Question about 1999 Lincoln Navigator

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2002 Lincoln Navigator will not heat, blows cold air

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. Please advise

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  • jonathan7504 Jan 05, 2009

    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 take about 10-15 minutes for the engine to reach normal operating temperature.

  • jonathan7504 Jan 05, 2009

    How can I tell which hose are going to the core?

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4 Answers

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Please go for the link for ac problem:
http://www.wikihow.com/Fix-Your-Car's-Air-Conditioner
Thanks for using FixYa

Posted on Jan 05, 2009

  • rockfixya
    rockfixya Jan 07, 2009

    please check the link given by me.
    Thanks for using FixYa.

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Hi and welcome to FixYa,

Initially, determine if the coolant is circulating inside the heater core. This could be done by warming up the engine, switching on the heater inside and carefully feel the feed/incoming to the heater core which should be hot and then the out line from the heater core. If the out is also hot, then chances are the core is good, no clogs/blocks and problem is inside/under the dash. If the out port is cold, then the heater core is blocked and would require replacement.

If both in and out are hot, then primary suspect would be the vents/vanes directing where the airflow would be coming from. Often these are mechanically coupled to the levers/switches by lingkages. These vents/vanes do get stuck in one position (least likely). Although (most often/likely) it could be that the lingkages are detached, twisted, out of position or simply have dropped off. This is a relatively quick check/repair, the challenging part is getting access to these vents/vanes not only being under the dash but often encased in an airbox of sorts.

Good luck and Thank you for using FixYa.

Posted on Jan 05, 2009

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Did you check the coolant level. There is a range where you will loose heat but yet not overheat the engine. If that is okay, then start by making sure that the thermostat is okay. If it is stuck open during cooler temps, it is possible to get nearly cold air.
Many cars (I'm sure yours included) have a water valve located in the heater hose usually not too far from the firewall. The valve are known to fail by either the valve sticking, or the rubber in the valve swelling and completely blocking water passage.
It is not very likely for the heater core to become so badly blocked as to get only cold air, but if that were the case you could tell by feeling hoses going to the heater core. One would be hot and the other would be cold. This would also be the case if the valve is not allowing water passage. 

Posted on Jan 05, 2009

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Check out this other options
Low coolant? ---------
System airbound? ------------
Thermostat not operating properly?
Heat control cable not operating?
Selector switch not operating?

Posted on Jan 05, 2009

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SOURCE: 2002 Lincoln Navigator. Heater is

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

Posted on Feb 24, 2009

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