Rover 75 Con SE 2.0 CDTi - Radiator Cooling Fan Always On - Page 2

Arctic · 31st March 2024, 10:47

Quote:

Originally Posted by cashford

Hi

Front of the car off... I didn't have to do battle with too many rusty screws/bolts, indeed I have to sat I was really surprised at how little rust there is around the front end.

Anyway, I have got access to the relay/PCB box and it looks like I have the four wire 3 speed fan and deffo no resistor on the fan housing. It all looks really clean, no obvious signs of water ingress and the multiplug connectors on the near side were also really clean and dry but I sprayed some electrical contact cleaner all over them anyway.

I realise I can't see anything by looking at it, so I guess my question is now, where do I go from here. Do I assume it is he PCB that is faulty and try and source one?

I can't work out how to attached photos to my post :-(

Thanks all again for all your help, especially the 'how to guide' for removing the front end.. I would never have done it without that... Just somehow need to get it back together again Eeek!

HI Charles.
received your PM and will contact you later today with regards to the relay's and PCB

cashford · 31st March 2024, 16:09

Brilliant, thanks Arctic

Arctic · 3rd April 2024, 23:15

Quote:

Originally Posted by cashford

Brilliant, thanks Arctic

Hi Charles.
It's been great talking to you on the phone, below are few photos of how to remove and refit the front bumper, make sure that the front edge pops into the yellow nib by a quick tap with your palm.

1

2

The side should just be slightly bent in then it should pop into place making it flush.

3

4

5

6

cashford · 5th April 2024, 09:22

Hi

Thanks Arctic, and thank you so much for all your help.

With all your support the issue is now fixed. To help others.....

It seems I have the 3 speed 4 wire fan and the issue was the larger of the three (low speed I believe) relay in the fan PCB/Relay box.

A really easy swap out but only thanks to the amazing support of Arctic and loads of photos (and the spare part he had!)

Also a big thanks to the how to guides on here on taking the car apart to get to the box... First time for me taking it apart but made much simpler with the guides.

Charles

SD1too · 5th April 2024, 14:09

Quote:

Originally Posted by cashford

... the issue was the larger of the three (low speed I believe) relay in the fan PCB/Relay box.

Thanks for posting the outcome Charles. It's very unexpected. Are you saying that all you did was to remove the large relay and replace it with another supplied by Arctic?

In your first post you reported that the fan stops shortly after switching off the ignition. That's not consistent with a relay failure. I suspect that you may have a poor soldered connection or cracked track on the PCB which was re-made when changing the relay flexed the circuit board. I'd keep it under observation if I were you.

Simon

cashford · 5th April 2024, 15:27

Hi Simon

Yes, absolutely the only thing I did, other than checking the condition of the wiring was replace the larger one of the three relays.... The order was....

1. Disconnect all wires and remove whole box
2. Remove PCB and all relays from the box
3. Loosely reconnect to the car without the box and test.... Result: fault remained
4. Replaced larger relay and test - Result: fixed
5. Replaced PCB and relays in to the box and mounted the box back in the fan housing and tested again. Result: Still all OK
6. Re-assembled the car.

I haven't really been far in the car yet, indeed prob less than 10 miles but so far all is OK, but I totally take on board your point.. I'll keep you all posted.

Charles

31st March 2024, 16:09	#12
cashford Newbie Rover 75 Saloon Join Date: Nov 2023 Location: Bournemouth Posts: 19 Thanks: 0 Thanked 0 Times in 0 Posts	Brilliant, thanks Arctic

5th April 2024, 09:22	#14
cashford Newbie Rover 75 Saloon Join Date: Nov 2023 Location: Bournemouth Posts: 19 Thanks: 0 Thanked 0 Times in 0 Posts	Hi Thanks Arctic, and thank you so much for all your help. With all your support the issue is now fixed. To help others..... It seems I have the 3 speed 4 wire fan and the issue was the larger of the three (low speed I believe) relay in the fan PCB/Relay box. A really easy swap out but only thanks to the amazing support of Arctic and loads of photos (and the spare part he had!) Also a big thanks to the how to guides on here on taking the car apart to get to the box... First time for me taking it apart but made much simpler with the guides. Charles

5th April 2024, 15:27	#16
cashford Newbie Rover 75 Saloon Join Date: Nov 2023 Location: Bournemouth Posts: 19 Thanks: 0 Thanked 0 Times in 0 Posts	Hi Simon Yes, absolutely the only thing I did, other than checking the condition of the wiring was replace the larger one of the three relays.... The order was.... 1. Disconnect all wires and remove whole box 2. Remove PCB and all relays from the box 3. Loosely reconnect to the car without the box and test.... Result: fault remained 4. Replaced larger relay and test - Result: fixed 5. Replaced PCB and relays in to the box and mounted the box back in the fan housing and tested again. Result: Still all OK 6. Re-assembled the car. I haven't really been far in the car yet, indeed prob less than 10 miles but so far all is OK, but I totally take on board your point.. I'll keep you all posted. Charles