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Caan a defective water pump cause heater malfunction on 2000 Ford Taurus

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The heater blows only cold air. Can this be caused by an inefficient water pump and/or thermostat frozen in the open position?
(1) Answer
Either one can cause that but so can several other things. I always start with a new T-stat and go from there.