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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 02-07-2013, 02:51 PM
ctwfo ctwfo is offline
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Location: Alabama
Join Date: Feb 2013
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Mein Auto: 540i Wagon
Just checking coolant levels

So I went to check my coolant levels on my 2000 E39 with the engine cold and the red thing is sticking up way past the lip, all the way. So I look in there and dont see any coolant??? It does not run hot, but it will venture over the half way mark on the gauge but never runs hot or in the red.
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Old 02-07-2013, 05:11 PM
edjack edjack is online now
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Location: San Jose, CA
Join Date: May 2007
Posts: 13,459
Mein Auto: '97 540i 6 speed
The top of the red float must be level with the top of the tank. You have added too much coolant to the system. The tank needs an air cushion for proper operation. The coolant level is not visible inside the tank. Drain some out via the drain ok on the underside of the radiator. (I can't believe they censored this word!)

Unlock the cluster and monitor the actual coolant temperature, test #7. The coolant should not rise above 108 deg C.

Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.

Last edited by edjack; 02-07-2013 at 05:14 PM.
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Old 02-07-2013, 08:46 PM
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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
I typed /coolant level F3 into the bestlinks and this popped up:
- Expansion tank floating mechanical coolant level sensor height (1)

Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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