A water thermostat stuck open. Air in the heater hose lines (caused by low radiator coolant). Air temperature (mechanical) control cable not opening the heater hose water valve (under hood).
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Check the temperature sensor
Probably a bad starter solenoid.
$20.00 at advance auto parts
There are only two possibilities for the water leak in the 1993 Mercury Marquis. The car could have a leak allowing rain water in. Or, the drain for the ac could be stopped, and condensation is leaking into the car. The condensation is your most likely cause.
The correct type is 134A and should be listed as well as the capacity on a decal on the rad support or under side of the hood