December 12, 2016. If you have air flowing only through the vents with no defrost or floor, this door is failing. The air only blows through the front defrost vents, the back air works fine. There's no/little air coming from the front dash vents on my wife's 2011 Acadia regardless of how the system is set. 2002 Buick LeSabre. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting dial but there is still no air at all to feet and defrost. There is just no air from floor vents or defroster. Air only blows out of front vents (not from bottom heater or defroster. No heat to feet or defrost. Reply. The air won't blow out the dash vents. Please HELP. Save Share. The main vent of the vents that faces the passengers blows out nothing. I am only getting air to come out of the front vents of the dash. It blows out the floor vent and the defroster vent, but it won't change and blow out the dash vent. I can three of four actuators, but I cannot locate the defrost actuator, it appears by following some wires, that it is on the top of the dash on the drivers side. I checked vacuum hoses and found one unplugged going to a valve that goes to the canister behind the battery. Replaced a small curve hose that was cracked going to another valve near the Egr valve. I am not getting any air coming out of my front vents. Air Conditioning will not blow out of front vents on Buick Rainier Problem Description Owners have reported several instances of the air conditioning not blowing through main dash vents, or only blowing through the floor and defrost vents. Years ago this was controlled by vaccum lines, but now everything is electronic.... - … On all settings it only comes out of the defrost vent. when changing from ac blowing to the face and leg to defrost u can here it switch but no ac comes out of the front vents. Most of the hose were wrapped in that plastic conduit. I have a 2007 Dodge Grand Caravan. My tundra ac is working but it only blows through the defrost vents. Any one know what I need to do to fix this problem? Heater working but only blows out front vents. The blower doesn't have any obvious damage and the front floor and rear vents … 06 2wd conversion, stock. Asked by genurko in Parlin, NJ on . RE: AC/heater only blows out defrost vents IP: Logged Message: I have a 2002 Dodge Dakota - 3.9 L and in June of 2007 I had only air coming out of my defrost vents, so I had the vent control motor replaced and it was working great, until about a week ago now the air is only coming out of my defrost vents again. 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