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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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Old 08-18-2014, 11:11 PM
Deryck530d Deryck530d is offline
Registered User
Location: south africa
Join Date: Aug 2014
Posts: 1
Mein Auto: e39 530D
Cool hello from a newbie

i ad read somewhere that if -40 is diplayed on the bc read out, does this reading affect the non oppoeration of the a/c blowers ?
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Old 08-18-2014, 11:58 PM
Nfs021 Nfs021 is offline
What Speed Limit?
Location: Oregon, USA
Join Date: Nov 2012
Posts: 286
Mein Auto: 2002 540i
If you mean non operation of the a/c as in it's off then no of course not. The -40 is from a faulty outside temp sensor. It may affect it while the a/c is on but who knows. My control system had no problems when it was bad last year. Others have had problems were the air is not cold enough because of the faulty unit but it was usually too sporadic from what I heard. Just replace the temp sensor. It's under the right side of the front bumper just in front of the right wheel as shown in the pics . I'd suggest you get OEM though because most aftermarket ones read about 5-10 degrees hotter or colder than usual. You'll spend about $50 maybe a bit more but it's one of those things were it's better to stick with OEM.

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