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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 11-15-2011, 06:21 PM
bearsbmw bearsbmw is offline
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Location: etobicoke
 
Join Date: Feb 2009
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Mein Auto: honda
No heat from dash great heat from defrost

Hi
Got great heat quickly from the defroster,but almost no heat from any of the dash,controls,any ideas?
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  #2  
Old 11-16-2011, 05:25 AM
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M.Wong M.Wong is offline
E38 E91 (R56 E30 E39)
Location: Seattle WA
 
Join Date: Jan 2003
Posts: 2,323
Mein Auto: The E38
What kind of car do you have? A BMW? A 7er? A 1995 to 2001 7er?
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E38 2000 740iL Orient Blue
E91 2012 328xiT Alpine White

Passed on to new families:
E30 1987 325i Royal Blue
E39 2003 540i/6 Sterling Gray
R56 2010 Mini Cooper S British Racing Green


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  #3  
Old 11-16-2011, 06:39 PM
bearsbmw bearsbmw is offline
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Location: etobicoke
 
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Mein Auto: honda
Hi
I have a 2001 740i ,good heat quickly from defrost,but the drivers side dash vents are cool,pass side slightly warm,with temp controls set at 90!
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  #4  
Old 11-17-2011, 12:14 AM
Muhammad's 740i Muhammad's 740i is offline
Muhammad's 740i
Location: Petaluma CA
 
Join Date: Apr 2011
Posts: 19
Mein Auto: BMW 740i
I have the same problem but there's no heat coming on defrost on too. The temp I set is on 90 degrees but still no luck. Would highly appreciate if somebody can help. It's 2001 740i. My car is equipped with heated seat so that's what I'm using so far
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  #5  
Old 11-18-2011, 08:42 PM
azyankee7 azyankee7 is offline
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Location: Oceanside,CA
 
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Mein Auto: 2000 BMW 740i
My car also gets heat from the defrost but not the vents
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  #6  
Old 11-18-2011, 10:18 PM
nsschris nsschris is offline
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Location: Central Illinois
 
Join Date: Nov 2011
Posts: 8
Mein Auto: 1999 BMW 740IL
I also have this issue. well very similar. Defrost is hot and everything but the vents only get slightly warm. but ocasionally they will heat up nice and hot.
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  #7  
Old 11-19-2011, 05:48 AM
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joyism5 joyism5 is offline
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Location: USA
 
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Posts: 1,270
Mein Auto: '99 740IL, K75RT
Did any of you guys had the fresh air filters and cabin air filters changed?
They are 4, 2fresh air filters on the hood, and 2 cabin filters (under the dashboard one on driver side and one on pass. side). It is essential to have filters change every year or 15k miles depending on the dusty driving conditions. Lift the hood, and on the firewall there are 2 door flaps for the air duct. Push the doors and check for debris or strange object in there.

Microfilters are used in BMW climate control systems, this includes all vehicles produced
after 9/91 (except E30) .In addition, all E31 vehicles have been equipped with microfilters
since start of production.

Fresh air is continuously filtered through the microfilters. Never operate an E38 without the microfilters installed,
There is the danger of water being drawn into the heater and/ or damage to the electrical
system.

The microfilter is designed to trap potentially iritating types of particles with very high efficiency.
Examples :
-Pollens
-Spores
-Dust
-Vapors
-Floating air pollution
-Bacteria
-Viruses

Under normal operating conditions the microfilter(s) should be replaced every Inspection I
and II (also every Oil Service 99 MY), except for M roadster or M coupe.The actual
service life of the microfilter depends on the amount of contaminant and air flow rate
reduction complaint, therefore the replacement interval may be more frequent in dusty
operating conditions.
E38 models have additional filters for the recirculation air inlets which require replacement
at every second inspection II.

Now, while you are changing the filters , check the air duct for leaves or an kind of dirt. If that doesn't solve the issue you might have a door flap actuator problem or the AC control panel. More info about the air distribution in these cars :
http://www.meeknet.co.uk/E38/
http://www.bimmerboard.com/forums/posts/679901
www.e38.org
Microfilter replacement :
http://www.bimmerboard.com/forums/posts/348259
http://www.e38.org/gsussman/740i_rec...eplacement.htm
For those that the defrost is not working at all , the defrost button should be removed and check the OHM resistance with a voltmeter, like described here http://www.laczik.org/BMW/repair/E38_AC/E38_AC.html. If there is no resistance at all , this might pin point an door flap actuator failed.
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Last edited by joyism5; 11-19-2011 at 05:56 AM.
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  #8  
Old 11-19-2011, 05:51 AM
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joyism5 joyism5 is offline
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Mein Auto: '99 740IL, K75RT
@ azyankee7 & nsschris : yours is similar with this http://www.laczik.org/BMW/repair/E38_AC/E38_AC.html
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  #9  
Old 11-19-2011, 05:54 AM
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joyism5 joyism5 is offline
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Mein Auto: '99 740IL, K75RT
@ bearsbmw : I would suspect a door flap actuator went bad or air duct is obstructed. Check air filters first.
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  #10  
Old 11-19-2011, 05:58 AM
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joyism5 joyism5 is offline
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Mein Auto: '99 740IL, K75RT
Muhammad's 740i : defrost switch is working properly? Do you hear the blower going faster when you push the button?
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  #11  
Old 11-20-2011, 12:10 AM
Muhammad's 740i Muhammad's 740i is offline
Muhammad's 740i
Location: Petaluma CA
 
Join Date: Apr 2011
Posts: 19
Mein Auto: BMW 740i
Yea everything works, when I press the defrost button it goes all the way up but the normal air comes out not warm. It's same for the heater too.
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  #12  
Old 01-28-2013, 10:37 AM
apocolyps3 apocolyps3 is offline
E38 2001 740 il
Location: Tempe, AZ
 
Join Date: Jul 2012
Posts: 22
Mein Auto: E38 2001 740 il
So....did anyone get the chance to fix this issue? I have the same problem too.
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E38 2001 740il
E34 1995 540i
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  #13  
Old 01-28-2013, 05:00 PM
GVC GVC is offline
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Location: Austin, TX
 
Join Date: Sep 2012
Posts: 10
Mein Auto: 1997 BMW 740iL
I'm having the same problem. Clean fresh air filters.
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  #14  
Old 01-28-2013, 09:48 PM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,458
Mein Auto: E23;E30;E38;E32;E34 +
Filters and doors plus debris on the heat exchanger - my guess.
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