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    Heater-knob not changing where it comes out

    Yes the air flow (defroster, vent, floor) is vacuum controlled. The Temp (hot/cold) is controlled electronically (that's the blend door). Check your vacuum lines and reservoir. With out vacuum it defaults to defroster
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    whats it do...little 'knobs' in the rear

    and the cargo net is used to secure wild children :) Disclaimer: A Cargo net is NOT a suitable substitute for installed approved safety restraints (seat belts) and the use of the cargo net for restraining children (wild or otherwise) is Illegal in all states containing a vowel. Use a cargo net...
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    99 Expy No Vent Air?

    Probably still the blend door (although still check the actuator). What happens with the blend door, is the top of blend door hinge mates with the actuator and being a plastic part subject to dramatic changes in temperature becomes brittle and breaks. The blend door just stays in one position or...
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    Blend door issue?

    Most likely NOT the blend door (that is controlled electronically) Climate control system uses vacuum to direct the air flow (vent, floor, defrost etc..) so A vacuum leak would be different symptoms As mentioned above I would check your coolant level first, then water flow/thermostat
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    99 Expy No Vent Air?

    May possibly be the blend door or control for the blend door. I will look for a link to fault isolation and repair.. (had to fix it on my mountaineer) Check you blend door Actuator first (that is the motor that drives the blend door) with ignition in the on position vary the temperature from...
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