no heat could mean ur thermostat is bad and its letting the engine cool 24/7 instead of closing and letting it warmup .. or you u have a clog somewhere .. or vaccum door for the cold/heat air is stuck (thats what the middle control temp knob does is control a the cold/hear air door by vaccum.
Next time look at the engine temp, if its not up normal mark then the thermostat is staying open and letting the engine cool too much .. meaning its bad .. swap out and u get your heat back.
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I dont have an alero no more...
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