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

by in Norfolk, VA on October 28, 2011
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1 answer 1 comment
ANSWER by , October 28, 2011
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 by , October 28, 2011
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.