2009 E81 Heater Issue Hot OR Cold

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Manufactured from 2004 to 2013

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andreasaravis
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2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Thu Nov 09, 2017 1:59 pm

My 2009 116d has a funny thing happening with the heater.

If its on max (28) then it blows hot heat. If i turn it down 0.5 (27.5) then it blows out cold. There is no happy medium, either Hot OR Cold.

Any ideas?

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Nottsknots
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Re: 2009 E81 Heater Issue Hot OR Cold

Post by Nottsknots » Thu Nov 09, 2017 3:20 pm

Odd!

Does it chuck out really ice cold air, and does it do it for a really long time, so the cabin actually gets cold, even on 27.5?

I had noticed on mine that turning it down by a small amount lead to it chucking out cold air to adjust the temp at the sensor as quickly as possible, but thats usually when theres a few degrees difference between actual temp and set temp. It also stops when it gets to the new set temp - I'm assuming yours just goes down to outside temp, or cooler with aircon running, even with 27.5 selected?
E87 118d, stock, plus PDC control unit drain, Parrot, debadged, Mothercare baby shades (but no babies), and occassionally a good layer of wax. Instantly forgettable, and thats the way I like it.

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Thu Nov 09, 2017 3:34 pm

Its not ice cold air its luke warm.

I very rarely have the aircon on in the winter, but yes at 27.5 no heat comes out at all, only comes out at 28.

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stevesurrey
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Re: 2009 E81 Heater Issue Hot OR Cold

Post by stevesurrey » Thu Nov 09, 2017 9:18 pm

I wonder if it could be a faulty cabin sensor. I seem to recall being told the 'max' setting effectively over-rides the system and blasts out heat whatever the sensors say is needed.
E81 120D (N47) SE+Dynamic Package, 2007/57, M Sports Suspension, Montego Blue, Pro HU+HiFi Speakers & Dipstick

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Mon Nov 13, 2017 10:17 am

Thanks Steve, i will clean the sensor, if all else fails i'll order a new sensor and see how we go.

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Mon Nov 13, 2017 11:52 am

I've just taken out the climate control unit and there was an awful lot of dust on the sensor! I've since give it a good clean so i will test it late to if it works.

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by stevesurrey » Mon Nov 13, 2017 2:44 pm

Is your cars outside temperature display giving correct readings ?
E81 120D (N47) SE+Dynamic Package, 2007/57, M Sports Suspension, Montego Blue, Pro HU+HiFi Speakers & Dipstick

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Tue Aug 14, 2018 3:32 pm

Yes the outside sensor is giving me the correct reading

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by Beninjam » Fri Aug 17, 2018 6:38 pm

Did you ever manage to get to the bottom of this problem? My 116i just started doing exactly the same thing. Weirdly all happened after picking it up from getting the recall problems fixed :oops: The garage blame it all on coincidence :censored:

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Sat Aug 18, 2018 8:50 pm

No I haven’t resolved it yet. But as the cold weather will be kicking in soon I would like to get this fixed!

Can anyone help us?


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Nottsknots
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Re: 2009 E81 Heater Issue Hot OR Cold

Post by Nottsknots » Sun Aug 19, 2018 5:39 am

Anyone nearby you can swap the control panel with temporarily? (At least to eliminate it as a source of failure).

A wild one, is your battery all good? Beemer electrics are voltage sensitive. I havent heard of this kind of fault, but anythings possible. What voltage do you get with a cold engine with engine off, and with the engine running?

I’d think most likely is one of the temp sensors.
E87 118d, stock, plus PDC control unit drain, Parrot, debadged, Mothercare baby shades (but no babies), and occassionally a good layer of wax. Instantly forgettable, and thats the way I like it.

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Sun Aug 19, 2018 10:32 am

I’ll have to get the battery voltage tested, but surely this wouldn’t cause the heat issue?

As the winter is coming it would be nice to get this sorted.


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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Sun Aug 19, 2018 10:33 am

All the temp sensors are working fine


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Nottsknots
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Re: 2009 E81 Heater Issue Hot OR Cold

Post by Nottsknots » Sun Aug 19, 2018 11:21 am

Battery voltage can cause all sorts of nonsense with beemers. You can test yourself, as there is a voltmeter built into the hidden menu (just search hidden menu on here, there are instructions in one of the posts).
E87 118d, stock, plus PDC control unit drain, Parrot, debadged, Mothercare baby shades (but no babies), and occassionally a good layer of wax. Instantly forgettable, and thats the way I like it.

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Re: 2009 E81 Heater Issue Hot OR Cold

Post by andreasaravis » Sun Aug 19, 2018 1:12 pm

12v standing and 14.6/7 when running

I love this hidden menu by the way


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