Here's a step-by-step guide:
1. Identify the Power Steering Pump: Locate the power steering pump. It's usually a fairly large unit with a pulley, often near the front of the engine. It might have fluid lines connected to it.
2. Identify the Power Steering Belt: This is the belt that runs from the power steering pump pulley to another pulley (likely the crankshaft pulley, but it could be another accessory). It will be noticeably slack if removed.
3. Identify the Belt Routing: Carefully examine the belt path. Note which pulleys it runs over, and in what order. Try to mentally trace the path. Take photos with your phone if this helps. Look for any wear marks or debris on the pulleys indicating the belt's path.
4. Loosen Tensioner (if applicable): Most power steering systems use a tensioner pulley to make belt installation easier. This pulley is usually spring-loaded and can be loosened using a wrench. Locate the tensioner (often it has a bolt or a lever you can actuate). Look carefully for access to the tensioner; you might need a special tool or to maneuver a wrench into a tight space. This is the most critical step and requires careful observation. Some tensioners are automatic; some require a special tool to manipulate the tension. Consult a repair manual specific to your DeVille's year and engine to find the correct procedure.
5. Remove the Old Belt (if necessary): Once the tension is released, carefully pry the old belt off the pulleys.
6. Install the New Belt: Starting with the pulley furthest away from the tensioner, carefully route the new belt over each pulley, following the path you observed in step 3. Make sure the belt sits correctly in the pulley grooves.
7. Tighten the Tensioner: Once the belt is routed correctly, slowly tighten the tensioner pulley, allowing the belt to seat firmly on all the pulleys. Use the proper torque specification; overtightening can damage the belt or pulleys. (Consult your repair manual for this).
8. Check Belt Tension: After tightening the tensioner, check the belt tension by pressing firmly on the longest span of the belt between pulleys. There should be only a slight give – usually no more than about 1/2 inch of deflection. If the tension is incorrect, loosen the tensioner and adjust the belt's position before tightening again.
9. Reconnect Battery: After verifying everything is correctly assembled and the belt tension is correct, reconnect the negative battery terminal.
10. Start the Engine: Start the engine and carefully listen for any squealing or unusual noises from the belt. If you hear squealing, turn the engine off immediately and recheck the belt tension and routing.
Crucial Considerations:
* Repair Manual: The absolute best approach is to find a repair manual specific to your Cadillac DeVille's year and engine. These manuals have diagrams and detailed instructions. You can often find these online (e.g., Haynes, Chilton) or at auto parts stores.
* Professional Help: If you're uncomfortable performing this repair yourself, it's always best to take your vehicle to a qualified mechanic. Incorrect belt installation can lead to serious damage to your car.
* Photography: Taking clear photos before you start can be invaluable in helping you remember the belt routing.
Remember, safety is paramount. If you're unsure about any step, seek professional assistance.
