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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 03-02-2011, 07:17 PM
larry mc new larry mc new is offline
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Location: brookville ohio
 
Join Date: Jul 2007
Posts: 38
Mein Auto: 1997 bmw z3 2.8 5spd
Z3 Check your radiator fan

My 97 Z3 has 144K and I have done all the preventative maintenance that we all do .ecpecially when it comes to the cooling system. However one thing I didn t consider and found out the hard way last week. One of the blades on the radiator fan broke off and wedged between the radiator and fan ,stopping the fan from turning and quickly overheating. Luckily I was coming up to a stop light and noticed my temp gauge hitting 220
I immediately shut it off and had her towed home.
After removing everything in the cooling system and finding no other probable cause, I replaced the fan and everything is operating fine. I suggest replacing the fan every time you replace the water pump. I certainly am.

Cheers
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  #2  
Old 03-02-2011, 07:47 PM
SUNZOUT SUNZOUT is offline
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Location: Bataiva, IL
 
Join Date: Jan 2007
Posts: 1,575
Mein Auto: '00 M Roadster
Sorry but your late to the party, well known to have them fail. Your actually lucky they did not hit/dent the hood.

Are you sure you Waterpump is OK and the Engine mounts are OK. Those are two possible reasons to trigger the break.
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  #3  
Old 03-02-2011, 10:40 PM
RobZR RobZR is offline
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Location: Milwaukee WI
 
Join Date: Feb 2011
Posts: 3
Mein Auto: BMW e34,e36/7,e38
Also check the fan clutch.
if it bind and doesn't disengage at high rpm the fan can come apart. On my e34 one blade tookout the upper hose, another went thru the radiator, and a third wedged in between the shroud and water pump neck , breaking all the rest of the blades. all this after replacing the whole cooling system the year before. i was lucky it didn't go through the hood.

If your water pump seems ok. keep an eye on it for any play.

Good luck

RobZR

MKE
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  #4  
Old 03-03-2011, 05:43 AM
Skyhawk Skyhawk is offline
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Location: Houston
 
Join Date: May 2007
Posts: 106
Mein Auto: BMW 325i, M-roadster
Maybe consider doing a fan delete mod? At the least one less thing to worry about going through the hood. I have done the mod for almost a year now and have no problem with over heating so far..
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  #5  
Old 03-05-2011, 05:46 PM
larry mc new larry mc new is offline
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Location: brookville ohio
 
Join Date: Jul 2007
Posts: 38
Mein Auto: 1997 bmw z3 2.8 5spd
Thanks for the feedback. I went ahead and replaced the waterpump with a stewart as well as the idler pully and radiator since it had been on my to do list anyway.
definitely will keep a closer eye on things now.
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