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6 Series DIY
6 Series Do It Yourself (DIY) forum.

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  #1  
Old 01-17-2012, 10:32 AM
adamfoster2011 adamfoster2011 is offline
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Mein Auto: bmw 645ci 2004
bmw 645ci only blowing cold air from drivers side

my bmw 645ci 2004 is only blowing cold air from the drivers side when on full heat, the passenger side blows hot air (but not very hot) would this just be a problem with the temperature control switch or could it be something else. please help
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  #2  
Old 01-17-2012, 11:13 PM
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Yorgi Yorgi is offline
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Check out this thread.

Here is the page from the manual explaining how the system works.

I though my cars heat was broken too until I read the manual, and even then it was still not clear how the system works.

Let us know if this works for you.
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  #3  
Old 01-18-2012, 09:23 AM
adamfoster2011 adamfoster2011 is offline
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hi and thanks for the reply, i have tried this and the mans torso is red but still no heat, there is no heat on my body, feet or windscreen, do you think it could be a faulty temperature switch? thanks
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  #4  
Old 01-20-2012, 07:26 AM
adamfoster2011 adamfoster2011 is offline
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do you have any other ideas?
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  #5  
Old 01-20-2012, 05:41 PM
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Yorgi Yorgi is offline
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It's really hard to say. It could be something to do with a sensor or the temp control unit but I would guess it is more likely a problem with the hot water valve, heater radiator or aux water pump - number 8 and number 6 in this diagram.
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'02 Highlander - kid hauler
'01 330Ci - winter beater

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  #6  
Old 01-23-2012, 11:51 AM
adamfoster2011 adamfoster2011 is offline
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but if it was one of these wouldnt it affect both sides?
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  #7  
Old 01-23-2012, 05:47 PM
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Yorgi Yorgi is offline
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Quote:
Originally Posted by adamfoster2011 View Post
but if it was one of these wouldnt it affect both sides?
Both sides are affected right? Cold on driver and only slightly warm on passenger which is not normal. My guess is the aux pump is not working and only a small amount of hot engine water is making it to the heat exchanger. It could be the controls or something going on in the distribution housing too.
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Straight lines are for fast cars...turns are for fast drivers
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'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater

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  #8  
Old 01-30-2012, 10:19 AM
adamfoster2011 adamfoster2011 is offline
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Hi i have just noticed that the air con only works on drivers side and not on passengers side, so to sum up i have heat on passenger side and only cold and air con on drivers??? Thanks
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  #9  
Old 02-11-2012, 07:41 AM
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roseng roseng is offline
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Quote:
Originally Posted by adamfoster2011 View Post
Hi i have just noticed that the air con only works on drivers side and not on passengers side, so to sum up i have heat on passenger side and only cold and air con on drivers??? Thanks
It's simple, just change seats to adjust your temperature.
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  #10  
Old 02-11-2012, 09:48 AM
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Yorgi Yorgi is offline
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Quote:
Originally Posted by adamfoster2011 View Post
Hi i have just noticed that the air con only works on drivers side and not on passengers side, so to sum up i have heat on passenger side and only cold and air con on drivers??? Thanks
See post #2 in this thread and follow the links. Did you try those adjustments in iDrive already?
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Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater

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  #11  
Old 02-19-2014, 01:03 PM
mike9812121298 mike9812121298 is offline
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im having the same problem with my 04 645ci. the driver side has little heat after the car is warmed up for 30 min. the pass side no matter what blows cold air. ive played with all the settings in the idrive. im going to replace the thermostat tomorrow and see if that helps at all. right now it takes about 20 min of idling to show anything on the temp gauge.
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  #12  
Old 02-19-2014, 07:50 PM
tampamark tampamark is online now
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That temperature gauge is for your oil. This is the reason it takes a while to show a temperature change

Sent from BimmerApp mobile app
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  #13  
Old 03-05-2014, 03:11 PM
HULKED HULKED is offline
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Hi i had same problem & i changed the heater contol valves on the left side in the engin compartment ,working 100% now.
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  #14  
Old 03-27-2014, 05:25 PM
mike9812121298 mike9812121298 is offline
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How can you tell if the problem is the heater control valve or the heater core?
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  #15  
Old 04-24-2014, 09:30 AM
bhamade bhamade is offline
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Mein Auto: 2006 650i
Happened to me with my 2006 650i. warm air from driver side and cold air from passenger side. the technician adjusted the fereon gas and it work very well afterwards.
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