when i run heat it only blows cold air. new thermostat and bled system from blee on 2000 Chevrolet S10

bled system from bleeder screw. temp guage reads normal. is there a common problem that i should check?

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2 answers
Could be a multitude of things. Heater core could be plugged, heater control valve non op, or just the blend air doors malfunctioning.
Maybe, What engine¿?¿?!!!! IF 4.3 what bleeder screw?? Give more info. and we can too.
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