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Q: where is control heater valve located on 1997 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
truck was blowin hot goin down the road it would get cold then go hot now stuck cold
(1) Answer
No heater control valve on this truck.

Figure a probable thermostat problem. Check engine temperature and coolant flow first.