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Old 03-05-2011, 01:23 PM
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rexgo rexgo is offline
BMW Student
Location: Chicago
Join Date: Dec 2010
Posts: 228
Mein Auto: 97 528i
Bluebee - thanks for all the info (I'll thank CN90 later)

I'm preparing for cooling system overhaul, and have spent hours reading all the related posts I could find, and still have a question:

Should I use any sealant on the thermostat housing & housing bolts? One thread used black silicone if the head was in rough shape.

On other cars I've always used Permatex (II I think is the non-hardening kind), but I don't recall seeing this covered.

Thks in advance

'97 528i, 99k DD
'91 CRX Si, 114k
'83 Supra, 109k
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