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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 07-15-2014, 12:48 AM
Themadwelshman Themadwelshman is offline
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Location: Anglesey. North Wales
 
Join Date: Nov 2013
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Mein Auto: BMW E36 328i convertible
Heater only works above 22

Well I've had a scan around the forum and can't seem to find anything specific to my problem.

The short version is no heat come out of my heaters unless I turn the heat up to minimum 22.

Is there an internal sensor or something inside?

1997 523i Touring.

Cheers in advance. Tony

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  #2  
Old 07-15-2014, 05:55 AM
jygesq jygesq is offline
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what is you outside temp sensor showing as a reading

if that sensor has failed it affects both heat and A/C
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  #3  
Old 07-15-2014, 06:54 AM
Themadwelshman Themadwelshman is offline
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Location: Anglesey. North Wales
 
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Mein Auto: BMW E36 328i convertible
Thanks for that mate. Don't know about the A/C as the gas is empty. Getting done next week. But even like that the heaters have worked fine for the last few months that I have owned it.

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  #4  
Old 07-15-2014, 11:29 AM
edjack edjack is offline
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Mein Auto: '97 540i 6 speed
I assume you have the automatic HVAC. If so, there is a sampling fan inside the control panel that allows measuring the cabin temperature. Ensure that it's working: It switches on as soon as you enter the car. Listen at the panel for the fan. If it's not working, the control can't correctly measure cabin temp.

The panel can be removed, and the fan cleaned and lubed. Search the E39 links, at the top of the page, for instructions.

There are two heater cores, each with its own temp sensor.

IHKA diagnostic is via BMW scan tool.
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Last edited by edjack; 07-15-2014 at 11:32 AM.
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  #5  
Old 07-15-2014, 12:01 PM
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helmet75 helmet75 is online now
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Ed, does it also use the ambient temp sensor as well?
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Old 07-15-2014, 01:00 PM
edjack edjack is offline
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Yes. The outside mirror heaters respond to freezing temps. A -40 will eventually cook them.

My A/C worked very poorly when my ambient temp sensor was damaged. It was probably just working in a dehumidifying mode.
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  #7  
Old 07-15-2014, 02:25 PM
Themadwelshman Themadwelshman is offline
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Location: Anglesey. North Wales
 
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Many thanks for your replies so far. I will have an investigation tomorrow and update as necessary. Sorry took so long to reply myself. Long day at work and fell a bloody sleep on sofa. Haha. Cheers Tony

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  #8  
Old 07-15-2014, 02:26 PM
Themadwelshman Themadwelshman is offline
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Location: Anglesey. North Wales
 
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Just had a thought. Did a new aerial install not so long ago and had the stereo out. Could I have done something then. Think it was around the same time. Not sure? Cheers

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  #9  
Old 07-16-2014, 05:25 AM
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sixpot_simon sixpot_simon is offline
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Yeah, maybe you dislodged a wire while you were in there.

Sounds like something to do with the FSU to me.
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