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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
01-05-2010, 09:17 AM
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heating issues inside car
developed a heating issue that when car sits and idles the air turn cold until I start driving or bringing up the rpms.At every stop light I come to and wait it gets cold but my temp guage stays right in the middle where it always has been. Just opened hood and felt my hoses and the upper hose is hot but the lower hose is cold. Radiator was new last summer, could it be the thermostat? Heats fine when driving. I have a 1998 528I.
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#2
01-05-2010, 09:52 AM
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Lower hose s/b cold. The outside temp is below freezing, right?
Might be the heater valve. Search this forum.
__________________
 Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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#3
01-05-2010, 11:00 AM
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didnt know it was supposed to be cold when below freezing. Thanks for info I;ll search forum for heater valve
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#4
01-05-2010, 11:41 AM
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Search bimmerboard for 1998 528 cooling system overhaul. Sounds like a thermostat jammed open.
__________________
'99 528i ('98/12 build). 174,000km BY29428/Royalrot Breaking My Wallet since 2009 Mods: Stoptech SS brake hose, 280piece toolkit resting on trunk floor, Beisan VANOS seals '99 540i (grandfather's)  
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#5
01-06-2010, 08:38 PM
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I was having a very similar problem a few weeks ago. My coolant was a little low but the main problem was the system needed to be purged of air. I found the "how to" by searching the forum here and all seems well. Good luck.
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