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7 Series - E38 (1995 - 2001)

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  #1  
Old 11-12-2012, 07:35 AM
mrderp83 mrderp83 is offline
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Location: Missouri
 
Join Date: Nov 2012
Posts: 4
Mein Auto: 1998 740il
Exclamation Heater

I am having an issue with my heater on a 1998 740il. The blower motor is working fine, however the heat will not come out until I start to drive the car (only blows cold until i drive). I do not know what causes this. Anyone have any solutions? Thanks.
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  #2  
Old 11-12-2012, 09:23 AM
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rrtec rrtec is offline
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Location: TN 37174
 
Join Date: Sep 2008
Posts: 819
Mein Auto: 540i/6 4/99
Check your coolant level, be sure that the system is properly bled out as trapped air in the heater coil can cause this. Have you recently serviced the cooling system?
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  #3  
Old 11-12-2012, 11:10 AM
mrderp83 mrderp83 is offline
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Location: Missouri
 
Join Date: Nov 2012
Posts: 4
Mein Auto: 1998 740il
The radiator was flushed out about a month ago. Not sure if this problem existed before the radiator being flushed. I will check the coolant level, however I am not sure on how to bleed the coolant system. Any insight would be much appreciated! Thanks for your help.
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  #4  
Old 11-12-2012, 05:26 PM
setconstr setconstr is offline
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Location: los angeles
 
Join Date: Feb 2008
Posts: 416
Mein Auto: 2001 740i sport 2006 m6
bleeding

http://www.bimmerboard.com/forums/posts/704107
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  #5  
Old 11-15-2012, 12:56 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,272
Mein Auto: E23;E30;E38;E32;E34 +
From memory there is a valve or switch that prevents the heater (heat) working until the engine is up to temp. This item may be giving problems.
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  #6  
Old 11-15-2012, 10:58 AM
mrderp83 mrderp83 is offline
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Location: Missouri
 
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Mein Auto: 1998 740il
Well the thermostat shows that the car is warm. I will be trying to bleed the system this weekend. Do you guys know where this bleeder screw is for the cooling system? Thanks!
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