Remove the cover on the interior by prying then remove the three bolts with a 10 mm ratchet and pull it out.
How do you replace the timing belt on a 1994 Geo Prizm 1.6?
See the related question: How do I replace the water pump on a 1993 Geo Prizm 1.8L?
Passenger side floorboard under carpet.
I know on my '98 Prizm it is accessible from the inside down low on the passenger side. Not an overwhelming job.
The 1996 Geo Prizm heater core is located behind the kick plate on the passenger side of the passenger compartment. The kick plate will need to be removed in order to view the heater core.
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From under the car.
Remove the old mount & replace with the new.
If you are referring to the water inlet hose on the back of the water pump you can use this question as reference. How do i replace the water pump on a 1993 Geo Prizm 1.8L?
The container is located under the hood on the passenger side wheel well.
It's underneath the carpet on the passenger side right under the dashboard.
You don't fix it, you replace it.