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Old 01-20-2013, 04:27 PM
cn90 cn90 is offline
Officially Welcomed to the 'Fest
Location: Omaha NE
Join Date: Mar 2006
Posts: 14,362
Mein Auto: 1998 528i 5-sp 140K+
Search forum for "Cooling Overhaul".
You are sitting on a time bomb.

Testing Fan Clutch: if you want to keep your fingers, keep them away from the Fan Blade.
With engine hot and running, hold a piece of paper behind the Fan Blade, it should "flap", indicating that there is adequate air flow.

There are countless people with blown head gaskets b/c of failure to do a cooling overhaul.
In fact, I would not be surprised the #1 cause of death in an E39 is blown head gasket.

Last edited by cn90; 01-21-2013 at 10:43 AM.
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