Question about 2002 Nissan Altima
With the engine warm and the heat turned on, feel the hoses going through the firewall to the heater core. If one is hot and the other cold, you have a clogged heater core which must be backflushed to clear a blockage.
If the hoses are both cold, move up the hoses until you find a valve. This is the heater control valve. If it is hot on one side of the valve, that valve is clogged or shut. Investigate why the valve is not passing coolant - a clog or the actuator is broken/disconnected.
If both sides of the heater control valve are cold, replace the thermostat. While you have the thermostat housing open, make sure there are no blockages in the connection pipes.
Posted on Feb 05, 2010
Testimonial: "thans will do "
Run engine until warm. Feel the top radiator hose, is it hot ? If no then it may be your thermostat, or possible head gasket problem.
Posted on Feb 04, 2010
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Posted on Jan 02, 2017
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