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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 02-08-2015, 12:26 AM
patrickjoseph patrickjoseph is offline
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Mein Auto: 1998 528iA, 2015 X3 28i
heater blower acting funny

Normally my heater blower will turn on once the engine warms up beyond the blue stage in the temp gauge (usually 5 minutes in this winter weather). Now the heater blower won't turn on until after 20 minutes or more of driving. Once it turns on, everything works normally. No other electrical issues besides the delayed heater blower. Anyone else have this issue? Any thoughts?
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1998 BMW 528ia (200k+ miles and still going strong)
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  #2  
Old 02-08-2015, 05:58 AM
JimLev JimLev is offline
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Mein Auto: 540/6, S60 Volvo, Tribeca
FSU sounds like its starting to die.
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  #3  
Old 02-08-2015, 06:28 AM
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QSilver7 QSilver7 is offline
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Mein Auto: 1997 740iL / 2006 X5 4.4
Wait...you told us that the hvac system used to come on when temp gauge moved passed the blue (usually within 5 minutes)...but now that its taking 20 minutes...you said nothing about the temp gauge which could indicate a thermostat issue & recommend or suggest to look at the cooling system.

The details you left out could end up giving you electrical issue suggestions...which could send you down the wrong path. Is there any relationship with the extended time it takes for the hvac system to turn on and the engine warming up...or do you think this may be an electrical issue with the blower's regulation (FSR/FSU issue)?
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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg
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  #4  
Old 02-08-2015, 07:08 AM
patrickjoseph patrickjoseph is offline
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Mein Auto: 1998 528iA, 2015 X3 28i
Quote:
Originally Posted by QSilver7 View Post
Wait...you told us that the hvac system used to come on when temp gauge moved passed the blue (usually within 5 minutes)...but now that its taking 20 minutes...you said nothing about the temp gauge which could indicate a thermostat issue & recommend or suggest to look at the cooling system.

The details you left out could end up giving you electrical issue suggestions...which could send you down the wrong path. Is there any relationship with the extended time it takes for the hvac system to turn on and the engine warming up...or do you think this may be an electrical issue with the blower's regulation (FSR/FSU issue)?
No issues with the temp gauge and the engine warming up. Heater blower just isn't turning on when it normally does which is when the temp gauge moves out of the blue zone.
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1998 BMW 528ia (200k+ miles and still going strong)
2015 BMW X3 xDrive 28i
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  #5  
Old 02-08-2015, 08:59 AM
patrickjoseph patrickjoseph is offline
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Quote:
Originally Posted by JimLev View Post
FSU sounds like its starting to die.
I looked up the FSU and says there is one for the front and one for the rear? Which one do I need? Anyone have a part number? Thanks.
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1998 BMW 528ia (200k+ miles and still going strong)
2015 BMW X3 xDrive 28i
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  #6  
Old 02-08-2015, 09:59 AM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
I typed /fsu f3 in the bestlinks, and this came up ...
- What FSU is the right one to buy (1)
See also:
- How to troubleshoot a bad FSU final stage unit (1) and how to build a test jig for your FSR final stage resistor (1) & how to autopsy or repair solder cracks in your blower motor resistor (1) & how to replace your HVAC blower resistor (1) & what FSU is the right one to buy (1) & how to remove the IHKA heater air conditioning control panel to clean the circuit board (1) & how to check the HVAC (IHKA) sampling fan (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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