my A/C will only work sometimes either on MAX or OFF!! - Bimmerfest - BMW Forums

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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 08-16-2010, 11:31 PM
mr boomerang mr boomerang is offline
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Location: Rancho Belago, CA
Join Date: Feb 2010
Posts: 65
Mein Auto: 2000 e39 528i///M package
Exclamation my A/C will only work sometimes either on MAX or OFF!!

so i have a '98 528i m-sport...i'll have the temp down to 69 degrees F and have it on auto and it WILL NOT blow air...not even if i take it off auto and put the bars all the way up WILL NOT blow...UNTIL about driving the car for a half hour...then it will blow on max for about 10 seconds, then turn off...i took it to a mechanic who diagnosed the problem being the greenish white relay underneath the hood that controls the blower motor...before i go out and spend $90 on a relay, would this be the cause of the air not blowing?? thanks
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Old 08-17-2010, 02:54 AM
99SK04GTX 99SK04GTX is offline
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Location: VA
Join Date: Apr 2010
Posts: 41
Mein Auto: 2002 540i
Sounds like a typical FSU problem, Final Stage Unit, Final Stage Resistor.

Search this forum for "FSU"
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Old 08-17-2010, 02:12 PM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by 99SK04GTX View Post
Search this forum for "FSU"
If it is the FSU, you don't even have to search the "forum"; just search the bestlinks sticky at the top of this forum for "FSU".
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Old 08-17-2010, 04:43 PM
jarhed1964 jarhed1964 is offline
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Location: Charlotte, NC
Join Date: Apr 2010
Posts: 714
Mein Auto: '99 528i Sport, '05 530i
Probably the EASIEST fix you'll ever perform. Enjoy it, many more harrowing, annoying, confusing, and maddening fixes will come your way soon.

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