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Q:

Heater does not work on 2003 Nissan Altima

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Car heater does not blow heat through vents or defroster onl cold air.
(2) Answers
Check the antifreeze level first in the radiator and the recovery tank (when the engine is cold). If its low, add as neccessary and get to a service facility to check for leaks. If the antifreeze is full (at proper levels) it will still need to go to a service facility and check other cooling system problems that may be causing your no heat issue.
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Possible blend door actuator or thermostat?