No heat?

1999 MERCURY MOUNTAINEER
13,000 MILES • V8 • 2WD • AUTOMATIC
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CHILLINS
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  • 4 POSTS
Heater problem V8 Two Wheel Drive Automatic
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when i am driving down the road and i have the heater shut off hot air is blowing into the floor boards of the front driver and passenger of the car. it blows hot air even with the temp turned all the way to cold. it does not blow super strong but does blow and is hot.
Jul 21, 2020 at 11:58 AM (Merged)
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MERLIN2021
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 17,250 POSTS
Auto temp control, or manual?
Jul 21, 2020 at 11:58 AM (Merged)
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CHILLINS
  • MEMBER
  • 4 POSTS
i assume the auto temp control is digital read out. here is a pic of my dash and behind the dash.


https://images.2carpros.com/forum/automotive_pictures/222398_P1010059_1.jpg


https://images.2carpros.com/forum/automotive_pictures/222398_P1010060_2.jpg

Jul 21, 2020 at 11:58 AM (Merged)
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MERLIN2021
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 17,250 POSTS
Sounds like the heat control valve on the heater water inlet hose, test this way.


https://images.2carpros.com/forum/automotive_pictures/62217_heata_1.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_heatb_1.jpg

Jul 21, 2020 at 11:58 AM (Merged)
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CHILLINS
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it does not do it constintly. when the car is stopped at a light you can barely feel any air. but when you are driving down the street then it blows out stronger.
Jul 21, 2020 at 11:58 AM (Merged)
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MERLIN2021
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  • 17,250 POSTS
Use a reciculation setting, or max a/c, this will close the flow of outside air off.
Jul 21, 2020 at 11:58 AM (Merged)
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CHILLINS
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[quote:6c65edb0d2="merlin2021"]Use a reciculation setting, or max a/c, this will close the flow of outside air off.[/quote:6c65edb0d2]

that is not going to fix anything. i want to fix the issue not simply make it so i can live with it. again it is doing all of this when the system is turned to the off position.
Jul 21, 2020 at 11:58 AM (Merged)