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Why won't the heater change from dash to floor or to vents in a 1995 Firebird?

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Answered 2009-07-23 14:32:42

The lvl select door is vacuum operated. I'm not sure where the vacuum block is located on this year, but if u look in a manual it will help.

You should see the vacuum lines under the hood on the firewall. There is a black housing that they connect into. Replacing that housing should fix the problem unless you have a cracked Vacuum line. You can get a cheapy T shaped line at most parts stores.

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There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.

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the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater

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Warm(er) air rises - if vents were high up there would be little circulation without fans.

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Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.

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Could be that your heater core is leaking May also have a plugged evaporator hole.

Why would the ac and heater blow air through the defroster or the dashboard vents but not through the floor vents.?

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Can return air vents be put in the floor instead of the wall of a house?

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