Question about 1998 Lincoln Navigator

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1998 lincoln Navigator --- 1. NOT overheating 2. A/C works and blows cold 3. NO Heat when temp is increased is this a heater core problem? Does the climate control module have anything to do with this?

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It can be the heater core but can also be the water control valve or the blend door actuator.

Please see my tip at . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

First make sure your heater control valve on the heater hose is actuating properly when you change the temperature. The valve looks like the picture below.
1998 lincoln Navigator ---
1. NOT - jturcotte_13.jpg
If this is working, check the temperature actuator under the dash. If you system is cable operated, the cable sheath may have slipped the clamp. Make sure the door opens and closes all the way wheh the control is switched from hot to cold. If you have questions along the way, please let me know.

Posted on Nov 07, 2010


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1 Answer

It's 20 degress outside and my 1998 navigator only blows heat from the rear vents, cold air from the front vents. What could cause this problem. I know the heating coil is not out because it blows heat in...

Hi, there is a separate heater core for the front vents, but my guess is your blend door actuator or the door itself is to blame. Just for grins, make sure both heater hoses are hot as they connect to the heater core in the engine compartment. If it's really the blend door, there is a pretty good answer at the following post:
Though it's a pain, I would check the actuator first. You have to remove the center console to access the actuator. Take it out to see if it's working (pull connector back in, turn key on and see if acturator turns when temp setting is changed). I also have a generic post on heater issues that may be worth your time to read ( Please let me know if you have any questions and thanks for using FixYa.

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1 Answer


check your antifreeze level, if its low then it will cause it to blow cold. or you could have a blend-air door problem under the dash: look for a loose vacuum line behind the glove bow for this. Or you could have a bad heater core.

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1 Answer

Heater wont blow hot air in my 1998 Lincoln Navigator

the computer that controls the deflector motor are not responding and opening the door for heat, I'm sure you have climate control,check the temp setting sensor to the computer input first

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1 Answer

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Sounds to me like a leaking heater core, probably just started. Quite an extensive operation to replace. If you happen to be in a cold climate, the windows will undoubtedly fog up. Hope this helps

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1 Answer

No heat

try changing your termostat

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2002 Lincoln Navigator. Heater is not working, it blows cold air. I had the thermostat changed and it stills blows cold air. There is no water leaks under the dashboard. It takes about 10-15 min for...

try changing the thermostat if thats not it check and see if you have water leaking in the passenger side floor board if so then you need a new heater core

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