Question about 1999 Ford Expedition

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I have a 99 ford expedition with heating problems. It will heat in the middle section for about 15 seconds then you can feel it go to cold air. We have changed the blend door actuator, thermostat, and flushed it 3 times. 2 times with a water hose and 1 time we took it and had it done with acid. Keep in mind while they were flushing it with the acid it was working but about 5 mins after they were done it went back to cold air. Also, in the middle section it will work for about 10-15 seconds and then you can feel the hot air going cold. I turn it off for about 10 mins and turn back on and will be hot air for about 10-15 seconds and u can keep on repeating this process. Please help!!! It’s getting cold out and I have 3 kids!!!!

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Check if there is a vacumn powered valve in the heater hoses, if there is the vacumn hose may be faulty [ broken or crimped.] or the valve is faulty. good luck.

Posted on Jan 03, 2011


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