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E85 / E86 Z4 (2003-2008)
E85 Z4 convertible and E86 Z4 coupe talk with our BMW gurus here.

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  #1  
Old 12-01-2012, 02:50 PM
pete82 pete82 is offline
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Location: Georgia
 
Join Date: Dec 2012
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Mein Auto: Z4, 325Ci
Talking How to change 2003 Z4 thermostat - Help!

2003 Z4 E84, temp guage shoots to far right over-hot for a second then retrurns to normal. Engine check light is on as well. Heater only blows hot air intermittently but usually just cold even though temp setting in the cab is all the way hot. I figured it was time to replace the thermostat but have not yet done this on my Z4. Need your help, pics, videos, etc.
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  #2  
Old 12-01-2012, 03:13 PM
ZEEBOY ZEEBOY is offline
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Location: SW Ohio
 
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Mein Auto: 2001 Z3 Coupe and 2003 Z4
Couple of immediate thoughts
1. check your coolant level now
2. sounds like air in the system
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  #3  
Old 12-02-2012, 08:25 AM
pete82 pete82 is offline
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Location: Georgia
 
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Mein Auto: Z4, 325Ci
Hi Zeeboy, thanks for posting.
Coolant level good. Not familiar with issues of air in lines? Please explain.
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  #4  
Old 12-02-2012, 08:36 AM
Bob2.8 Bob2.8 is offline
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Mein Auto: 1997 2.8
A quick search will give you a lot of info, here are a couple links about bleeding air to get you started.

http://www.bimmerfest.com/forums/sho...air+in+coolant

http://www.bimmerfest.com/forums/sho...air+in+coolant
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  #5  
Old 01-10-2013, 06:56 PM
pete82 pete82 is offline
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Location: Georgia
 
Join Date: Dec 2012
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Mein Auto: Z4, 325Ci
Quote:
Originally Posted by ZEEBOY View Post
Couple of immediate thoughts
1. check your coolant level now
2. sounds like air in the system
ZEEBOY, sorry for the delay in follow up. Many thanks!! You were spot on with the air in the coolant system tip. New to BMW maintenance and was not aware of this problem even existing. But it was exactly that, simple to remedy. Thanks for being out there helping us newbies!!
Pete82
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Old 01-10-2013, 07:25 PM
Droptop85 Droptop85 is offline
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Location: Fresno
 
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Mein Auto: 03 Z4 3.0i
These cars have a fail safe thermastate. Once the thermastate reaches a certain amount of high psi it is forced open. This explains the engine overheating and then cooling down a bit. I would replace the thermastate, water pump, and exansion tank at the same time as these typically all fail at the same time.
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