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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 08-09-2015, 02:25 PM
buzzy30 buzzy30 is offline
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Location: GA
Join Date: Aug 2013
Posts: 5
Mein Auto: 530 series
Temp Gauge

1 of 2

On my 2002 530I
I have changed both the temp sensor & the therm sensor, my temp gauge still goes into the red for maybe 5 seconds and returns to the normal position as I'm driving on the highway the car has not overheated as of yet.
I have also changed the radiator, hoses, and water pump. Are there any suggestion to the root cause and possible fix.

2 of 2

I have the following codes (evac & cat) are preventing the vehicle from passing emissions,
this occurred after changing out the battery. I have driven the vehicle over 500 miles and still not ready.

Thanks B

Last edited by buzzy30; 08-09-2015 at 02:34 PM.
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Old 08-09-2015, 02:48 PM
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johnstern johnstern is offline
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Location: Cape Neddick, Maine
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Posts: 1,599
Mein Auto: 2000 BMW 528iT/5, S/C
I don't know what you mean by temp sensor and therm sensor. The sensor that sends the temperature signal to the dash gauge and the DME is the double temperature switch that is located in the cylinder head at the back of the engine. If you've replaced that, I'd guess you have to bleed the cooling system again.

You car has to go through the proper steps for a 'BMW E39 drive cycle'. You need to search for a description of the drive cycle on this forum or Google and you'll get a precise description of said cycle.

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Old 08-09-2015, 03:01 PM
buzzy30 buzzy30 is offline
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Location: GA
Join Date: Aug 2013
Posts: 5
Mein Auto: 530 series
Thank You John, I will try to get information on the drive cycle
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Old 08-09-2015, 05:02 PM
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Flounderasu Flounderasu is offline
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Location: Arizona
Join Date: Jun 2013
Posts: 193
Mein Auto: 02 540i 6MT
Sounds like air in the system setting aside the possibility that your DTS has failed or is failing.
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