwijason Regular poster Rover 75 Tourer 1.8T Join Date: Mar 2009 Location: Edinburgh Posts: 47 Thanks: 0 Thanked 0 Times in 0 Posts	it is very loud when the air con is on, you can defiantly hear the car coming. gives the car a sense of presents