Power steering pump 1991 Seville

Question edited for clarity.
Question moved to model category.

There is on one generic Cadillac video on this. It is a very old model.

https://www.google.com/search?q=1988+Cadillac+Deville+Sedan+replace+power+steering+pump

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hope this one help http://www.popularmechanics.com/cars/how-to/maintenance/3322636
This instructable is designed into four main parts. Here's the outline:

1) Gather the materials
-- Instructable step 1 - This includes tools, a new pump, fluids, etc.
2) Remove the leaking pump
-- Instructable step 2 - Drain the Power Steering system
-- Instructable step 3 - Remove accessories from Power Steering system
-- Instructable step 4 - Remove the pulley and bolts
-- Instructable step 5 - Remove power steering pump
3) Install the new pump
-- Instructable step 6 - Place the new power steering pump
-- Instructable step 7 - Press on the power steering pump pulley
-- Instructable step 8 - Align the pulley and attach the belts
-- Instructable step 9 - Flush and fill the power steering system
4) Cleanup
-- Instructable step 10 - Cleanup

You'll need some tools to complete this task. Before you start, gather the necessary equipment -- you will not be able to use the car once you start the replacement! It is always a good idea to have a friend on call, or a second car available.

Equipment list:

• Power Steering pump (to replace defective pump)
• Two (2) quarts power steering fluid or appropriate ATF (to flush and fill). More than 2 quarts if flushing the rack is desired.
• Power Steering Pulley Puller set (to remove and attach the pulley). Some auto parts stores will loan the tool sets.
• Socket set.
• Open end wrench set (for use with puller set).
• Leverage pipe or extension bar (in case the pulley is hardened on the spindle).
• Drain pan (to drain & flush power steering system).
• Wheel bearing grease for sliding pulley on the pump hub.
• 2' wood 1x2 for assistance with aligning the pulleys. Any straight tool will work fine -- a level, metal rod, wood, whatever.

Hello: You will need a puller. This item is available at auto zone or advance auto. You can buy it or they may have the puller/ installer on their tool loaner program. Follow instructions that comes with tool. When reinstalling pulley make sure you put it on correct. If you install pulley backwards there is no getting if off

Hello: The power steering pump and fluid reservoir sit on the top of the engine toward the radiator on the passenger side, there should be a cap on top in back of the pulley that will come off, on the bottom side of the cap there is a dip stick, fill the reservoir to the line on the cap. Use power steering fluid, DO NOT USE ANYTHING ELSE.

You can get a loaner pulley puller from autozone, and after you remove the belt you can pull the pulley.
You may have to remove the fan and radiator to allow room to work

Power Steering Pump - REMOVAL & INSTALLATION

3.0L OHV (2 valve) Engine
(see Figures 1 and 2)



Fig. 1: Power steering system-3.0L OHV (2-valve)



Fig. 2: A few special tools are required to remove and install the pulley on the power steering pump

1. Disconnect the negative battery cable.
2. Remove the accessory drive belt.
3. Remove the alternator.
4. Drain and remove the radiator coolant recovery reservoir.
5. Position a drain pan under the power steering pump underneath the vehicle. Disconnect the hydraulic pressure and return lines and allow to drain.
6. Remove the idler pulley from the power steering pump support.
7. Remove the bracket mounting bolt located under the belt tensioner mounting.
8. Remove 2 retaining nuts from the bracket mounting studs. Remove both mounting studs, and pull off the power steering pump support with the pump attached.
9. Clamp the pump support bracket in a suitable vise.
10. Remove the power steering pump pulley from the pump shaft using Pump Pulley Remover T69L-10300-B, or equivalent. Remove the 3 bolts retaining the power steering pump to the power steering pump support and remove the power steering pump.
    

To install:

1. Install the power steering pump to the power steering pump support.
2. Install the power steering pump pulley using Steering Pump Pulley Replacer T65P-3A733-C, or equivalent; the pulley face must be flush within 0.010 inch (0.25mm) of the pump shaft.
3. Install the power steering pump/pump support and torque nuts/bolt to 17-24 ft. lbs. (23-32 Nm).
4. Complete the installation by reversing the removal procedure.
5. Fill the power steering reservoir with power steering fluid.
6. Connect the negative battery cable.
7. Run the engine and check for leaks and proper operation. Bleed the power steering system if needed.

Hope this helps.

There are two things that control the power steering. The power steering pump and the steering gear. If there are no leaks then I would look to see if the power steering pump shaft is broken. Remove the serpentine belt and see if you can remove the pulley from the pump by pulling on it. If this is ok then there is a problem in the steering gear itself

Get a new cylinder put old key with chip in it. Find orange wire from old lock cylinder at bottom of steering column just under dash. Disconnect and connect new wire from new lock cyl. Get a copy of the old key for the old lock cylinder {no chip needed} to start car. Hide or mount new lock cylinder hidden under dash. Remove chip key to activate theft system.

you need to have a pulley puller to get the pulley off if you don't have one most auto zone part stores have a loan a tool program and they can help you with that on most powersteering pumps the high pressure line will be a fitting or bolt on and the return line is usually just a squeeze clamp hope this helps good luck

probably the rack is restricted or valve stuck in rack and pinnion steer .belt alignment also