(MCS) Problem: Engine Fan Stays On - MINI Cooper Forum

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post #1 of 29 (permalink) Old Jun 4th, 2006, 08:59 PM Thread Starter
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United-Kingdom (MCS) Problem: Engine Fan Stays On

Hey Everyone.

I'm a very recent MCS Owner and i have a bit of a problem.

My engine radiator fan stays on. Not just for 5/10/15 mins.. It stays on constantly no matter what the temp of the engine is.

When i unplug the connector, it obviously turns off. When i plug it back in its back on instantly.

Also, when i disconnect the battery, and connect it back up.. it starts the fan straight back up..

I understand the fan is ECU controlled, and have read on the forums that disconnecting the batterie for 30+ mins should reset it.

Can anyone suggest any fixes for the problem? And roughly how much the part will cost.

Thank you in advanced for any help.

-David
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post #2 of 29 (permalink) Old Jun 4th, 2006, 10:48 PM Thread Starter
Carbon Fibre *drools*
 
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United-Kingdom Update..

Disconnected the battery for an hour, reconnected and as you could of guessed.. fan came straight back on without the car even started.

I understand that after 2003 they changed they way that the radiator fan system works, and at some TLC services they are changing pre-2003 MCS's to the new system.

I still have my TLC book with 1 voucher left, is there any possiblity my local Mini Garage will fix/change the problem part?

-David
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post #3 of 29 (permalink) Old Jun 5th, 2006, 03:25 PM Thread Starter
Carbon Fibre *drools*
 
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Anyone know what part i should be ordering/replacing?

-David
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post #4 of 29 (permalink) Old Jun 6th, 2006, 10:25 AM Thread Starter
Carbon Fibre *drools*
 
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All fixed Nothing a sharp nudge couldn't fix..
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post #5 of 29 (permalink) Old Jun 6th, 2006, 11:23 AM
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Er, just out of interest, what did you nudge?

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post #6 of 29 (permalink) Old Jun 6th, 2006, 05:24 PM
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Right, I had the same problem, ended up having to replace the fan unit completely .

Below are pictures of the part that cause's the problem. You can't buy this part separately, I believe it regulates the speed of the fan.... You can't see this part as its tucked away




Graham
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post #7 of 29 (permalink) Old Jun 6th, 2006, 07:31 PM
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I had the same problem - sharp tap in the centre of the fan cowl (by the above module) sorted it.
The dealer fitted a new assembly & told me the car was ready, when I got there it was in bits they said it didn't cure it. After another day they said the air con system had too much gas in it !!!! never heard of a car gaining gas over the course of a year
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post #8 of 29 (permalink) Old Jun 6th, 2006, 08:46 PM Thread Starter
Carbon Fibre *drools*
 
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Quote:
Originally Posted by Prowse
Er, just out of interest, what did you nudge?
After unplugging the fan, follow the radiator accross to the left while looking at the fan. When you get the end of the fan, give a little tap with your fist to the radiator.

Plug the fan back in, everything works fine

-David
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post #9 of 29 (permalink) Old Mar 18th, 2007, 09:54 AM
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Quote:
Originally Posted by David_MCS View Post
After unplugging the fan, follow the radiator accross to the left while looking at the fan. When you get the end of the fan, give a little tap with your fist to the radiator.

Plug the fan back in, everything works fine

-David
Thanks David......this worked a treat, there must be an underlying problem though.....shouldn't have to hit something to get it to work properly....for now it's a quick fix, so i THANK YOU very much.
I do have one qustion for you though.....how did you work out where to tap??
Cath
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post #10 of 29 (permalink) Old Mar 18th, 2007, 10:46 PM
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this happened to me once on the way to school, it was raining, and I ended up with a dead battery after 3hrs. I had to call the campus police to get a jump start. but that was the only time it happened to me. so I know, where is the plug to the radiator fan?

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post #11 of 29 (permalink) Old Mar 19th, 2007, 01:50 AM
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On an australian mini, plug for the fan is on the right hand side of the radiator as you look at the engine, it's a biggish plug just under/on the edge of the cowling.
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post #12 of 29 (permalink) Old Nov 7th, 2008, 04:37 AM
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Thanks for the fix, I'm off to try it. In a pinch you can always pull the 50 amp fuse to shut the fan off. The fan relay will not do the trick.
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post #13 of 29 (permalink) Old Dec 13th, 2008, 06:27 PM
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It Works!!!

A tap at the black rectagular box behind the radiator did the trick!!!
Amazing!!! Thanks for the tip mate!
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post #14 of 29 (permalink) Old May 10th, 2009, 12:47 AM
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It really does work!

Thanks to all for this thread. Rapping on the cowling at the control box stopped the fan. Now to get the component replaced.
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post #15 of 29 (permalink) Old May 10th, 2009, 05:47 AM
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That big green unit controles fan speed 2. You will also find a relay in there. The green thing is just a big resisitor. In the plug you will have a constant power (allows the fan to be opperated with the ignition is off) The other large wire is the switched wire from the fan control relay. The other smaller wire is the signal wire to activate the relay when the eng is switched on. The relay is a 87 and 87a type and commanly fails burning out and causing the fan to run constantly that is why hitting them turns them off. I will dig up a wiring digram for it as iv seen many minis with this problem.
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