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Old 12-08-2012, 02:31 PM
Takechan Takechan is offline
E39 fanboi
Location: Scandinavia
Join Date: Mar 2009
Posts: 244
Mein Auto: BMW E39 520i (M52B25)
Just last week when it hit minus -1C I noticed it took forever to reach operating temp (middle of gauge). When it finally did, it seemed to hover between dead center and a little to the left. I removed the fan, and it didn't help. Then I replaced the t-stat with an OEM and it heats up very quickly now, compared to before.

The old t-stat was an unoriginal part I installed last April, when I swapped engine. The buildup of yellow residue is also gone now

Funny thing is that I didn't notice any of this until it got pretty cold.
"If you find yourself in a hole, the first thing to do is stop digging." - Will Rogers
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