If the car is otherwise running well, replacing the thermostat is not going to fix a heater. the plug wires also have nothing to do with the heater. the heater is a small radiator inside a box which is inside the car, generally under the dash behind the glove box. you do not say how old your car is but if it is 9 or more you could well have a bad core, they corrode and plug up with age, either condition will stop the heater from working, but the engine will continue to run OK. there are two heater hoses under the hood coming from the engine which connect to the core at the firewall. if the engine is warm and one of those hoses is still cold then you are not getting circulation through the core and it is not going to work for you.
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