Serpentine Belt for 1988 Astro Van

Question edited for clarity.

Does it look like this?

https://images.app.goo.gl/1vY1ZuWhdxuZi6xA8

More here

https://www.google.com/search?q=1988+P20+step+van+6.2+serpentine+belt+diagram

,,

That isn't the way to do it. You should have a bypass pulley, which keeps the route and the angles and the same length belt.

Details of bypass and the serpentine belt diagram in the link

https://www.google.com/search?q=2006+Nissan+Altima.+Serpentine+belt+diagram+no+air+conditioning&tbm=isch&ved=2ahUKEwiT2pXX38H0AhWQsHIEHZE8ARMQ2-cCegQIABAA&oq=2006+Nissan+Altima.+Serpentine+belt+diagram+no+air+conditioning&gs_lcp=CgNpbWcQAzoHCCMQ7wMQJ1CQGliJTmC4aWgBcAB4AIABa4gBnwiSAQQxMi4xmAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=0femYdOtEpDhytMPkfmEmAE&bih=937&biw=1920&rlz=1C1QJDB_enCA643CA644

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If you are speaking of the main serpentine belt, a tool must be used to turn the belt tensioner against its spring tension thus making the belt loose.

you need to wire brush your pulleys so all grooves are clean and see if one of your engine components that run off the belt are loose or have a bad bearing good luck

time to replace the serpentine belt I betcha!

ps...you do not have to Post another Question....just Add a Comment to this question.

"HOW TO": I professionally prefer the Serpentine Tensioner Tool.
Standard Rules to Removal the Serpentine Belt with an Automatic Tensioner:
1. Find the Tensioner(s).
2. Using a Serpentine Belt Tensioner Tool, Or Wrench OR Ratchet, Rotate/Move the Tensioner USING THE AVAILABLE NUT (located on the Tensioner Pulley rotating the Tensioner Pulley/Arm - moving it away from contact with the belt and towards the area where the belt is not in contact with the Tensioner Pulley. The Tensioner is spring loaded, and is hard to rotate/move.
3. Remove the loosened belt off one of the other more easily accessed Pulleys.
4. DO NOT quickly release the Tensioner, but gently allow the Tensioner to rest in its closed position.

Standard Rules for Installing the Serpentine Belt with an Automatic Tensioner:
a. Pick a Pulley that is most easily accessed. This will usually be on top. This will be the last Pulley that the belt will go on.
b. Using the Diagram: Install the new Serpentine Belt on the remainder of the Pulleys....over, under, left right.
c. Using a Serpentine Belt Tensioner Tool or Wrench or Ratchet Tool: Rotate/Move the Tensioner Pulley and Arm "away" from Belt contact area on the Tensioner. This spring is pretty hard and with a new belt, it will be even harder to install. Rotate/Move this to as-close to the maximum allowed inorder to have enough slack in the belt to get it up and over the last pulley.
d. Using your other hand - Pull the Belt up and over the Last remaining Pulley.
e. Before releasing the pressure on the Tensioner, visually inspect the remainder Pulleys and the Belts' Positioning on them.

For the 1987 Ford Econoline Van:
Size Engine??
Engine Options (AC/No AC)??

Click on the following direct, Free Link. It has the Serpentine Belt Diagram for your 1987 Ford Econoline Van depending on your size Engine and Engine Options.

Let me know if this helped....

http://www.2carpros.com/car_repair_information/year/1987/make/ford/model/econoline/1987_ford_econoline_drive_belt_routing_diagram.htm

if you buy the Goodyear gator belt theres a diagram on box , and in my opinion the best belt

The serpentine belt is the most common cause for whining sound when accelerating, try to understand if noise is coming from serpentine belt.

Also check power steering belt under steering column, and also the rotor and chain, thei do not make whining noise , but can make noise when accelerating.

The belt is first suspect.

Diagrams WRITE BACK i need to know the Picture shows for you does on my end Fig. 32 Serpentine Drive Belt Routing. 4.0L/6-243 W/air Conditioning & Power Steering PLEASE RATE ME Diagrams Notes Fig. 30 Serpentine Drive Belt Routing. 4.0L/6-243 Less Air Conditioning