Do you mean no air comes out or only cold air comes out? If it's the
former, you likely have one common problem. You'll need to perform an
audit of the cooling system operation. This means you'll need to check
the level of the coolant in the radiator as well as verify that the
coolant flows and the fans operate when the coolant reaches the proper
temperature. You shouldn't drive the vehicle until you get this sorted
out. Depending on the situation, your engine could run hot without the
gauge indicating such, and result in damage to the engine.
If you mean that no air blows, you'll also need to check the blower fan
circuit.
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