The dash vents are the only vents that work. 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. I am not getting any air coming out of my front vents. Air only blows out of front vents (not from bottom heater or defroster. No heat to feet or defrost. The main vent of the vents that faces the passengers blows out nothing. I can switch it from hot to cold no prob. Asked by genurko in Parlin, NJ on . ... AC/Heat Only Blows out Dash Vents. Years ago this was controlled by vaccum lines, but now everything is electronic.... - … If you have air flowing only through the vents with no defrost or floor, this door is failing. Most of the hose were wrapped in that plastic conduit. After doing some research, I've tried resetting the HVAC system by temporarily pulling the fuse. 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. The air won't blow out the dash vents. Replaced a small curve hose that was cracked going to another valve near the Egr valve. 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. ... works. 2002 Buick LeSabre. Please HELP. 06 2wd conversion, stock. I have a 2007 Dodge Grand Caravan. Save Share. My blower speed works fine. On all settings it only comes out of the defrost vent. Reply. The air only blows through the front defrost vents, the back air works fine. It blows out the floor vent and the defroster vent, but it won't change and blow out the dash vent. No effect. 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. There's no/little air coming from the front dash vents on my wife's 2011 Acadia regardless of how the system is set. It blows hot air so I don't think there is anything wrong with they heating system. There is just no air from floor vents or defroster. Heater working but only blows out front vents. I checked vacuum hoses and found one unplugged going to a valve that goes to the canister behind the battery. The blower doesn't have any obvious damage and the front floor and rear vents … December 12, 2016. I am only getting air to come out of the front vents of the dash. 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