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Why would your ac only blow out the top defrost and not vents 92 firebird?
Wiki User
∙ 19y ago
Near the firewall under the hood, there is a little vacuum hose that has a plastic disk looking thing in the hose. This piece actually has to do with an engine backfiring, but that disk thing is probably cracked from heat and age. Needs to be replaced. If that is okay or you can't find it, Look for a vacuum hose going into the firewall, follow it to the intake and make sure it has vacuum. If it does, then the problem is inside the car, probably has a leaking vacuum line behind head unit or needs a head unit.
Wiki User
∙ 19y ago
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