Q: Why does my 97 the AC switches to heater on it's on?
on 1997 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When I turn my air conditioner on it runs for a little bit then there's a sound like a vent is closing on the inside then it blows hot air.
(3) Answers
There is a heater control valve under the hood, IF this valve is not stopping the flow of HOT coolant from entering the hvac unit, that will cause this problem! Located in the heater hose near firewall.
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