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7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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Old 01-24-2013, 10:32 AM
FinishLine FinishLine is offline
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Location: Wausau WI
Join Date: Oct 2012
Posts: 26
Mein Auto: 745LI
Must Be Thermostat?

So I think my problem with my car blowing cool air when sent to 90 on high is a stuck open thermostat.

Last night, I ran the car indoors in my shop for at least 15-20min (its 70 in the shop) air got nice and hot but could not get the engine temp above 69 degrees C. From what I've read, its supposed to be around 100-105C.

Today I start it up in the shop, blowing warm air and as soon as I start driving the air starts getting cooler and engine water temp is down to mid 50sC. So I believe that the thermostat is stuck open correct?

How difficult is it to change on these and where is it located?
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Old 01-24-2013, 02:25 PM
KaileSvick KaileSvick is offline
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Location: Tampa, FL
Join Date: Sep 2012
Posts: 378
Mein Auto: 2003 BMW 745Li
Difficulty not sure. But it's located in the water pump
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Old 01-24-2013, 02:27 PM
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rideme2 rideme2 is offline
Location: new york
Join Date: Dec 2009
Posts: 548
Mein Auto: 2006li bmw
It's super EASY!!! 15 minutes its connected to the bottom hose and water pump.
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Old 01-24-2013, 02:28 PM
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Db750 Db750 is online now
Location: Lexington, Kentucky
Join Date: Jun 2010
Posts: 3,545
Mein Auto: M3 - M6 - 911
Thermostat should give a check engine light and code.

Here is a DIY:


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Old 01-24-2013, 02:50 PM
inspi inspi is offline
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Location: Ostrava, Czech Republic
Join Date: Mar 2012
Posts: 266
Mein Auto: 03 BMW 745i, 06 BMW 750Li
i see couple thermostats stuck open-easy to change and then you get better MPG
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