Question about 1999 Lincoln Navigator
There are a couple of things you can try. The first thing would have been to check both heater hoses that attach to the heater core. When the engine is at normal running temperature both of these hoses should be equally hot with the heater turned on.
This would mean you have water flow through the heater core. This would mean the water valves are allowing flow and that a lack of heat would be from a failure in the ductwork under the dash. A flap or "door" is simply not changing position to allow airflow by the heater core.
You can get an accurate diagnosis by using the self-diagnostics built into your Climate Control head. The head is your Display screen. There is a way of keying in an activation sequence for this test. You may be able to find the sequence online, but the Codes are in a different group specific to the Climate Control.
You would need to identify the proper part under the dash by finding a diagram specific to your Model of car. You may look up the parts for sale online and see photos which will help you identify the parts.
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Posted on Dec 11, 2012
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Posted on Jan 02, 2017
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