Hi All,

a friend of mine have a 850 sedan. The sender, what turn on the 
crazy "overheating" light on dash is wrong. This sender mounted 
unter one of head bolts.
My question is follow: can i remve just that one bolt, change the 
sender, and retighten it with proper torque (off curse on _cold_ 
engine), or do i need remove _all_ bolts following step-by-step 
the workshop manual, and reinstall they.

Thanks fr future,

Gabor