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 http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air . 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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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: http://heatertreater.net/Lincoln%20Navigator%2097-02.htm
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