My heater does't blow air in the front but it blows in the rear

1997 GMC SUBURBAN
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STONEWALL79
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Once when we hit the ac button on the dash it came back on but warm air trickles out of it but it doesn't have the come on like it used to anymore.
Nov 11, 2011 at 3:11 PM
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HMAC300
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chec your actuators in teh heater generic pic enclosed.
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Nov 11, 2011 at 3:33 PM
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