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Q:

heating the car on 2002 Mercury Sable

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
What would be the problem if your heat is not heating up the car but it blows cold air.
(1) Answer
Verify that the engine is reaching operating temperature, if it isn't the thermostat may be stuck open. Here is some more info related to this issue: http://repairpal.com/i-have-no-heat-what-could-be-wrong