2008 Ford Escape idler pulley fell off

SOURCE: 1994 Ford Explorer idler pulley assembly

Or a junk yard.

SOURCE: Serpentine Belt on a 1999 Ford Escort ZX2

If you have a book picture your are screwed. You do have a tensioner but it is between air con and powersteering pullys. In front from under you can put 15mm wrenchopend with a nother for leverage pull center bolt down to release tension. simple.

SOURCE: Replace idler arm pulley

An idler arm is a steering component found on vehicles without rack and pinion steering. Your referring to an idler pulley. To replace: remove the belt, remove the bolt from the center of the pulley, replace the pulley and reinstall the belt.

SOURCE: Can't get A/C belt around pulleys on my 01 Chevy Tracker 2.5 V6

Removal & Installation

1.6L Engine
A/C Compressor Belt

1. Disconnect the negative battery cable.
2. Loosen the A/C compressor mounting bolts.
3. Pivot the A/C compressor towards the engine in order to relieve the tension on the belt.
4. Remove the A/C compressor drive belt from the pulleys.

1. Properly route and install the A/C compressor drive belt on the A/C compressor, the power steering (if equipped), and the crankshaft pulleys.
2. Adjust the A/C compressor drive belt to obtain 6-9 mm (0.24-0.35 in) deflection.
3. Tighten the A/C compressor mounting bolts to 13-20 f t. lbs. (18-28 Nm).
4. Connect the negative battery cable.

1. Disconnect the negative battery cable.
2. Remove the power steering pump and the A/C compressor drive belt.
3. Loosen the generator mounting bolts.
4. Pivot the generator towards the engine and remove the accessory drive belt.

1. Properly route and install the generator drive belt on the pulleys.
2. Adjust the alternator drive belt to obtain 6-8 mm (0.24-0.32 in) deflection for a used belt or 5-6 mm (0.20-0.24 in) deflection for a new belt.
3. Tighten the generator mounting bolts to 17 ft. lbs. (23 Nm).
4. Install the power steering and the A/C compressor drive belt.
5. Connect the negative battery cable.

1. Disconnect the negative battery cable.
2. Loosen the power steering pump mounting bolts.
3. Pivot the power steering pump towards the engine in order to relieve the tension on the belt.
4. Remove the power steering pump drive belt from the pulleys.

1. Properly route and install the power steering pump drive belt on the power steering pump and the crankshaft pulleys.
2. Adjust the power steering pump drive belt to obtain 6-9 mm (0.24-0.35 in) deflection.
3. Tighten the power steering pump mounting bolts to 22 ft. lbs. (30 Nm).
4. Connect the negative battery cable.

SOURCE: 2000 Hyundai Accent lower idler pulley

Yep Ron... go to http://www.hmaservice.com/ anb register (veh VIN). Afterward, you can navigate the site to find the information you seek (service bulletins, manuals, wiring diagrams, etc.).