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1999 Ford Mustang Question: why does heater blow cold air after it was blowing hot air

 

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tomgee, 2.3L 4 Cylinder, Plainview, NY, January 11, 2014, 12:33
 Rookie

heater strts to blow cold air after it seems to reach operating temp. turn off heat and turn back on a few times and blows hot again . is this car equipped with a heater control valve and would that be the problem thanks tom

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  • Answer #1

    G. T. Service Center (3112 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG January 11, 2014, 14:21
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     Master

    I'm not sure if that car has one, but if it did, it would be in one or the other heater hoses from the engine to the firewall. It could be low of coolant, or a bad blend/temp door actuator as well.

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    tomgee, January 14, 2014, 12:00
     Rookie

    thanks I will check those things out. where do I begin to look for temp door actuator?

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    ProfessorG, January 14, 2014, 13:52
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     Master

    Are you sure it's a 99, doesn't show a 2.3L since '92. Then it should be a cable going to the top of the heater box.

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  • Answer #2

    goodguy January 11, 2014, 19:04
     Master

    I agree with prof fords are famous for broken heater boxes

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    tomgee, January 14, 2014, 12:01
     Rookie

    thanks where do I begin to look is it behind glovebox?

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    goodguy, January 14, 2014, 13:59
     Master

    you should be able to see it from under the dash but it easier if you take the glove box out

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