the thermostat had nothing to do with that, water is not going into the heater radiator inside the car .... the valve that controls it is probably bad or not being actuated when applied... the control lever should be in the red section otherwise the hot water will not circulate inside the car thus no heat... check the hoses that go inside the car and see if they get hot,,,,good luck
the thermostat on a Mazda 626 is vey difficult to find i replaced it myself and i found out it was right under the air filter box.
Check the engine thermostat.
are the cooling fans coming on
The thermostat may need to be replaced.
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I replaced mine about a week ago. Follow the top hose coming from the radiator to a housing unit with 2 bolts. The thermostat is inside the housing.
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