Mechanics

THERMOSTAT REPLACEMENT

2003 Buick Lesabre • 6 cylinder •

What is the correct mounting position of the thermostat jiggle valve for a 2003 Buick Lesabre with a 3.8L engine. Is it 12, 3, 6 or 9 o'clock?
Thank you.
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Fertor
March 25, 2011.



Who told you it had to be in a certain position?

Tiny
Fixitmr
Mar 25, 2011.
You could speculate that the plane of the thermostat will have a bearing on the valve position. A horizontal installation would benefit from a 12 position since air rises to top.

Tiny
Fixitmr
Mar 25, 2011.