I'm changing the water pump on a 99 silverado with

One most chevys in the 90's.The belt tensioners have a sqaure slot undr the idler pulley on the tensioner that a 3/8 socket extention fits neatly into . Put it on a socket wrench put the extion in to the slot and push the preload spring bascily the tensioner toward the center of the engine and the belt fall off . Make sure you know to rooting of the belt you may want to take a picture if there is no decal. Then install in reverse order with the belt going over the tensioner pulley last

The serp belt tensioner will be in between the alternator and the power steering pump. Use a 3/8 ratchet and insert it into the square hole of the tensioner. Rotate the tensioner to remove the tension from the belt.

It doesn't hurt to draw a picture of the belt routing before removing the belt. Most GM's will have a diagram of the belt routing. I think yours is located on the plastic cover that is near the water pump.

If you don't have a diagram the belt is routed like this.

From the crank pulley the blet goes to the a/c compressor then under the water pump pulley then over the power steering pump and the alternator. then down to the p/s pump, over the tensioner pulley and finally ending up at the crank pulley.

Let me know if you have any question and I'll be happy to help. Thank you for using fixya.com!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Here is the complete procedure to replace the pump on your 99 Deville.
You will need to purchase the special water pump removal/installation tool.
1. Drain the cooling system.
2. Remove both radiator hoses
The water pump is on the right hand side of the engine and is driven by a pulley that comes off of one of the overhead cams.
3. remove the air cleaner assembly.
4. remove the pulley guard.
5. loosen the tensioner and take the belt off of the pulley.
If you decide to replace the belt you need to remove the tensioner, remove the studs that the pulley guard came off of and the tensioner will come out.
6. remove the water pump housing cover. the thermostat housing is bolted to this cover. it has (4)10mm bolts that hold it on.
7. using the special tool, turn the water pump clockwise (it twist-locks into the housing) and remove it.
8. clean all sufaces, replace both o-rings.
9. CAREFULLY! install the new pump with the special tool. be careful that you turn it all the way in counter-clockwise but that you don't pull too hard. The pump has steel tabs that lock into grooves in an aluminum housing. if you damage that housing by forcing the pump too hard you will cost yourself a ton of time and money.
10. re-assemble the engine in reverse order as disassembly.
don't forget to use your torque specs. You are working with aluminum castings

1. Drain the cooling system until the coolant is below the level of the water pump.
2. Loosen the water pump pulley bolts.
3. Rotate the drive belt tensioner to release the tension on the drive belt.
4. Remove the drive belt from the right idler pulley.
5. Carefully release the drive belt tensioner spring tension.
6. Remove the water pump pulley bolts.
7. Remove the water pump pulley.
8. Remove the water pump bolts.
9. Remove the water pump.
10. Remove the water pump gasket.
11. Clean the water pump mating surfaces.

To install:

Fig. Remove the mounting bolts (3) to remove the water pump (1) and gasket (2).

1. Install the water pump gasket (2).
2. Install the water pump (1).
3. Install the water pump bolts (3). Tighten the bolts to 10 Nm (89 inch lbs.).
4. Install the water pump pulley. Loosely install the pulley bolts.
5. Insure the drive belt is properly centered on all the pulleys except the right idler puller.
6. Rotate the drive belt tensioner away from the drive belt.
7. Install the drive belt to the right idler pulley.
8. Release the tensioner allowing the drive belt tensioner to come in contact with the drive belt.
9. Inspect the drive belt to insure the belt is properly centered on all the pulleys.
10. Tighten the water pump pulley bolts. Tighten the bolts to 25 Nm (18 ft. lbs.).
11. Fill the cooling system.
12. Inspect the cooling system for leaks.

This is job isn't bad. The water pump is on the front passenger side on the top. Loosen the three bolts on the pulley. Pull back on the tensioner to loosen the belt. Remove the pulley. Then remove the 5 pump bolts.

Kia Sorento 2003-05
Water Pump - Removal & Installation

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Drain the cooling system.
3. Disconnect the negative battery cable.
4. Remove the drive belt and the water pump pulley.
5. Remove the timing belt cover, timing belt, auto tensioner and idler pulley.
6. Remove the water outlet fitting, the thermostat case and the water pump fitting.
7. Remove the water pump mounting bolts.
8. Remove the water pump.
   



Fig. Water pump and timing belt assembly-exploded view

To install:



Fig. Water pump bolt locations

1. Clean the gasket surfaces of the water pump body and the cylinder block.
2. Install the new water pump gasket and pump assembly. Tighten the bolts to 12-16 ft. lbs. (17-22 Nm).
3. Install the water pump fitting, the thermostat case and the water outlet fitting.
4. Install the auto tensioner and timing belt. Adjust the timing belt tension, then install the timing belt cover.
5. Install the drive belt, water pump pulley and then adjust the auto tensioner.
6. Refill the coolant.
7. Run the engine and check for leaks.

1. Before servicing the vehicle, refer to the Precautions Section.
2. Drain the cooling system.
3. Disconnect the negative battery cable.
4. Remove the drive belt and the water pump pulley.
5. Remove the timing belt cover, timing belt, auto tensioner and idler pulley.
6. Remove the water outlet fitting, the thermostat case and the water pump fitting.
7. Remove the water pump mounting bolts.
8. Remove the water pump.

To install:




Fig. Water pump bolt locations



Fig. Water pump O-ring installation

1. Clean the gasket surfaces of the water pump body and the cylinder block.
2. Install the new water pump gasket and pump assembly. Tighten the bolts to 12-16 ft. lbs. (17-22 Nm).
3. Install the water pump fitting, the thermostat case and the water outlet fitting.
4. Install the auto tensioner and timing belt. Adjust the timing belt tension, then install the timing belt cover.
5. Install the drive belt, water pump pulley and then adjust the auto tensioner.
6. To adjust the drive belt tension, hang the belt on the pulley of the tensioner and install the tensioner.
   NOTE If the tensioner is already installed, loosen its mounting bolts to allow belt installation
   
7. Install the drive belt.
8. Adjust the belt tension to specification by turning the adjusting bolt clockwise or counterclockwise.
9. Air conditioning belt tension should be 0.28-0.039 inch. Alternator belt tension should be 0.39-0.051 inch. Power steering belt tension should be 0.31-0.051 inch.
10. Torque the tensioner assembly bolt to 33-36 ft. lbs. (45-50 Nm).
11. Refill the coolant.
12. Run the engine and check for leaks.

TY for using Fixya; remember comment and rated this.

There is a pulley out of alignment. Only 1/8th inch out will cause a serpentine to sqeak.

yes chaange your tension and or the idle pulley

Is it a 99 or an 03? Either way fairly simple. You will need to remove the splash shield on the passenger side wheel well. Removing tire is optional. If it is a 99, the pump should be located near the radiator. Loosen the bolts that hold the pulley on the pump before removing the belt. This will save you time later. Remove the belt, then remove the pulley. Take all the bolts out of the waterpump. Install in reverse order. If it is an 03, it is near the firewall side of the motor. Remove shield, loosen pulley bolts. The pulley will not come off until you get the water pump out, but you need to remove the bolts for it any way. Take the bolts out of the waterpump. You will need a pry bar to get the pump/pulley out. You can pry on the tensioner against the fenderwell and wiggle it out. Install in reverse order.

if you have a car quest their they can show you or print a belt routing pic