R50 Auto over heating - MINI Cooper Forum

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post #1 of 4 (permalink) Old Jan 17th, 2014, 07:25 AM Thread Starter
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R50 Auto over heating

Hello Guys,

Hope you can help me :
Wifeís í02 cooper auto started smelling rubbery when hot a while ago. Checked everything and all seemed OK , temp gauge didnít show hot and heater worked ok etc . So assumed it was old'ish hoses smell.
Eventually got call , heater not working ! Had run out of water so refilled and took into garage . They ended up replacing radiator , fans assy. , resistor block and head gasket with re-skim. All seemed OK after . They told me that the fault it had meant that the overheating didnít show up via the temp gauge .
Now the car is still smelling rubbery when in traffic again although the temp gauge is OK and heater is fine. Only happened yesterday and so havenít had a chance to check out fans are working. The 1st repair was in November last year.
But question is : is it true that the gauge may not be trusted with some faults ?

I donít want to be shelling out again for an í02 car Ö

Thanks
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post #2 of 4 (permalink) Old Jan 17th, 2014, 06:44 PM
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The gauge is not very accurate, many cars don't even have a gauge as most modern drivers are not expected to understand what it means anymore.....

"The temperature gauge on modern cars like the Mini are controlled by the ECU...and does not necessarily tell you when the engine is overheating. When the engine is started from cold the ECU will push the gauge up in unison with the coolant temp, HOWEVER!.....when the gauge reaches 'N' or midway the ECU holds the gauge at that reading unless the engine gets exceptionally overheated by which time it is usually too late. It is what's commonly referred to as a phoney gauge. Lot's of cars these days have such gauges, many new cars don't have a temp gauge at all.......just a warning to stop when overheating is serious."

The philosophy is, basically: "we don't want the owner to know or worry about how hot the engine is most of the time, we'll decide what is within the normal range".

Also once the water has all boiled away to steam or leaked away, the eng temp sensor can't signal it is overheating as there is no liquid in the cooling system to give a gauge reading.

Not sure what is causing the rubbery smell but it should be investigated, rubber aux drive belt slipping and getting hot perhaps? also check water pump drive pulley is turning freely with belt?

Diagrams:
http://www.realoem.com/bmw/showparts...99&hg=11&fg=35
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post #3 of 4 (permalink) Old Jan 17th, 2014, 07:54 PM Thread Starter
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Thanks for that. I am gonna check fans tomorrow. And water level. I really like the Mini ,so much better on the road than my Audi A1 . Gonna think about chopping in for a new shape Cooper in the summer. New 1.5 3 cylinder seems like a good engine.
Phil
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post #4 of 4 (permalink) Old Mar 5th, 2014, 02:23 AM
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The water temp sensor fails to tell the cooling fan to turn on. It's a duel function switch. It's located in the head on the right, just behind the thermostats housing, very common fault.
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