2002 Nissan Altima Q&A

2002 Nissan Altima Question: no heat

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 -
Answer 1
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 -
Comment 1
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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