get very little heat,w/blower on. Thermostat is Ok 190deg.coolant level OK ??

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Checked heater core temp.on hoses in & out and it seems same temp is hot evenly in and out. with blower working heat-drops Radiator liguid level OK. Temp. control-knob & cable seems to be operating can hear damper changing position from cold to hot. can't find a heater control valve... What can it be????