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My 1999 Lincoln Navigator blows cold in the front and hot in the back, what is the problem

The heater blows cold in the front and hot in the back

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Is the rear HOT, or outside ambient temp? The good news is the A/C seems fine, rather a valve(vent)is stuck. check vacuum hoses. I think you need to do some fault isolation. MIGHT be faster to start from the rear since you know that's the termination point. You could even use some sort of bore scope on the end of a flexible object. Seeing is always the best Dx, IMHO. You can find one on Ebay for $20 or less. Once I acquired it I was amazed at how often I use it, both in the garage and the house. Just cleaned my dryer, and it allowed me to see what was left, which allowed me to concentrate on those areas. Many are also waterproof so you can check out plumbing.

Posted on Dec 05, 2014

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Posted on Jan 02, 2017

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1 Answer

The heat in my nlincoln navigator only blow out cold air


are heater hoses hot there is a valve in the heater hose check to see if it is open if thats ok the door that controls the heat is not working located on top of the heater box usually not to easy to get to

Feb 09, 2011 | 1999 Lincoln Navigator

1 Answer

The heat is not getting hot in the front but the back heat blows out hot heat. Whats the possible problem?


If you can get cold air blowing out the front vents, the front heater door is not working properly. If you don't get air blowing out, check the front heater fan and its resistor block.

Jan 14, 2011 | 2001 Lincoln Navigator

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Heater core installed, dash all back together finally - rear heat working, front blowing cold air... Please help.


are the pipe that feed the front heater getting hot ?? if so check the flap operating device ,have you fitted the vacumn pipes back in the right places ?? did you write them down before you pulled them off so you knew where they went

Jan 01, 2011 | 2000 Lincoln Navigator

1 Answer

1999 Lincoln Navigator stops blowing hot air


Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Jan 01, 2010 | 1999 Lincoln Navigator

1 Answer

Having problems with my a/c on 99 lincoln navigator. At times a/c will blow cold air, as soon as I hit the the accelarator I hear a sound that resembles the closing of a vent and it immediately blows hot...


Typical ford Check on the firewall for all your rubber vacuum hoses where the heater hose goes into the firewall if one is broke as you accelerate the vacuum makes the heater switch open giving you heat

Jun 03, 2009 | 1999 Lincoln Navigator

1 Answer

Problem with front air switching to heat when accelerating


Check for a vacuum leak. WHERE is the magic question.

Mar 26, 2009 | 1999 Lincoln Navigator

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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

Jan 05, 2009 | 1999 Lincoln Navigator

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