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7 Series - E38 (1995 - 2001)

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Old 06-12-2010, 11:33 PM
davidbimmerman davidbimmerman is offline
red hot 330i
Location: Atlanta, Georgia
Join Date: Jun 2009
Posts: 104
Mein Auto: 2006 BMW 330I
00 740iL - Overheating problem

I have a 2000 740IL, the engine has been overheating lately, i stopped and topped off the coolent but forgot to put the cap on it, stopped and filled it again and this time i put the cap back on, someone told me that it might have air in it (the system that cools the engine got air in it, and doesnt cool it) someone have any idea whats going on?
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Old 06-13-2010, 12:52 PM
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Payback Payback is offline
Officially Welcomed to the 'Fest
Location: Sykesville, MD
Join Date: Jan 2009
Posts: 150
Mein Auto: 97' 740iL
Hello, I hope this will help you out. Video of how to add coolant. Not saying that you did it wrong but the ball indicator is made known in this video and I found it to be helpful.

Also, This is a link on how to burp your system when air is thought or found in the coolant system.

97' 740iL
"Phantom Of The Opera"
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Old 07-25-2010, 01:00 PM
Registered User
Location: BROOKLYN
Join Date: Jul 2010
Posts: 43
Check the thermonstat

Last edited by JUNEBLOOD; 07-30-2010 at 12:39 PM.
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Old 07-25-2010, 04:57 PM
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FABOCH FABOCH is offline
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Location: Thousand Oaks,Ca
Join Date: Sep 2007
Posts: 776
Mein Auto: 2000 BMW 740I SPORT
U definetly have air in the system...Turn engine on and open up OBC in your cluster. Open #9...#9 will show your temperature...turn heater on to 90 degrees ..Open hood and unscrew the vent screw loacted by the expansion tank... Car will idle to about 100 to 105 c
..You will see coolant bubbles escape the vent screw... Now with your hand reach the lower radiator hose escaping the passenger lower side of the radiator.......feel the temp by hand..if it is COLd.. the Thermostat has NOT open up........Kepp bleeding until that hose starts to feel warm or HOT...once hot then the thermostat has opened up and coolant is NOW flowing thru ur sstem corrctly....and Now tighten up the vent screw and ur DONE!@!!!!!
ask me how I knwo...I have bled my 7 about 11 times for various reasons........Im a DIY pro!
2000 740i Sport , Alpina 21`, Alpina Lip, Alpina Deco kit,Dinan 7,Dinan TB, DINAN CAI, DINAN Exhaust, Dinan Stage 5, Dinan 4/5 transmission, Dinan manifold, Highline individual interior,Eibach/Bilstein,Zimmerman Timing guides 08/13

Last edited by FABOCH; 07-25-2010 at 04:58 PM.
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Old 07-30-2010, 12:32 PM
Registered User
Location: BROOKLYN
Join Date: Jul 2010
Posts: 43
@faboch i like ya bmw cover who painted it
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Old 03-09-2015, 12:52 PM
sethf33332 sethf33332 is offline
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Location: commerce city
Join Date: Mar 2015
Posts: 1
Mein Auto: 2001 740il
Unhappy heater going in and out plus over heating,

Hey. So my 2001 740il bmw is being a bit of a drama queen. I replaced the coolant overflow tank two days ago. was driving home yesterday and saw it going towards red. I turned on the heater, put in nut and it dropped. Parked it. was a little low on coolant so I topped it off. Drove it home started to over heat and kicked on heat and it dropped. My heater started going in and out working wise. I checked oil and it looked fine. was thinking of bleeding it?? suggestions?
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Old 03-09-2015, 01:50 PM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
Join Date: Aug 2012
Posts: 3,980
Mein Auto: E23;E32;E34;E38;R50;R55
Why would you check the oil on a car showing cooling system problems? Throw away the thermostat and fit a OEM new one.
Good - Fast - Cheap: Pick any two.
E23 735i; E32 735iL; E34 535i; 2 X E38 735iL (Oxford Green and Alpine White); R50 Cooper; R55 Cooper Clubman. E38 Parts Car
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
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Old 03-12-2015, 06:58 PM
nando082 nando082 is offline
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Join Date: Feb 2015
Posts: 2
Mein Auto:
There are two fans, first is clutched and the second is a back up fan, this fan also turns on with your heater when your auxiliary water pump turns on. It looks like your clutched fan is not engaging properly.


This site has helped me out a lot. Maybe it will help you out as well.
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