I have no heat all I get is cold air
I have a 97 dodge dakota
Try Back flushing the heater core.
If this answer is acceptable please remember to return and mark it.
The problem is likely a defective thermostat that is stuck in the "open" position.
When that happens, the coolant moves rapidly through the system rather than staying in the engine until it heats up to 180-200 degrees. After the water heats up, the heater will work but your engine could also keep getting hotter without thermostat control.
Good thermostat will stay in the "closed" position until the coolant is hot, allowing your heater to have hot air and engine water to heat up.
I hope that helps. It's an easy job, check a Haynes service manual or Google it.
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