There should be a tensioning pulley that you lift off of the belt to create slack in the belt to get the belt off. Make sure you have a diagram of the belts routing before you take it off so you know how the new belt goes on. Take a picture or draw quick sketch.
According to the 1999 Mercury Sable Owner Guide : With engine oil filter change : The 3.0 liter Duratec ( DOHC ) V6 engine takes : ( 5.5 U.S. quarts of 5W-30 )
According to the 1999 Mercury Mountaineer Owner Guide : For the 4.0 liter SOHC , V6 engine and the 5.0 liter V8 engine : With engine oil filter change : ( 5.0 U.S. quarts )
According to the 1999 Mercury Mystique Owner Guide : ( 5W-30 ) certified for gasoline engines ( 2.0 and 2.5 liter )
The 2.5 liter " Duratec " V6 engine used in a 1999 Mercury Cougar uses ( 2 ) timing CHAINS , both located at the front of the engine ( 1 chain to each cylinder head )
How do you change the thermostat in 1999 Mercury Villager
The 1999 Mercury Mountaineer either has the ( 4.0 liter Single Over Head Cam , V6 engine or the 5.0 liter V8 , which is an over head valve / pushrod design engine ) Helpfull
the firing order is 142536
Either the 3.0 liter Vulcan V6 or the 3.0 liter Duratec V6 which is a DOHC
In a 1999 Mercury Mountaineer : Either the 4.0 liter Single Over Head Cam ( SOHC ) V6 engine , or the 5.0 liter V8 , which is an over head valve / push rod design engine
According to the 1999 Mercury Sable Owner Guide : For the 3.0 litre , DOHC , " Duratec " V6 engine : With engine oil filter change : ( 5.5 U.S. quarts of 5W-30 engine oil )
The Owner Guide for the 1999 Mercury Cougar shows ( 5.8 quarts with filter change ) for the 2.5 liter V6 engine
There is no change transmission lamp.