I need to changed water pump, thermostat and flushed old coolant?

Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/water-pump-replacement

Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.

What do you have for engine size
and you may need a special tools to remove fan clutch
in most it calls for about 3Hrs

No special tools. As far as other things to do, I would recommmend replacing the thermostat and flushing the engine block and radiator while it is apart. Also, inspect all hoses from the radiator and heater core for wear.

Believe it or not, the only thing holding that in place is a bolt that is mounted to the engine block. The end that is in the water pump only has an O-ring at the end of it. Carefully, turn and pull to get it out. If it gets damaged, you can get a new one at most parts stores for about 15 bucks. Make sure to place a thin coating of coolant on the new o-ring when replacing it.

It is not easy to get too. The upper hose fas to come off at least. I am attaching a pic of a 318 with hose removed and the location from which it was removed from is circled.
I happen to have the MOPAR part # as you should replace it because it is difficult to get to.

Bypass hose [Mopar P/N H0063735]

I hope this info helps. Let me know if you need anything else.

Here are the general steps:

1. Remove the radiator.

When removing or installing the constant tension hose clamps from vehicles so equipped, use only the correct clamp tool, such as the Snap-On No. HPC-20, or equivalent.

2. Loosen all accessories that are belt driven and remove the belt(s).

3. On engines without air conditioning, remove the alternator bracket attaching bolts and tie the alternator and bracket out of the way.

4. On engines with air conditioning, remove the idler pulley assembly, alternator, and adjusting bracket.

5. Remove the fan blade, spacer (or fluid unit), pulley, and bolts as an assembly.

To prevent silicone fluid from draining into the drive bearing and ruining the lubricant, do not place the thermostatic fan drive unit with the shaft pointing downward.

6. Disconnect all hoses from the water pump.

7. Remove the air conditioning compressor front mounting bolts.

8. Remove the water pump-to-compressor front bracket bolts and the bracket. Remove the water pump.

Do not disconnect any refrigerant lines from the compressor.

To install:

This component is subjected to constant high pressure from hot fluid and must be sealed correctly or it will leak.

9. Clean the mating surfaces prior to sealing the water pump.

10. Install the water pump on the engine. Use a new gasket coated with sealer.

11. Install the water-pump-to-compressor front bracket mounting bolts. Tighten the bolts to 30 ft. Lbs. (41 Nm).

12. Install the air conditioning compressor front mounting bolts. Tighten the bolts to 30 ft. Lbs. (41 Nm).

13. Reconnect all hoses to the water pump.

14. Install the fan blade, spacer (or fluid unit), pulley, and bolts as an assembly.

15. On engines with air conditioning, install the idler pulley assembly, alternator, and adjusting bracket.

16. On engines without air conditioning, install the alternator and bracket.

17. Install the drive belt(s).

18. Install the radiator. Fill the cooling system and adjust the tension of the drive belt(s).

Let me know if this helps.

Joe