Why would the heater in a 99 Ford Taurus SE suddenly stop working?

Answer 1

Assuming the temp gauge stays in the normal range (otherwise check thermostat and associated engine hoses etc).

The heater core has a blockage, Check the heater core hoses that enter the firewall from the engine compartment they both should be warm after the engine warms up if just luke warm you have a heater core/hose blockage- remove the two heater core hoses that enter the firewall from the engine compartment. Remove the blockage by flushing the heater core with fresh water from a garden hose.

AnswerI can't answer the question, but I think I have the same situation. What I've noticed is that if I put the car in neutral and rev the engine (3000+ rpm), hot air will blow from the heater. AnswerYou might check the heater a/c blend door under the dash just to the left of the glove box. This is an electronic controlled door that adjusts the amount of hot and/or cold air coming out of the registers. These are known to fail. AnswerIn the above answer, I ment to say the electronic unit that controls the door can fail. Not necessarily the door itself. AnswerI have a 1999 Ford Taurus with 45,000 miles on it. I bought it new 7 years ago. Last year I had to have the steering rack replaced. Also, last winter my heater stared to give me trouble. It would blow warm air but never get hot. I recently took it to a shop that specializes in radiator and heater repairs, they blew out the heater core and now it is operating as it did when it was new, plenty of heat. It cost me $70 this was the best money that I ever spent.