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I have the same issue, sounds like a blend door problem. Could be up to 800.00 to fix it....My 1999 Expy would blow out cool air if I played with the controls, now I only have hot air. The rear air works fine when changing the temps

you may also try the heater valve which is under the hood , the heater hoses hook to it .. i have a 99 expy with a 5.4 and my front and rear heat were dramatically fdiff. in heat neither were hot .. i changed the heater valve and waalaa .. now 16 degrees 15 mins snow melts off my windshield .. u ...

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βˆ™ 2015-07-17 17:38:02
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Q: Why would only warm air blow from the front heater of a 1999 Ford Expedition with climate control?
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