Core is not plugged. air control moter seams to be working.but cant get heat out vents?
Could be a stuck blend door under the dash.
SOURCE: 2001 Chevy s10 with no heat
If you are certain there is no air in the coolant system, then there is a chance that the blend door motor is not working or the heater control assembly is bad. since you have replaced your own heater core you probably noticed the the doors inside the heater core housing. One of those doors is controlled by the "hot/cold" knob. The motor on that door could bad.
SOURCE: heater control 98 chevy s10 blazer
These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.
SOURCE: my 2000 s10 chev does not blow hot air on heat.the
The heat and cooling air flow is controlled by small plastic vacumn
lines inside the dashboard. The main vacumn suppy for this comes from
the engine vacumn lines. So - Find what you are missing in your
vacumn lines.
SOURCE: AIR VENT PROBLEM
Chevrolet 2003 TrailBlazer
For a digital air flow system try resetting the HVAC unit. Either take out the fuse for the HVAC module or disconnect the battery for 5 or 10 minutes. Reconnect battery or replace fuse. Turn the ignition to ON and DO NOT STARTor ATTEMPT to START ENGINE !!. You should hear the actuators, motors etc resetting. This should take about 2 minutes . Then you can start engine. If this does not work, you may have a bad actuator under the dash.
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