A/c works, but blows out of defrost, and floor vents, how do you correct this? on 1997 Pontiac Bonneville

where are the doors under the dash?

Asked by for the 1997 Pontiac Bonneville
1st ck for a vac leak going into acr from eng. this small vac lines break at times and will play havic on a/c controls like your having
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