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

The heater blows only cold air. Can this be caused by an inefficient water pump and/or thermostat frozen in the open position?

by in Simsbury, CT on January 10, 2014
1 answer
ANSWER by , 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.