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Q:

Heater on 2002 Nissan Quest

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The heater and defrost work but no heat comes. The heat comes out only when driving. Why?
(1) Answer
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Most common reason that you will have heat when driving and not at idle is that there is an air pocket in the cooling system. This can be caused by a leak in the system. I would recommend that you have this checked out immediately. An air pocket in a cooling system can cause a large amount of damage if it's not caught early. Best of luck