This year and model doesn't have a heater control valve it uses what is called an electrically actuated air temperature control blend door to control heated air and AC temperatures.
SOURCE: 99 expedition heater valve
yes to the first question
and yes it is the blend doors
recommend get another unit for the control or take that control out and see if one of the tubes is broken off the control unit
SOURCE: I have a chevy astro van that has a broken heater vaccum line
some of them are dummies they are not vacuums,but if it is a vacuum line is it color coded?
SOURCE: our 2001 Chevrolet Astro Van heater not working?
Could be a bad heater core, any fluid leaking around it...check under the carpet and padding if you don't see anything under it on the ground. Your coolant may also be low, and it isn't circulating to the heater core, or a vacuum line may be off the hot/cold gate on the heater box, there are a lot of possible causes, but i would check for leaks and fluid level first
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SOURCE: high nox fail smog test any remedies? 99
NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.
SOURCE: Where is the idle air control valve located in a
You'll need to remove the interior engine cover(dog house).Torx screws for the covers, 2 bolts on floor. and bolts against the fire wall (i use a long extension with a swivel socket at the end). The IAC valve is screwed in to the side of the throttle housing (where the gas pedal hooks up to the engine).I can get a pic if you need it.
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