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Q: no heat
on 2002 Nissan Altima

I just replaced the sensor and the heat started working just fine now I have no heat again but it blows out cool/warm air
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what sensor???

check coolant level, check thermostat and see if the heater hoses are both hot.

did it overheat??? if it did, internal damage may have resulted.

Roy
I checked the coolant level and it was low so I added coolant and its warm now but now hot.it did not over heat. I changed the thermostat. And I changed some coolant package on the engine.
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