How to change it? how to lossen the serpentin belt and change the accompressor

Most if not all compressors have an electric clutch. They do not rotate unless there is power to the clutch. I would disconnect the compressor instead.

If you have the older style V-Belts you have to lossen
a couple of the accy's--alternator,power steering pump,
air pump,etc

For a single serpentine belt- you just pull the tension of the
spring loaded belt tensioner

You may have to remove a plastic or rubber splash shield
as well as a tire & work thru the wheel well & over the sub frame

Below is the master help link provided to go through belt routing diagram:---Timing belt, drive belt, serpentine belt, accessory belt, fan belt, engine belt routing diagrams for all types of car models?
Click the link below: ----

http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html
----------This will help. Thanks.

Do you mean timing belt or serpentine drive belt (the one that runs the accesories on the front of the motor)? In either case, please re-comment on this stating which belt you mean and what make / model / year / engine size your vehicle is. Thanks, Mike

serpentine belt or standard belt system?if standard lossen 12mm bolt and tensioner on alt.slide left.drop 14 mm bracket bolt then drop slide bolt. dissconect 10mm or 12mm bolt om starter then clip inn alt drop alternater reverse in. diff on serp drop serp by tensioner pulley rest the same

the 4.0 didn't come with a spring type tensioner if look under the p/s pump there is a jack bolt hooked to a idler pully loosen nut on front of pully and lossen up the jack bolt till you can get the belt off

There should be a square big enough to fit a 3/8" drive ratchet into on the tensioner (should be closest to the pulley), insert the ratchet into that square, then try turning the tensioner, this should release the pressure on the serpentine belt. Hope this helps.

Serpentine systems have a spring loaded tensioner to keep the belt on. A well designed tensioner will have a square cutout on it to accept a ratchet. Poorly designed ones you have to use a pry bar.

You mean the serpentine belt . Do you ? If thats what you mean, the tensioner is a component that has a bolt at the middle which when lossened with a wrench will lossen the tension on the serpentine belt it has a spring and can be moved . if it was a seperate belt it woud have a bolt and a brace with a U shaped hole in the middle. You would lossen the bolt and pull on the belt and it lossens up.

nope just the idler pully or the belt tentioner