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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 06-26-2012, 11:46 AM
nevada458 nevada458 is offline
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Check Coolant warning after using the AC

On my 2000 540i, using the AC causes a "check coolant level" message. Coolant level is ok and AC works ok. I've searched for but can't find a solution to this. Anyone know of one? Thanks.
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  #2  
Old 06-26-2012, 01:59 PM
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540 M-Sport 540 M-Sport is offline
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Most likely one of two things:

1) Coolant level is actually a bit low...when stone cold (never check warm), make sure the top of the stick is about 1" above the top of the filler neck.

2) The level sensor is bad and needs to be replaced.

3) You may have an air pocket in the system. When warm, with engine running, slowly open the bleed screw a little bit (next to the filler neck) and see if you can bleed out any air.
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Last edited by 540 M-Sport; 06-26-2012 at 02:00 PM.
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Old 06-27-2012, 11:31 AM
nevada458 nevada458 is offline
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Thanks, the level seems to be ok and I've bled the system twice per instructions on other threads. I'll try the hot bleed next.
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Old 06-27-2012, 02:25 PM
edjack edjack is offline
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The stick is supposed to be level with the top of the neck.
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Old 06-29-2012, 08:11 AM
nevada458 nevada458 is offline
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Top of stick is 2" above top of neck and no fluid is visible in upper 4" of expansion tank. Fluid level is at the lower neck about 4" down from top of the neck.
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Old 06-29-2012, 09:10 PM
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540 M-Sport 540 M-Sport is offline
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Quote:
Originally Posted by edjack View Post
The stick is supposed to be level with the top of the neck.
I have found that keeping it a bit higher prevents the silly light from coming on in the dead of winter, upon cold start. Must contract a bit more in the colder weather? I just know that every winter the damn light would come on, so if I kept it a bit higher, eliminated that annoyance.
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  #7  
Old 06-29-2012, 09:12 PM
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Quote:
Originally Posted by nevada458 View Post
Top of stick is 2" above top of neck and no fluid is visible in upper 4" of expansion tank. Fluid level is at the lower neck about 4" down from top of the neck.
I would suspect your coolant level sensor could be bad on your expansion tank. No overheating and guage reads okay, right?
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Old 06-30-2012, 11:58 AM
nevada458 nevada458 is offline
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Yes, must be the sensor. Engine temp gauge is steady at center. I'll replace it.
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