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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, 11:32 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, 03:25 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, 03:27 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.
2006 750li K&N Filters Giovanna Kilis on 265/30/22 305/25/22 HID fogs 6000k Mtec angel eyes all lights 6000k ACS front lip,ACS rear wing,ACS rear window wing.dual exhaust working qual tips, rear camera, upgrade DVD to front watch jl13.5t sub with jl500/1v2 amp power cap.PassPort 9500ci,CrossDrilled&Slotted Rotors with EBC Brake Pads.Rear comfort seats, Fully loaded from dealer. Next mod iPhone hookup, .
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Old 01-24-2013, 03:28 PM
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Db750 Db750 is offline
Location: Lexington, Kentucky
Join Date: Jun 2010
Posts: 3,500
Mein Auto: 2015 M235i & 2013 M3 CP
Thermostat should give a check engine light and code.

Here is a DIY:


2015 M235i - AW/Black - Premium, Tech, Drivers 1, HK, CW, Enhanced BT, Alarm, 20%, 18" VMR V710 Staggered w/Conti SC5, OEM black grills, CF Mirrors & Spoiler, M Exhaust/tips, M diffuser, IND Reflectors

2013 E92 M3 - LMB/Black - CP, Tech, Indiv Audio, CW, 20%, CF Roof, DCT, OEM CF Mirrors, Spoiler, Interior Trim, LUX V4, OEM Performance Grills, Full IND pkg,Muffler Delete

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Old 01-24-2013, 03:50 PM
inspi inspi is offline
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Location: Ostrava, Czech Republic
Join Date: Mar 2012
Posts: 261
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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