Question about 1998 Ford Expedition

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Why does my heat blow warm air then it turns cold

It blows warm for a few mins then it starts to blow cold I have to turn it off for a couple of minutes then turn it back on in order for it to blow warm again what could be the problem I just replaced the thermastat.

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Its VERY likely that your heater core is getting stopped up.

The heater in your car works by circulating hot water from the engine into a copper or aluminum pipe coiled up in the dashboard. The heater/airconditioner's fan blows across it and the hot air comes out of the vents. This is why the heater doesn't work right away when you first start the car. It usually won't work until the hot/cold needle in the gauges is starting to rise up.

If your mechanic recently replaced the thermostat, its possible that there is air in the system which will result in less antifreeze in the car than it should be. If this is not the case, the heater core is probably stopping up and will require expensive replacement if it cannot be flushed clean.

Check to make sure the car is full of antifreeze IN THE RADIATOR, AND THE OVERFLOW JUG. Please be very sure there is NO AIR in the cooling system as well.

Scott

Posted on Jan 22, 2013

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Here we might have a case ot "skin over mind" when it comes to distinquishing cooler from warm. Perfect comfort air at the registers (car or building) should feel slightly cool because if it felt warm to skin around 90 degrees, that would mean the heated space would soon be stifling warm. It's better to use fan speed. not overtemp, to speed up and maintain temp level in cabin. That said, the explanations above cover it pretty well, girl with sensitive skin. I would add that you might be runnng with AC on and it is toggling due to temperture fluctuation relative to evaporator over near the heater core. Now, AC On is not bad, really, especially with humid conditions and until temps in cabin stabilize. One way to check is on a cold humid day/night when you turn on defog and it seems to make windshield fog worse, not better. (It's a dew point thing withn the cabin with your steamy breath going everywhere.) But suppose instead, you see that opening defog clears the windshield very fast, as if you had turned on AC. That would be a sign the the AC is actually on because you are not getting the initial, normal heater out put of foggy air. So do check the AC setting along with heater setting when heat seems to be too cold or not quite hot enough. in spurts.

Posted on Dec 27, 2014

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Flush heater core. remove hoses and flush with tap water..

Posted on Jan 22, 2013

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SOURCE: Heater only blows hot air if I rev up the engine to about 4000RPM

make sure it has a thermostat

Posted on Dec 12, 2009

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SOURCE: AC blowing warm air

When they refilled the refrigerant did they put die in it to check for leaks, it sounds like there may be a leak.

Posted on Jul 24, 2009

Brian032472
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SOURCE: 2003 Ford Explorer is knocking and blowing cold air when I turn the knob to the heat

The blend door (mode door ) is a very common issue there is even an associated TSB t(technical service bulletin) it has to do with the blend door becoming warped and binding the accuator. In an opened or semi-closed position

Posted on Nov 19, 2008

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SOURCE: 2001 F150 Blows hot air when AC is on.

plse switec off 2hours

Posted on Jul 06, 2009

betz73
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SOURCE: 2002 ford explorer has no heat at Idel

The vehicle sounds to be low on antifreeze. Have your fluids checked and the radiator checked and top off fluids if need be.

Posted on Nov 07, 2008

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