Outside temp reading -40 degrees constantly? - MINI Cooper Forum

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post #1 of 10 (permalink) Old Mar 15th, 2014, 07:17 AM Thread Starter
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Outside temp reading -40 degrees constantly?

Hi all,

I've not long purchased a 2004 (53) Cooper S and I have a couple of issues I would like to get sorted.

The outside temperature display in the rev counter constantly ready -40 degrees. Now I'm assuming somewhere on the car there's a sensor or something that reads the temperature and it's gone wrong. Does anyone know what I need to buy and where I buy it from please?

Many thanks,

Gray.
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post #2 of 10 (permalink) Old Mar 15th, 2014, 07:40 AM
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The temp sensor is behind the front bumper. They read -40 if they are disconnected/broken it might just be a broken wire. The sensor is available from BMW or you should be able to get a 2nd hand one of ebay.
Front bumper is only 5 minutes to remove so easy to take off & have a look
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post #3 of 10 (permalink) Old Mar 15th, 2014, 09:33 AM
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Its a common thing, the garage will remove or drop the front bumper, disconnect the wiring to do work on the engine/radiator etc and then not connect it back up again.
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post #4 of 10 (permalink) Old Jun 17th, 2014, 08:57 PM
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OK so I have this issue also, -40.0 degrees. I have located the sensor but there is no cable/wire connected to it. I've a 2001 mini one. How or where do I start to locate the wire. Thanks
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post #5 of 10 (permalink) Old Oct 3rd, 2014, 11:39 PM
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The wire for that temp sensor is bundled with the wires going to the left side (driver) fog light/ side marker light / horn. It passes through a big opening in the aluminum energy absorber near where the fog light sits.

It is the longest one of the bunch.

On my 2003 MC-S, its two wires - one blue with red stripe, one blue with brown stripe.
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post #6 of 10 (permalink) Old Jan 12th, 2015, 01:40 PM
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Is Temperature Sensor to blame??? SOS!!

Can someone tell me whether or not the temperature sensor has anything to do with the engine overheating and the heater not putting out warm air?

I recently had the clutch replaced and when it was all put back together, was told that he accidentally broke the temperature sensor and that I should replace it, because the check engine light will stay on without it. When I attempted to drive it, I first noticed that the heat wasn't working and then shortly after that, the engine overheated, so I parked it.

Is the sensor to blame for any of this?

Please help!
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post #7 of 10 (permalink) Old Jan 12th, 2015, 01:56 PM
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United States Male View cristo's British Racing Green & Body Color 1st Gen MINI Cooper Profile
 
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The air temp sensor near the front bumper has nothing to do with engine management.
There is, however, a coolant temp sensor below the thermostat housing on Gen 1
and in the thermostat housing on Gen 2 cars, and if they are not working or hooked up,
you will get a CEL, poor mileage and performance.

The problems with the heat may be due to pockets of air in the cooling system (including
the heater core) that haven't been bled out or worked their own way out and/or low coolant
levels or even something else like a bad thermostat.

Have you checked your coolant level, and what is the coolant temp gauge doing?

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post #8 of 10 (permalink) Old Jan 12th, 2015, 02:09 PM
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I'm thinking this gizmo is the air temp sensor. It has a pointed end and plugs into a receiving "socket housing". The guy that replaced to clutch gave me a bottle of coolant and told me about such pockets. When the temp gauge first heated up and the red light came on, I checked the level and the small reservoir was empty, so I added enough to fill it. I re-started the car and ran it for about a minute and it heated up again. I checked the level and it was about where it was. I did not, however, re-check it when I parked it back at his garage.

I don't remember exactly what the engine light read, but it was on and he told me that without that sensor, it would stay on. I haven't spoken with him yet since I returned it. He wasn't there when I did.

Do you think that replacing the sensor will take care of any of the issues I've mentioned? The weather here is really icy and I'd rather not go 75 miles just so I can see that the outside temperature is not actually -40!
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post #9 of 10 (permalink) Old Jan 12th, 2015, 08:06 PM
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United States Male View cristo's British Racing Green & Body Color 1st Gen MINI Cooper Profile
 
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You could always just order the part online. I doubt it will affect
anything besides seeing what the temp is and the chime at 37F to
alert you to temps nearing the freezing point.
I believe it's 65816936953. Around here it's about $20 for an
aftermarket one and $40 for a genuine MINI one.
You might want to put in your model and year on realoem to make sure,
but I think all the gen 1 MINIs use the same part: here's a diagram and link to start you off.

RealOEM.com * BMW R50 Cooper Temperature sensor

Keep an eye on the coolant level, there may be a few more
burps in it before it's air-free.

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post #10 of 10 (permalink) Old Jan 15th, 2015, 09:34 PM
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Thanks for the info! I'll likely wait and see if I find it crucial that I know the outside temp, but I'll keep your info for future reference.

While we're at it, the "Check Engine Soon" light is lit, presumably as a result of the engine removal to replace the clutch. Any ideas on how to reset the light without the help (and cost) of a mechanic?
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