Engine Fan

Shaker · 2nd November 2019, 14:34

Hi, can anyone help me with this one before I get to deep. My Kv6 Connie's fan keeps coming on while driving,a couple of weeks ago on a weekend away it stayed on even after checking in at the hotel getting changed etc came down still going. I managed to disconnect the battery until the morning. Reconnected it and all was fine for about 3 weeks until, coming home from work yesterday when it was on all the time, got home still running, so disconnected the battery again. This morning a soon as I connected the battery it started again and hasn't stopped. I've just swapped the resistor for the gold one and its still running. So my question is, before I start stripping the fan off a parts car, is the fan on the Connie goosed and needs replacing or is there anything else I can try? Thanks.

vitesse · 2nd November 2019, 14:47

Sounds like a relay sticking inside the control box, not much fun to get at as the whole front has to come off.

Hopefully Arctic, or Stocktake might have a better idea than my guess.

Regards

Shaker · 2nd November 2019, 15:34

thanks vitesse, I'll wait and see if they have any suggestions. I don't want to go to the trouble of stripping the fan from the parts car to find it doesn't cure it.

T-Cut · 2nd November 2019, 16:26

The fan motor has a permanently-on live feed. Switching is achieved via relays on the earth side. A sticking-on or faulty relay will certainly cause the fan to run without the ignition being on. Your description of events suggest this is the likely cause. Of course, the relay may be activated through a fault in the control side. To 'stick on', the relay has to be activated first. Swapping with a new one should give you a clue.

TC

Shaker · 2nd November 2019, 16:47

Thanks TC
are these the relays that are in the fan assembly or the one in the fuse box?
Sorry if thats a basic question but I'm no sparky and fortunately my MGR's haven't had many faults so ever had to search for components.

T-Cut · 2nd November 2019, 16:55

The relays switching the fan on are in the plastic control box mounted behind the fan guard/frame on the nearside.

Is your fan a 3-speed or a resistor moderated 2-speed? The latter has a silver or gold coloured resistor mounted on the frame behind the fan blades. Look through the blades in the 2 o'clock position.

You'll find everything you need to know somewhere on the forum, once it's clear where the problem is.

TC

2nd November 2019, 14:34	#1
Shaker Avid contributor ZT 260 SE, ZT-T 135+, ZT 160+1.8T, ZS180, ZR115+, 07 2.5 Connie SE Join Date: Jun 2008 Location: Macclesfield Posts: 183 Thanks: 27 Thanked 7 Times in 7 Posts	Engine Fan Hi, can anyone help me with this one before I get to deep. My Kv6 Connie's fan keeps coming on while driving,a couple of weeks ago on a weekend away it stayed on even after checking in at the hotel getting changed etc came down still going. I managed to disconnect the battery until the morning. Reconnected it and all was fine for about 3 weeks until, coming home from work yesterday when it was on all the time, got home still running, so disconnected the battery again. This morning a soon as I connected the battery it started again and hasn't stopped. I've just swapped the resistor for the gold one and its still running. So my question is, before I start stripping the fan off a parts car, is the fan on the Connie goosed and needs replacing or is there anything else I can try? Thanks. __________________ V8.... Everything else is just a toy!!! Last edited by Shaker; 2nd November 2019 at 14:37..

2nd November 2019, 15:34	#3
Shaker Avid contributor ZT 260 SE, ZT-T 135+, ZT 160+1.8T, ZS180, ZR115+, 07 2.5 Connie SE Join Date: Jun 2008 Location: Macclesfield Posts: 183 Thanks: 27 Thanked 7 Times in 7 Posts	thanks vitesse, I'll wait and see if they have any suggestions. I don't want to go to the trouble of stripping the fan from the parts car to find it doesn't cure it. __________________ V8.... Everything else is just a toy!!!

2nd November 2019, 16:47	#5
Shaker Avid contributor ZT 260 SE, ZT-T 135+, ZT 160+1.8T, ZS180, ZR115+, 07 2.5 Connie SE Join Date: Jun 2008 Location: Macclesfield Posts: 183 Thanks: 27 Thanked 7 Times in 7 Posts	Thanks TC are these the relays that are in the fan assembly or the one in the fuse box? Sorry if thats a basic question but I'm no sparky and fortunately my MGR's haven't had many faults so ever had to search for components. __________________ V8.... Everything else is just a toy!!!

2nd November 2019, 14:47	#2
vitesse I really should get out more....... Rover 75 Saloon Join Date: Jul 2011 Location: Gävle Posts: 2,537 Thanks: 395 Thanked 823 Times in 652 Posts	Sounds like a relay sticking inside the control box, not much fun to get at as the whole front has to come off. Hopefully Arctic, or Stocktake might have a better idea than my guess. Regards

2nd November 2019, 16:26	#4
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 fan motor has a permanently-on live feed. Switching is achieved via relays on the earth side. A sticking-on or faulty relay will certainly cause the fan to run without the ignition being on. Your description of events suggest this is the likely cause. Of course, the relay may be activated through a fault in the control side. To 'stick on', the relay has to be activated first. Swapping with a new one should give you a clue. TC

2nd November 2019, 16:55	#6
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The relays switching the fan on are in the plastic control box mounted behind the fan guard/frame on the nearside. Is your fan a 3-speed or a resistor moderated 2-speed? The latter has a silver or gold coloured resistor mounted on the frame behind the fan blades. Look through the blades in the 2 o'clock position. You'll find everything you need to know somewhere on the forum, once it's clear where the problem is. TC