Q: My heater up front blows cold. the heat in back works great.what is wrong on 2000 Chevrolet Tahoe

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Ive replaced the actuator under the dash and both in cab air filters what else could be wrong
(1) Answer
I did not do anything as yet,cant find temperature door actuator or location cabin filters.

this is 2000 chevy tahoe 5.3.
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