Agree...not a ton of room in there between the fan and tensioner arm. I used a breaker bar as well. Going to harbor freight and get that tool. Good find!
If you have a 4.6L...to relieve the tension on the drive belt, you need to insert a 1/2" drive breaker bar (or the above mentioned tool) into the square hole in the center of the idler pulley. Once it's in there, rotate the tool toward the driver's side. That will lower the idler pulley enough to remove the belt. Three bolts are the only thing holding the tensioner arm to the block.
Accessory Drive Belt, Tensioner and Pulley
Removal and Installation
To remove individual components, carry out only the listed steps.
Component Steps
Accessory drive belt 1
Accessory drive belt tensioner 1-3
Remove the components in the order indicated in the following illustration and table.
To install, reverse the removal procedure.
Item Part Number Description
1 8620 Accessory drive belt (Removal Note Below)
2 N808920 Accessory drive belt tensioner bolts (3 req'd)
3 6B209 Accessory drive belt tensioner
Item 1: Accessory Drive Belt Removal Note
Rotate the tensioner clockwise and remove the drive belt.