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Caan a defective water pump cause heater malfunction

(2000 Ford Taurus)
in Simsbury, CT on January 10, 2014
The heater blows only cold air. Can this be caused by an inefficient water pump and/or thermostat frozen in the open position?
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Popular Answer
on January 10, 2014
Either one can cause that but so can several other things. I always start with a new T-stat and go from there.
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