Starting at the beginning...
The engine burns a combination of fuel and air - in fact, gasoline will not even burn all by itself, it requires the presence of some air.
The engine computer controls the mixture / ratio of how much air and how much gas is perfect at any given time.
All those sensors that you find all over today's car are feeding information to the computer - things like the temperature of the air, the barometric pressure, the temperature of the engine coolant, how much oxygen is in the exhaust, and so on.
Based on all this information, the computer will adjust the mixture to more fuel, or less fuel, more air or less air.
Sometimes the computer gets it wrong based on something is starting to go wrong with some part of the system.
Another situation that is very common that results in the mix being wrong is when air is sneaking into the system, bypassing the sensors in a way the computer doesn't know the extra air is even there.
When you hear the term "vacuum leak", that's a reference to air sneaking in through a broken rubber hose, a seal that has hardened and shrunk, or a dozen other situations.
When there is too much fuel in the mix = "rich condition".
Not enough fuel, or conversely, too much air = "lean condition".
Could be sucking air into intake.
The Mercury Sable and the Ford Taurus will have DOC in printed on the engine if they are dual overhead cam engines. The symbol should be on the top of the engine.
No 2011 Mercury Sable model , but there is a 2011 Ford Taurus
You run the engine till warm then look underneath and see if the pump is leaking. A faulty pump leak is very visible in Taurus/Sable.
99% sure the Taurus radiator will be a perfect match to the Sable's.
No, a Generation 2 (1992-1995) Taurus/Sable Windshield will NOT fit a Generation 3 (1996-1999) Ford Taurus/Sable.
No they do not
My 2002 manual says: 11.6 quarts for the Vulcan engine and 10.6 for the Duratec.
This car does not have daytime running lights.
If your alternator is good it should stay running until your engine dies from no fuel.
13.8 - 14.4 volts DC,13.82 with engine running and headlights on!
On a 2002 Mercury Sable the radiator is at the front of the engine compartment