That trick and others work on some computers but not all of them.
If this were my car I would check out the cooling fan and put some Water Wetter or a similar product in the coolant but if it does not get any hotter than that you should be OK.
I have tried everything I can find and still no degree mark. A lot of people on other forums can't get this trick to work either.
If I cared enough I could post a question on Computer Gurus ;)
Looking for a Used LeSabre in your area?
CarGurus has 1,238 nationwide LeSabre listings starting at $686.
Search Buick LeSabre Questions
Buick LeSabre Experts