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temperature gauge fluxtuation

Printed From: Bavarian-Board.co.uk - BMW Owners Discussion Forum
Category: Technical & Model Specific Forums
Forum Name: BMW 5 Series
Forum Discription: This forum will deal with any issues on the BMW 5 Series (E12, E28, E34, E39, E60 & E61)
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=50062
Printed Date: 29-April-2024 at 10:29


Topic: temperature gauge fluxtuation
Posted By: bookerfatz
Subject: temperature gauge fluxtuation
Date Posted: 07-November-2013 at 14:55
I recently noticed that when engine is at normal operation temp that when I turned up cabin heat the temp. needle immediately dropped for a few seconds then returned to top dead center where it normally holds steady. It also seems like it's taking longer for the engine to assume top dead center reading. I haven't noticed that I'm loosing any coolant. I've only owned the car about 7 months but it's been running great since I bought it. I was told that I should perhaps bleed the cooling system. This problem ring a bell for anyone?

2002 E39 Touring 165K

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Booker

2002 E39 5 series Touring


Replies:
Posted By: Andrew Rolland
Date Posted: 07-November-2013 at 15:56
Classic symptoms of a failed (or in the process of failing) thermostat.
 
My E39 did just as you describe, new thermostat from Euro Car parts cured that fault. About £10 way back in 2005 for a new 'stat.
 
You might need to replace the thermostat housing as when you take it off the old gasket may not re-seal properly.
 
Have a read of http://www.bavarian-board.co.uk/forum_posts.asp?TID=25689&PN=1" rel="nofollow - this thread on how I did my 'stat replacement along with the water pump replacement.
 
What engine is in your E39?


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Be exclusive and drive a Petrol 5 Series!

Current
'13 62 F10 535i MSport Auto

Previous
'04 04 E60 545i SE Auto
'03 53 E60 545i SE Auto (Stolen)
'98 S E39 523i SE Auto

Posted By: bookerfatz
Date Posted: 07-November-2013 at 22:00
Me thinks your right with your analysis. And thanks for that thread links. Made me gulp when while reading it BTW. Probably worth this investment: <http://www.ebay.com/itm/BMW-GM-Water-Pump-Hub-Fan-Clutch-Nut-Wrench-Holder-Tool-/181252218279?pt=Motors_Automotive_Tools&hash=item2a33795da7&vxp=mtr>. should be able to find it over here though. Maybe this will all look better in the morning. Thanks for your time!


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Booker

2002 E39 5 series Touring

Posted By: Andrew Rolland
Date Posted: 08-November-2013 at 08:17
Yeah it will be so much easier if you  buy the tool that holds the water pump pulley bolts so that you can undo the thermo viscous fan with a LEFT hand thread.

-------------
Be exclusive and drive a Petrol 5 Series!

Current
'13 62 F10 535i MSport Auto

Previous
'04 04 E60 545i SE Auto
'03 53 E60 545i SE Auto (Stolen)
'98 S E39 523i SE Auto


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