how to replace a water pump on a 1996 plymouth neon
Option #1:
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Purchase service manual for 1996 Plymouth Neon (Factory, Haynes, Chiltons, or equivalent).
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Read through procedure in manual.
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Purchase, borrow, or rent tools necessary for job.
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Carefully follow instructions in manual and replace water pump.
Option #2:
Take car to mechanic and write check for repair work.
This job is basically a timing belt replacement, with the water pump service tossed in because the two jobs are always done together. Here is an illustrated guide: http://jball.neons.org/howto/timing_belt/howto.html. After reviewing the hellacious instructions you may decide to bring your car to an experienced mechanic rather than trying to DIY.