ok so after you replaced these cooling system items the car stopped running ?
have you looked inside the distributor cap for any water inside ?
something is wet like a connector or the ignition system
did you disconnect any ground wires from the thermostat area?
i havea feeling a wire is either disconnected or damaged and this would be a ground wire.
ok please look good this is a very common thing that happens 1 little ground wire and the car will not start. make sure you look good around the area you worked in.
Dino
would the check engine light come on if there was a code set
Technician
have lots of general auto exp in all cars over 24 yeas in this profession