I'm changing nout the serpentine belt and need to know what to loosen to get sone slack in the belt. it"s a 2000 ford expedition with a 4.6l engine.

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.

If the belt is loose, it would slip and not provide enough power through the alternator to power the car. Check for excessive slack in the belt. It's common for new belts to develop some slack after initial use.

take a wrench to the drive belt tensor which is a spring loaded pulley off center from the belt path. this is what provides the tension on the belt.

Hope this helps:

Removal & Installation

1. Remove the air cleaner outlet pipe.
   
2. Rotate the drive belt tensioner clockwise and remove the drive belt.
   

Rotate the drive belt tensioner clockwise and remove the drive belt

To install:

1. Installation is the reverse of the removal procedure. Make sure the belt is routed properly
   

Accessory serpentine belt routing-Ford 4.6L, 5.4L, and 6.8L engines with A/C

Accessory serpentine belt routing-Ford 4.6L, 5.4L, and 6.8L engines without A/C

Please let me know if it's diesel because the routing is different.

log itno autozone.com

they have free tech solutions and diagrams...........

One of those "wheels" or TENSIONER PULLYS on your vehicle is the tensioner for the a/c compressor. You will need to look at it and see if there is an adjustment bolt behind pully. If there is, loosen center pully nut, then run adjustment bolt out to slack out the belt. Replace belt and reverse prosedure. DO NOT OVERTIGHTEN BELT,as you can damage pullys and or belt. Tighten to factory specs. Rule of thumb is pulling the belt out and check for slack. No more/less than one inch slack.

use a 15mm socket to loosen the tensioner,the bolt isnt supposed to come out but the tensioner turns,turn it enough to pull the belt off the alternator then there is enough slack to work with it.

here you go hope it helps

normally you can take a 1/2inch breaker bar and insert it in the hole on the tensioner pull down and take the belt off the alternator and also try autozone.com to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you

2.0L Engines
See Figures 11, 12 and 13
The accessory drive belt for 2.0L engines has no provision for manual belt adjustment, since these engines use an automatic belt tensioner. Drive belt slack is taken up by the automatic tensioner.
Movement of the automatic tensioner assembly during engine operation is not a sign of a malfunctioning tensioner. This movement is the tensioner self-adjusting and is required to maintain constant belt tension.
The belt tensioner has a belt length indicator. If the indicator marks are not between the MIN and MAX marks, the belt must be replaced.
Fig. 11: Drive belt routing-2.0L SOHC engine with A/C Fig. 12: Drive belt routing-2.0L SOHC engine without A/C Fig. 13: Drive belt routing-2.0L DOHC engine