2005 Camry XLE heating working after coolant flush and refill but not blowing heat on passenger side

So after a quick trip to the mechanic, I have heat again after a coolant flush and refill....kinda. Heat is now blowing from the
driver's side vents but passengers is blowing cool. What does this mean? Mechanic said thermostat and water pump appear to be ok.
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On 12/15/2016 7:15 PM, TCW wrote:

Took it to a nearby shop where they did a proper flush and blasted out the heater core with air. Tons of crap came out. It was clogged. Now heat works.
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