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Q:

heater blows cold air on 1997 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when i turn heat on no heat just cold air
(1) Answer
(2) Comments
There are multiple reasons you could be getting no heat. First, the engine may not be getting warm enough fast enough. This could be from a faulty thermostat - sticking open. Second, the heater core may not have flow. You might have a hot hose going in, but a cold one coming out. This could be from a restriction. Third, you may have a temperature blend door motor in the dash failed.

Testing is in order to determine your failure. Good luck!
Where is the blend door motor located
Behind the dash, on the heater plenum assembly itself. The dash must be removed to have access to it.