Question about 1998 Ford Expedition

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What other causes could there be for my heater not getting warm? We replaced the thermostat and it isn't that.

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There is a vacuum switch inline on the heater hose that is not opening up and letting the hot water go into the heater core.
replace the heater control valve on the heater hose coming from the water pump.

Posted on Nov 13, 2010

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Somewhere there will be a heater control valve on one of the heater hoses to your heater. These valves can rust up and not open after being closed all summer. Check the valve. If the valve is open and you have hot water on both hoses (check by feeling the outside of the hose) then your heater core is probably plugged and not letting water flow through it.

Posted on Nov 24, 2010

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Could be the heater core, blockage in the radiator

Posted on Nov 13, 2010

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Posted on Jan 02, 2017

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SOURCE: ONLY WARM AIR FROM HEATER,

The next possibility, if you haven't already thiught of it, is as simple as making sure there is enough water/antifreeze solution in your radiator. If the level is too low, your hoses will get hot, but there will not be enought water to circulate into your heater core.

Posted on Dec 18, 2010

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If your heater is not blowing warm air, your thermostat is probably sticking or your coolant level is critically low. When you start your vehicle, your radiator coolant begins warming up from being cycled through your engine block. One the cooland reaches a certain temperature (usually 130-150 degrees F.), your thermostat spring will retract and allow coolant to then pass into your heater core. However, if your coolant level gets too low, or if you are using a coolant mixture that has more water than antifreeze, thermostats have a tendency to rust and corrode and will stick. Thermostats can also go bad for what seems like no reason at all. The good thing is that usually thermostats are pretty easy to replace. It's the most common thing that would cause the problem that you're explaining. However, if changing the thermostat doesn't fix the issue, there is always the possibility that you could have a collapsed hose somewhere under your hood. If you change your thermostat and none of your hoses are in bad shape, you most likely will have a vacuum line to reconnect under the dash, as most heater controls in late model vehicles are vacuum operated. I'm almost positive that the thermostat will be your culprit though. **Make sure when installing the new thermostat that you use a new gasket or O-ring, whichever applies. Afterwards, start the vehicle and watch to see if you have any leaks around the thermostat housing and continue to observe until the temperature of the vehicle gets to normal operation temperature.

I hope this helps, and hopefully you'll have heat pumping through your vents in no time at all!
Have a great day and try to keep warm!

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