Question about 1997 Buick LeSabre

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Heater not working as it should

I have dual climate controls, when car is warmed up, I can turn up heat all the way on the driver side and it's pretty lukewarm. Passenger side air turned all the way up is cold. Air conditioning works fine on both sides. Thinking it could be the heater core being plugged, but not sure where the hoses go into to check incoming/outgoing. Thanks.

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