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The cooling system in these cars needs to be filled through the top radiator hose. If you just put coolant or water in the radiator, the engine will have no coolant because the thermostat is on the inflow side. Filling it through the top hose gets coolant into the engine. The temp gauge will not register if no liquid is in the engine, and the heater will not work either. You can rent (and then return for refund) a pressure tester from most auto parts stores. Be sure the system is full of liquid, or you will have to pump it forever. The leak should be evident once the pressure is up.
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