How to change a water pump on a 1994 mazda millenia with a v6dohc

You water pump is ran off of the timing belt. To change your pump you will have to remove everything from the front of the engine.

pleas eopen the hood,find the steering pump of the steering,rotate the pulley to center the bolt,get a number 14mm socket wrench to remove the boltupper portion and the lower portionthen loosen the back bolt of the pump then retract the belt to loose then remove the belt

sounds like the water pump bearing is worn out and has detroyed the water pump shaft seal.
coolant is leaking thru the seal area ,due to the bearing worn out --hence throwing the water pump pulley out of alignment.
The water pump pulley runs of the timing belt.---hence the knocking --either from the pulley or belt chaffing against the timing cover or even throwing the engine timing a few degrees off.
Need to replace water pump and timeing belt and anything else that may be damaged.
That's why, when ever you do a timing belt always do the water pump too.

usually around 60,000 miles or 48 months, which ever comes first.

it is on the front of the engine, it is driven by the engine drive belt, large pulley

adjust the timing.

If theres no spark try replacing the rotor button and coil, not sure where the ballast resistor is located.

The water pump is located at the front of the engine ( where the timing belt is) To replace it you will need to remove the timing belt covers and the belt. If you have not tackled this sort of problem before i would recommend you purchase a workshop manual ( Haynes or similar) and that will show you the correct way to do it. Best of luck.

Check Your Timing It Must Be Wrong.
you would be better off buying the Haynes or Chilton repair manuals to avoid mistakes.
If Not Done Correctly This Will Result In A Very Costly Mistake.

Sorry to say but that's more than likely the water pump. The water pump is located in the timng line. You will have to take the timing belt off to change the water pump. While you're changing the pump you may as well chang the timing belt so you don't have to go through that job twice.

Hope this helps. Good luck.