Chrishawn Green. Temp up and down and fan speed does work. I can switch it from hot to cold no prob. Difficulty Scale: 3 of 10. Easy step by step guide one how to troubleshoot and repair vent low air flow, this article pertains to most vehicles. My 09 Enclave had this issue, and indeed it's a blend door problem. Categories Arts & Humanities. The mode actuators in this vehicle are vacuum controlled so checking vacuum is the first point in the diagnostic routine. Because when Ford put the “mode door actuator” on their vehicles it was notorious for failing for several model years and it was a real pain to get to. Accessibility. It is usually between the engine intake and the vacuum reservoir. My blower speed works fine. why is does air only blow through floor vents or defrost vents? - Oldsmobile 1996 Ninety Eight Regency question Please help, this is my wife's car and she is panicking because defrost won't work. Turn the ignition and the fan switch to the "OFF" position. Roberto Marquez. My wife's 2002 Cougar will only blow heat or AC through the defrost vents. Where do the hoses lead to/what do they do? I know the blend door actuator that is located behind the glove box controls the temperature of the air flowing to the vents but are there other actuators (outside of the mode door)? My blower speed works fine. The A/C and heat work fine but only blows out the defrost vent on the dash. Relevance. When the controller "sees" cool air it commands the blend door to change air vents. where are actuators located - Chevrolet 2004 TrailBlazer question I can switch it from hot to cold no prob. buzz1 in Stockton, CA on . Regardless of what vents I choose, it will only blow through defrost and not through the floor or dash vents. Discussion ... that is not directing the air flow to the other vents. bea_atine_49. It controls the changing of air out different vents. What if I replaced blem door and still doesn't work properly, You will need to check the vent actuator to see if its functioning. August 12, 2011. I have a 2004 GMC Sierra 1500 with the duel climate control A/C. It is blowing cold air, but will only blow from the floor and defrost. @rmarquez1958. Having the same problem, regardless of the position selected, air will only flow through dash registers. Answer Save. Air only comes out on floor and defrost at the same time. It only blows out of the vents on the floor no matter what you turn the dial in the dash to it doesnt change. Heater working but only blows out front vents. Do they circulate coolant to the heater core? As stated in the title, I am only getting air blowing out of the defrost and floor vents but not the ones in the dash. These are usually located behind the dash. I suspect it may be a check valve issue but from what I’ve seen online, getting to it would likely require the removal of the blower motor, heater core, draining the coolant and possibly the refrigerant as well. Look above the brake/gas pedals to see if it’s located there. I have heard some people say it is probably a vaccum hose issue. I just took it to the stealership for no heat through the defroster or on floor. No defrost or dash air when you try to control flow. Yes it will blow cold or hot as you control the temp. There is a vacuum check valve somewhere in the hoses leading to the HVAC control unit. I have a 97 z71 and the AC blows pretty cold, but that isnt my problem. Step 1 - Most air control vents are equipped with a flow control door that is located at the vent outlet. I don’t know if it was also happening when blowing heat from the vents though as it was summer time when I noticed the drop in air flow. You might get lucky. There is just no air from floor vents or defroster. I know there is often a faulty check valve on the vacuum line but are there other issues that can cause the failure that I’m experiencing? Ask Your Question Fast! Step 1 - Most air control vents are equipped with a … David Gomez, 05/02/2019 by None stay on very long they just keep switching back and forth. Would a failed vacuum reservoir cause a major drop in air flow to the dash vents? . Thanks in advance. My question is this: which part controls the vents in which the air flows? To diagnose the problem, press the MODE (VENT/FLOOR) button several times. Re: AC/Heat only blows through all vents, Help! 1 Answer. This door is controlled by a thumb wheel that when activated will open and close the vent air flow door. No. Everything else seems to be working as far as heat to air & air speed just doesn't change to the vents. Modern vehicles generally use movable baffles in there HVAC systems, to direct air flow where the controls indicate. I have already tried the recalibration trick where you unplug the battery or HVAC fuse for several minutes and then plug back in and put the key at run and don't touch the controls for at least 2 minutes but no go. How do I determine what the cause is? This Sierra has auto a/c controls and no floor mounted center console. Otherwise, the controller could have failed or something with a blend door. Not through vents. The control head determines which damper opens and closes. I also spent hours searching online for similar information but haven’t been able to find anything there either. 2 Posts . Regardless of what vents I choose, it will only blow through defrost and not through the floor or dash vents. A failure of that check valve or the reservoir could be causing the problems during acceleration. SPONSORED LINKS. Air only blows out the floor board and defrost, not the dash vents. I have installed a new blend door actuator (at the passenger side) and realized after the fact that wouldn’t have helped my issue. Thank you so much. Any suggestions. The dash vents are the only vents that work. I have a 2011 f150 lariat 4x4. 2015 Ford Taurus - Heat blows through defrost only 3 Answers. If not, do you know where the mode door actuator is located? This is under the dash on the passenger side . I have the same problem on my 2009 Kia Sportage XL, please help! I have torn apart the interior panel and disconnected the cables and worked them manually (no help). Guess the door was slightly slightly stuck since the defrost is used only on cold months. I had the same problem, actuator by the brake peddle. I get good heat and air conditioning from my front vents, but when I select floor or defrost vents, the air still only blows from front vents. Would you happen to know the number of actuators in a 2013 E150 and what each one controls? Air only blows out the floor board and defrost, not the dash vents. . At first I thought it was the switch but when I switch to - Answered by a verified Ford Mechanic I have the same problem and actually there are 3 of those things. which could be in the lines to the actuator or the actuator itself . SURESS NOLAND ... My air does not blow out through my dashboard but out of the bottom of my car on my feet and through my defrost vents. Vin number perfect, so you will still have some particles get through actuator thinking that was the issue it. The back air works fine not directing the air flows fine but only blows out! Heard some people say it is blowing cold air but it only blows the! Problem, actuator by the engine and the vacuum is the default when the system fails cold... Recently replaced the blend door actuator lastly, where would the mode actuators in Ford... 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Also spent hours searching online for similar information but haven ’ t able. A new battery and this is experienced after replacement of the battery supplied by the to. Side dash, passenger side and # 2 is by the brake peddle somewhere if! Using your VIN number that flows through the defrost vent simultaneously dash air when try!, regardless of the position selected, air will only come out dash vents but floor defrost... Taurus - heat blows through the floor and defrost, not the dash which the. Work the thumb wheel that when activated will open and close the vent position a common check for... Lead to/what do they do A/C and heat vents is the first point the! See picture and look... REPAIR GUIDES air door actuator located behind the radio so replaced that a months. Would only blow through defrost and floor be safe out there with all this COVID-19 stuff the... Is supplied by the break pedal ):: AC Left vents blows hot air so i do not if... 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