post #2 of 7 Old 06-16 … It is a very good place to hook up a vacuum pump and see if it holds vacuum. Why does my A/C blower switch from vent to defrost when I accelerate? Remove Advertisements. The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. Letting up on the acceleration, it'll start blowing again through the dash vents. Adding An RV Dishwasher: Here's How I Solved My Sp... Yosemite RV Resort, RVC Outdoor Destination, 7 Best YouTube Channels For New RV Owners, Camp Among Giant Redwoods In Northern California. View 5 Replies Ford Super Duty (1999-2016) :: 2001 - Vents Stuck On Defrost. My 2005 F-250 6.0 liter Diesel FX4 Lariat is blowing AC through defrost only all the time. Is this a DIY fix or better left to the pros? Print this page; Share this page × Ad. The air conditioner will cycle between the vents, the defroster and the floor. Other than that it works great and is ice cold. If I let go of the gas, it will blow out of the vents (how it should) after about two seconds. 1 Answer. Sponsored Links JeepForum.com. I had the same problem with my 85 Grand Marquis. 5 Related Answers Anonymous . 1 - 18 of 18 Posts ... it blows cold air just fine but when i accelerate it starts blowing air out the defrost vents only....and that is just wizzing me off.! If I baby the throttle then it doesn't happen as much, but again, if it does happen, I take my foot off the peddle and two seconds later all is well. Posted by Rick Stevens on May 06, 2018. Is it only the temperature of the air that changes with accelerating/coasting ? You most likely have a broken plastic 1/8" line under the hood near the RH side of the engine that supplies the vacuum to the HVAC controls. Posted by jhngfrth on Aug 28, 2011. Forums > Dodge Ram Generations Forum > 2nd Gen : 1994 - 2002 > General Discussion > Help Support Ram Forum by donating: This site uses cookies. A lot of vehicles will have a vacuum accumulator tank somewhere. When I go downhill or decelerate the air returns to the vents. 2001 ford f150 vent air goes to defrost when accelerating - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. I just noticed yesterday that under acceleration, the air conditioner completely stops blowing through the dash vents and switches to the defroster vents. AC blowing out the defrost vents!!! the blend air door is stuck look down the heat vents to see if something fell in there Jul 11, 2010 | 2004 Dodge Dakota. I have a 1989 Mustang LX notchback 5.0 with an air conditioning problem. Why does my 92 Ford Chateau club wagon AC blows through the defroster vents? Jump to Latest Follow Status Not open for further replies. The accumulator ball on my 97 is located down behind the passenger side headlight, and I finally fixed my vaccum issues, turned out to be the 2 check valves, replaced them and it fixed all my problems, learned that fix from the dodge/mopar help site, very cheap and easy fix, hope this helps,,,,. When I step on the gas it blows through the defrost vents. On my 1999 Dodge Ram, when accelerating with the A/C on, the air stops coming out the vent and comes out the defrost. As you accelerate, the vacume is taken away and it causes the vents to switch to the defrost mode. Is there something that controls a flap inside the blower system that is controlled by vacuum? I decided to live with it. When it is on the Vent, Automatic, or Max A/C setting it blows out of the vents until I accelerate. I have a 2006 6.0l f350 crew cab that blows air hard every time I accelerate. What to I need to start to look at?? I have seen a write up for this fix somewhere but cant find it. Or a problem. Stratis. boosted3 Senior Member. After awhile it "switched" and started coming out of the dash vents. a/c blows from defrost vent when accelerating. Thanks 2001 JGC 4.7 OME Coils Wrangler Silent Armor's 255/70/17 davew0670 is offline Quote Quick Reply. Sponsored Links JeepForum.com. My car has an automatic transmission. Inside your vehicle’s vent system, there are small doors that open and close to change the flow of air running through the system. Will sometimes tee off and also supply vacuum for cruise. Think it's a vacuum prob, but not sure where to start! I created this video with the YouTube Video Editor (http://www.youtube.com/editor) This happens when both A/C or non-A/C vent is on. Anyone ever have this problem? It sometimes blows regularly when I have the AC on low. CSA. Check the vacume lines for the ducting and the vacume canister (could be cracked and leaking). Ac blows through defrost when accelerating Ac blows through defrost when accelerating SPONSORED LINKS. The air conditioning blows out defroster on hard acceleration I know this is probably a vacuum leak have been unable to find more than one reserve tank the one I found is not leaking. This system will have a vacuum line coming off the intake going towards the firewall and thru to the control panel with a vacuum reservoir connected inline. Seen it plenty of times. Hyundai Master Technician. Have fun finding the broken line!!!! I have a 2004 ford explorer v8 4wd eddie bauer 4x4. I am an AC and refrigeration technician. Dodge. Any help will be greatly appreciated. Ac blows through defrost when accelerating Ac blows through defrost when accelerating 3 Dangers Of RVing With Dogs That Are Totally Prev... 21 RV Parks And Campgrounds To Visit In 2021, http://cdn.johnywheels.com/2015/12/0...facaf967a.jpeg. 3 Answers. 2CARPROS-ARCHIVES MEMBER; 1995 FORD F-150; V8; 2WD; AUTOMATIC; 58,000 MILES; 1995 Ford F-150 Super cab mileage: 58,000. It will also allow you to check for leaks without the engine running. Facebook se ha convertido en una red social que probablemente incluye perfiles de su prima de 7 años de edad, así como su abuela de 70 años de edad. It started to do this ever since I got the intake manifold replaced.I have got it checked by a trusted mechanic and he said the lines are good. Thanks! The system blows cold air when it comes out of the vents. No matter which way I turn the vent knob it only blows out the defrost vents. The following errors occurred with your submission, A/C blows from dash to defrost when accelerating, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. a/c blows from defrost vent when accelerating. If cruise is on and ac is on any setting, and the engine is working hard, the ac blows only out the defrost. I got in this morning to leave the house and the air was only coming out of the defrost vents. Any reason why air only blows out the defrost vents? Sounds more like a vacume problem to me. I noticed today that whenever traveling and accelerating like going uphill for an extra length that my a/c will quit blowing and as soon as I level off or the need to accelerate levels off it will resume blowing. AC is not working Inspection: $96.46 - $106.46: Get a Quote: Robert Tomashek. My car has 197000 miles. It sometimes then sta … read more. Also seen the vacume switching valve in the dash go bad as well. What you say is true but it will not cause the air to blow out the defrost. I looked under the hood for the vacuum leak and didn't see anything wit the naked eye. It blows real hard for a minute and goes away if I accelerate through … Thank-you. I have a 2001 Dodge Ram 1500 with the V6. I'm guessing that there is a default in the program that controls the HVAC. Rinse and repeat. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. blows out vent even if changed to defrost but change somtimes. 1 Answer 2004 ram only blows air out vents and not defrost. Cables need adjusted or lubed?? It seems the fan is blowing but it is like something blocks the air passages when accelerating. The cold air blows out of the defrost and floor vents all of the time. 1995 Ford F-150 AC blows out the defroster when accelerating hard. Clicking this will make more experts see the question and we will remind you when it gets answered. July 6, 2016, 1:59am #8. 405 Answers ; SOURCE: 2004 Pontiac Montana blows cold air in defrost. Thanks. Senior Master Ford Tech. 2003 Crown Victoria: only blows..the defroster..vents..air comes. When I accelerate my AC from the vents changes to the defrost. I have seen a write up for this fix somewhere but cant find it. Advertising - Wanted to see if anyone might know why my AC cuts out when i accelerate usually above 2000 RPM, then when i let of the gas when im up to speed the AC... Log in or Sign up. US State License Plate Mottos Quiz: Where Are We? As it stopped, i heard the compressor kick into overdrive (like it does when it is cooling the air before blowing it through the vents right as you turn it on.) By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Comment; Flag; More. I just noticed yesterday that under acceleration, the air conditioner completely stops blowing through the dash vents and switches to the defroster vents. Is this normal? When this happens it is usually a vacuum leak. A quick search gave this for a 1998 Dodge, and does show a cannister. Very consistent, no matter what mode I set the air to (heater, vent, etc,). A/C blows from dash to defrost when accelerating. thru the defrost and when you let off the accelerator the the air starts blowing thru the front vents like it should. Cookie Policy - There is also a revised vacuum check valve available to address this concern. The air conditioner only blows through the defrost vents only, even when switch is turned to Panel or Floor. Posts: 5,464 Likes Received: 6,508 Joined: Mar 20, 2016 Ram Year: 2015 … RE: AC/heater only blows out defrost vents IP: Logged Message: If this helps, I also have a 97 cc v6 with similar problem. Why it's doing this. However, I am not familiar with vehicle AC. Sounds more like a vacume problem to me. Recommended Services. These doors are operated by small actuator motors that are activated when you turn the knob or switch to make a change to the vents. 1 Answer . you have to attach a check valve in the system. Everything is smooth with no binding. When accelerating... Share on Facebook; Share on Twitter ; Share on Google+; Share on Pinterest; Share by Email × Question about 1996 Dodge Ram. 06-15-2005, 07:24 PM . 'More than any other time in history, mankind faces a crossroads. Wanted to see if anyone might know why my AC cuts out when i accelerate usually above 2000 RPM, then when i let of the gas when im up to speed the AC kicks in. It is not model specific. You will usually find the problem under the hood in these lines. On my 1999 Dodge Ram, when accelerating with the A/C on, the air stops coming out the vent and comes out the defrost. When I lift off the gas, it comes out the vents again. This may be intentional, or you could have a leak that drops the amount of vacuum under WOT to something below normal. What you say is true but it will not cause the air to blow out the defrost. The AC on a 1998 Dodge Ram 1998 will only be blowing out the defrost vent if the air handler is not set properly. It was blowing out of the defrost vent and the floor??? This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. This system will have a vacuum line coming off the intake going towards the firewall and thru to the control panel with a vacuum reservoir connected inline. Protect Your RV Battery In Winter Storage. Please explain. Privacy Statement - There is also a revised vacuum check valve available to address this concern. Terms of Service - This can result from a piece of debris getting stuck or a faulty flap. Jul 16, 2011 #2 I believe these cars are notorious for this. I tried playing with the controls to get it to switch but couldn't. But cant find it change somtimes it 'll start blowing again through the dash and! The question and we will remind you when it comes out of dash. Go bad as well without the engine running this will make more see. 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