Heater problem

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Heater problem

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Ford >> Ford Trucks, Ford Vans & Ford SUV's >> Ford Expedition >> Heater problem

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Heater problem - 3/10/2007 10:57:04 PM

snipe401

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Hello:

I have a 1999 Expedition which I love dearly. Best vehicle I ever owned. However, the heater has just started acting funny. The front heater will not blow hot air, no matter how I set the temperature. The A/C works fine, but the heater in front blows cold air. Defroster is cold only too. The rear heater works fine. No problem. I purchased a shop manual, but can't for the life of me figure out what's wrong. How can one heater work and not the other ?

I read somewhere that it might be a problem with my "Blend Door". What the hell is a blend door and where on the vehicle can I find it ?

Post #: 1

RE: Heater problem - 3/10/2007 11:42:32 PM

Hayapower

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The blend door is in the Heater A/C plenum. It's function is a 'flow gate' for heat and A/C temp control.. It's driven with a blend door motor..

Here's a couple of images of the blend door.. One in the 'OFF' position and the other showing HEAT/ Blower 'flow' through the heater core..

Thumbnail Image

Thumbnail Image

Attachment (2)

< Message edited by Hayapower -- 3/10/2007 11:52:29 PM >

_____________________________

05 F250 C/C FX4 6.0
1969 Firebird Trans Am
2003 Hayabusa GSXR1300

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RE: Heater problem - 3/11/2007 11:55:28 AM

snipe401

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Great info. I see how it works. Where exactly is it located though. Is it something I can get to and try to work on, or is this a dealership issue ?

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RE: Heater problem - 3/11/2007 1:48:06 PM

Hayapower

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The Plenum Chamber is located 'behind' the intrument panel, and behind the glove box area on over to about the center of the dash.. If you have a no heat issue it should be diagnosed as to the cause prior to any dash work if possible.. If a bad blend door, or door actuator/motor is the cause, then it's a 'sizeable' job to complete..

_____________________________

05 F250 C/C FX4 6.0
1969 Firebird Trans Am
2003 Hayabusa GSXR1300

(in reply to snipe401)

Post #: 4