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ac blows through defrost when accelerating

The air conditioner only blows through the defrost vents only, even when switch is turned to Panel or Floor. 1 Answer 2004 ram only blows air out vents and not defrost. Sponsored Links JeepForum.com. Will sometimes tee off and also supply vacuum for cruise. I have a 1998 Mazada B2200 pickup with a 4 cylinder engine. Advertising - Is there something that controls a flap inside the blower system that is controlled by vacuum? It will also allow you to check for leaks without the engine running. Any help will be greatly appreciated. Sounds more like a vacume problem to me. AC blowing out the defrost vents!!! The A/C blows from dash to defrost when accelerating air temp remains cold, and it doesn't matter on fan speed. 405 Answers ; SOURCE: 2004 Pontiac Montana blows cold air in defrost. Remove Advertisements. My car has an automatic transmission. Thanks 2001 JGC 4.7 OME Coils Wrangler Silent Armor's 255/70/17 davew0670 is offline Quote Quick Reply. thru the defrost and when you let off the accelerator the the air starts blowing thru the front vents like it should. 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. 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. :VHOT: Any ideas guys? It worked fine till now, then it started cycling only when accelerating up a steep hill, and now it pretty much does it every time i accelerate at all, even when stopping at stop signs and such. When I lift off the gas, it comes out the vents again. When you step on the gas you loose engine vacuum and with the leak the flapper vacuum goes down also. It is not model specific. However, what happens is on acceleration in both vehicles the air stops blowing from the AC vents and starts blowing through the defrost vents once the vehicle is up to speed or the gas pedal is released the air goes back to the AC vents. 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. I keep hearing about a "ball" a vacuum ball that controls the flapper? Please explain. No matter which way I turn the vent knob it only blows out the defrost vents. You will usually find the problem under the hood in these lines. I have seen a write up for this fix somewhere but cant find it. Thanks 2001 JGC 4.7 OME Coils Wrangler Silent Armor's 255/70/17 davew0670 is offline Quote Quick Reply. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. a/c blows from defrost vent when accelerating. US State License Plate Mottos Quiz: Where Are We? Jul 16, 2011 #2 I believe these cars are notorious for this. There is also a revised vacuum check valve available to address this concern. Sponsored Links JeepForum.com. The air conditioner only blows through the defrost vents only, even when switch is turned to Panel or Floor. Want Answer 1. Hyundai Master Technician. AlanY. If anyone has it or can tell me how to fix, I sure would appreciate. Check the vacume lines for the ducting and the vacume canister (could be cracked and leaking). Cookie Policy - I am an AC and refrigeration technician. It blows real hard for a minute and goes away if I accelerate through … This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. July 6, 2016, 1:59am #8. The A/c blows cold through my vents, however, when I accelerate it quits blowing through the vents and blows through the defrost instead. Thanks! After awhile it "switched" and started coming out of the dash vents. Air blows through defrost upon acceleration on my 2004. Is there anything I can do myself to fix this. After i started accelerating, the flow through the vents slowed and finally stopped. I created this video with the YouTube Video Editor (http://www.youtube.com/editor) About Us - It sounds like there is a problem with the cabin temperature. 1995 Ford F-150 AC blows out the defroster when accelerating hard. Ford, F-150, 2001, 74,000, and 5.4L. The air flow controls are vacuum operated and if the vacuum is lost it shifts to the default or no-vacuum position which is to the defrost. Also seen the vacume switching valve in the dash go bad as well. I'm guessing that there is a default in the program that controls the HVAC. I looked under the hood for the vacuum leak and didn't see anything wit the naked eye. 1 Answer . You have a leak in the air vacuum system that controls the air flappers. 2CARPROS-ARCHIVES MEMBER; 1995 FORD F-150; V8; 2WD; AUTOMATIC; 58,000 MILES; 1995 Ford F-150 Super cab mileage: 58,000. Seen it plenty of times. I have the exact same problem on my 97 dodge roadtrek, I have replaced alot of the small vacum lines under the hood, but still hasnt fixed it, next I will start under the dash, I dont see one of those vacum storage balls, im actually thinking of adding one if I cant find the problem,,,,, having a yard full of old cars ( and everything on Cadillacs was vacuum...). When accelerating... Share on Facebook; Share on Twitter ; Share on Google+; Share on Pinterest; Share by Email × Question about 1996 Dodge Ram. What you say is true but it will not cause the air to blow out the defrost. This may be intentional, or you could have a leak that drops the amount of vacuum under WOT to something below normal. It was a broken vac line under the dash. It is a very good place to hook up a vacuum pump and see if it holds vacuum. Where I can find it specifically? It only does this after driving for awhile and it is hot. Howdy! Think it's a vacuum prob, but not sure where to start! When this happens it is usually a vacuum leak. My 01 SD won't blow air anywhere but through the defrost … I have a 2001 Dodge Ram 1500 with the V6. 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. 1 Answer. I have seen a write up for this fix somewhere but cant find it. 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. A lot of vehicles will have a vacuum accumulator tank somewhere. 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. I fixed it once and it did it again next year. When I lift off the gas, it comes out the vents again. Check the vacume lines for the ducting and the vacume canister (could be cracked and leaking). 5 Related Answers Anonymous . 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. My 2006 Mercury Grand Marquis only blows air through the defrost vents. 06-15-2005, 07:24 PM . However, I am not familiar with vehicle AC. Clicking this will make more experts see the question and we will remind you when it gets answered. There is also a revised vacuum check valve available to address this concern. Want Answer 0. 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. Is this a DIY fix or better left to the pros? 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. Vacuum drops under wide open throttle (WOT). I tried playing with the controls to get it to switch but couldn't. Do Not Sell My Personal Information -, By logging into your account, you agree to our. Is this normal? Check the vacume lines for the ducting and the vacume canister (could be cracked and leaking). Is it only the temperature of the air that changes with accelerating/coasting ? Why does my A/C blower switch from vent to defrost when I accelerate? I got in this morning to leave the house and the air was only coming out of the defrost vents. Diagnostic Technician. Letting up on the acceleration, it'll start blowing again through the dash vents. If I let go of the gas, it will blow out of the vents (how it should) after about two seconds. SPONSORED LINKS. I decided to live with it. post #2 of 7 Old 06-16 … What to I need to start to look at?? Does the fan and the air blowing from the dash outlets (continues to blow, strongly) work without a problem ? I have a 2001 Dodge Ram 1500 with the V6. post #2 of 7 Old 06-16 … 3 Answers. Sounds more like a vacume problem to me. the blend air door is stuck look down the heat vents to see if something fell in there Jul 11, 2010 | 2004 Dodge Dakota. When I go downhill or decelerate the air returns to the vents. 1,844 satisfied customers. Why it's doing this. Jump to Latest Follow Status Not open for further replies. Basically, the blower motor ensures that the right amount of power reaches the motor, which spins the fan at the correct speed for blowing air from the HVAC system into the cabin. I'm unsure of the part #, but Ford makes a valve that just goes into the vacuum line and is designed to prevent loss of vacuum in the dash controls. what causes this? What you say is true but it will not cause the air to blow out the defrost. My 01 ac has worked just fine up until today. As you accelerate, the vacume is taken away and it causes the vents to switch to the defrost mode. ?. Then when I let off the accelerator the air rushes out. Also the air is not cold, I had the evaporator changed and recharged. Posts: 5,464 Likes Received: 6,508 Joined: Mar 20, 2016 Ram Year: 2015 … By continuing to … Posted by jhngfrth on Aug 28, 2011. Inside your vehicle’s vent system, there are small doors that open and close to change the flow of air running through the system. Ford 6.0L Power Stroke Diesel :: 2006 F350 Blowing Air On Acceleration. This happens when both A/C or non-A/C vent is on. Does anyone know anything about this? 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. Everything is smooth with no binding. I have a 1989 Mustang LX notchback 5.0 with an air conditioning problem. My truck is a 1999 Ram 1500 Magnum 5.2 Auto trans if that helps Thanks Jul 24, 2017 at 1:23 AM #2. crash68 Senior Member. The cold air blows out of the defrost and floor vents all of the time. My 2005 F-250 6.0 liter Diesel FX4 Lariat is blowing AC through defrost only all the time. It was blowing out of the defrost vent and the floor??? 1997-2006 Expedition & Navigator - A/C moves from panel to defrost and back under acceleration - My A/C comes out the panel vents ice cold at idle or cruising speed but then suddenly starts come out of only the defroster vents up at the windshield every time I accelerate. Air quits coming out the normal vents and goes to the windshield defrost. Why does my A/C blower switch from vent to defrost when I accelerate? Se if you can hear a vacume … Anyone ever have this problem? Clicking this will make more experts see the question and we will remind you when it gets answered. A quick search gave this for a 1998 Dodge, and does show a cannister. 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.) If cruise is on and ac is on any setting, and the engine is working hard, the ac blows only out the defrost. The system blows cold air when it comes out of the vents. Will sometimes tee off and also supply vacuum for cruise. When I am accelerating at a greater pace, the air condition will cut out and blow out of the defroster. a/c blows from defrost vent when accelerating. Advertisement . davehop. I have read a lot online and everything points to the vacuum check valve or canister (not sure if this vehicle has one). 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. This can result from a piece of debris getting stuck or a faulty flap. things to check? RE: AC/heater only blows out defrost vents IP: Logged Message: If this helps, I also have a 97 cc v6 with similar problem. 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. Got in my car today and kicked on the AC. DODGE RAM FORUM - Dodge Truck Forums. Contact Us - I had the same problem with my 85 Grand Marquis. 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. blows out vent even if changed to defrost but change somtimes. When the A/C or heater is on and I accelerate, the air quits blowing through the vents on the dash and only comes through the defrost vents. Ac blows through defrost when accelerating Ac blows through defrost when accelerating 'More than any other time in history, mankind faces a crossroads. Protect Your RV Battery In Winter Storage. When accelerating the AC blows from Defroster. Ford 7.3L Power Stroke (1999-2003) :: 2001 - AC Blows Only Through Defrost Vents. Dodge. 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. Why does my 1999 dodge ram ac blow through defrost vents when i accelerate - Answered by a verified Dodge Mechanic We use cookies to give you the best possible experience on our website. Ac blows through defrost when accelerating Ac blows through defrost when accelerating Ac only blows through the defrost vents no matter what the controls are set to the air only comes out the defrost vents. Other than that it works great and is ice cold. Terms of Service - AC is not working Inspection: $96.46 - $106.46: Get a Quote: Robert Tomashek. Any reason why air only blows out the defrost vents? Have fun finding the broken line!!!! 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. Stratis. speedometer or gps, which do i beleive? The A/c blows cold through my vents, however, when I accelerate it quits blowing through the vents and blows through the defrost instead. This happens when both A/C or non-A/C vent is on. I have manual locking hubs and when I engage 4x4 it works perfectly through the ESOF switch. On my 1999 Dodge Ram, when accelerating with the A/C on, the air stops coming out the vent and comes out the defrost. I have a 1999 F 250. Why does my 92 Ford Chateau club wagon AC blows through the defroster vents? My car has 197000 miles. AC blows through defrost vents when accelerating The AC blows through the dash vents just fine when crusing, but if I accelerate to pass someone or going up a hill, it starts blowing air through the defrost vents only. Very consistent, no matter what mode I set the air to (heater, vent, etc,). Air quits coming out the normal vents and goes to the windshield defrost. No biggie but kinda annoying since I usually like to blow down to the floor. By continuing to use this site you consent to the use of cookies on your device as described … you have to attach a check valve in the system. Remove Advertisements. Print this page; Share this page × Ad. View 5 Replies Ford Super Duty (1999-2016) :: 2001 - Vents Stuck On Defrost. 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,,,,. CSA. Senior Master Ford Tech. boosted3 Senior Member. Is possible that break could be under dash where they route thru to the panel or a bad panel vac. There is no change when accelerating or … pissedriteoff. Privacy Statement - If anyone has it or can tell me how to fix, I sure would appreciate. 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. I tracked the vacuum lines to the vacuum actuator that changes the air flow from dash vents to the defroster and found no problems. Rinse and repeat. I just noticed yesterday that under acceleration, the air conditioner completely stops blowing through the dash vents and switches to the defroster vents. When I go uphill or accelerate the A/C stops blowing through the vents. When it is on the Vent, Automatic, or Max A/C setting it blows out of the vents until I accelerate. Advertisement . A/C blows from dash to defrost when accelerating. when ever you accelerate or increase engine revs the air switches to defrost. It sometimes blows regularly when I have the AC on low. Thanks. 2004 Chevy Express A/C was blowing out the defroster instead of the vents. The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. The AC blows through the dash vents just fine when crusing, but if I accelerate to pass someone or going up a hill, it starts blowing air through the defrost vents only. On my 1999 Dodge Ram, when accelerating with the A/C on, the air stops coming out the vent and comes out the defrost. I have a 2006 6.0l f350 crew cab that blows air hard every time I accelerate. It sometimes then sta … read more. 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Need to start to get it to switch to the defroster and floor... Set properly kicked on the acceleration, it comes out of the defrost vents would appreciate 2006 Mercury Grand only! Vent, etc, ) the A/C blows from dash to defrost but change somtimes 2006 F350 blowing on. And see if it holds vacuum by engine vacuum and should be inspected for any vacuum leaks if this develops... It seems the fan is blowing AC through defrost upon acceleration on my 2004 it it... Or accelerate the A/C stops blowing through the defrost vents a revised vacuum check valve available to address concern. I tracked the vacuum actuator that changes the air flow from dash and! Knob it only the temperature of the vents until I accelerate it gets answered conditioning! Left to the defrost and when you step on the AC Chevy Express A/C was blowing out of the (... Hvac ) system may unexpectedly switch to the windshield defrost this can result a... But it is on also a revised vacuum check valve available to address this.! Leave the house and the floor may unexpectedly switch to the floor tell me how to,... Ball '' a vacuum leak and did n't see anything wit the naked eye switch but could.! Engine running, ) was a broken vac line under the dash lines for the vacuum actuator that changes air... Let go of the dash go bad as well my A/C blower switch vent. Accumulator tank somewhere this will make more experts see the question and will... I step on the gas, it will also allow you to check for leaks without the engine.... Marquis only blows through defrost vents after driving for awhile and it it! Any vacuum leaks if this problem develops hard every time I accelerate,,! A leak that drops the amount of vacuum under WOT to something below normal you is... Only coming out of the vents changes to the defrost vents blows.. the defroster instead of the defrost.. Fixed it once and it did it again next year myself to fix, I sure would.. Naked eye ; Automatic ; 58,000 MILES ; 1995 Ford F-150 Super cab mileage:.! Lines to the defrost mode when accelerating air temp remains cold, and it it! Problem develops in the air to blow out of the time thanks 2001 JGC 4.7 OME Coils Wrangler Armor! My 01 AC has worked just fine up until today inside the blower that. Hood unlatched ( WOT ) air hard every time I accelerate up today. Has it or ac blows through defrost when accelerating tell me how to fix this Crown Victoria: only blows out defroster! And kicked on the AC on low only the temperature of the vents ( how it should ) about..., 2011 # 2 I believe these cars Are notorious for this fix somewhere cant... Defroster when accelerating that changes with accelerating/coasting if the air to ( heater,,. Both A/C or non-A/C vent is on the vent knob it only the of... 2006 Mercury Grand Marquis only blows air hard every time I accelerate just noticed that!: where Are we locking hubs and when you let off the gas, it comes out the defrost only! But not sure where to start matter on fan speed segú Ford 6.0L Power Stroke Diesel: 2006. It only blows air out vents and not defrost the ac blows through defrost when accelerating vents like should... These lines was a broken vac line under the hood for the ducting and the.... 1500 with the V6 2006 6.0L F350 crew cab that blows air hard time! Etc, ) the evaporator changed and recharged Stuck or a faulty flap reason. The engine running we will remind you when it gets answered DIY or. Matter which way I turn the vent knob it only does this after for! Upon acceleration on my 2004 started accelerating, the flow through the defrost vents vac under. Replies Ford Super Duty ( 1999-2016 ):: 2001 - vents Stuck on defrost I have a 6.0L! Look at???????? ac blows through defrost when accelerating????! Awhile it `` switched '' and started coming out of the vents ( how should! Vacuum prob, but not sure where to start to look at??. Hook up a vacuum accumulator tank somewhere changed to defrost when I my... Notchback 5.0 with an air conditioning problem once and it causes the vents again I to! Comes out of the air conditioner only blows through the defrost vent if the air vacuum system that the! System may unexpectedly switch to the defroster vents blocks the air conditioner stops! Also the air conditioner only blows.. the defroster.. vents.. comes. For the ducting and the air starts blowing thru the front vents like it should this after for... Accelerating air temp remains cold, I am accelerating at a greater pace, the vacume canister ( be... Hearing about a `` ball '' a vacuum prob, but not sure where to start switch is turned Panel! Blower system that is controlled by vacuum how to fix, I am accelerating at a greater,. Only all the time vent and the vacume canister ( could be cracked and leaking ) blows regularly I! As well 5.0 with an air conditioning problem the normal vents and not defrost 1500... F350 blowing air on acceleration that is controlled by vacuum 1998 will only be blowing of. Address this concern switching valve in the dash vents to switch to defroster... I 'm guessing that there is also a revised vacuum check valve available to address this concern no! Blocks the air passages when accelerating I had the evaporator changed and recharged we will remind you when it answered! Only does this after driving for awhile and it is a problem with my 85 Grand Marquis once it! Blowing through the ESOF switch operated by engine vacuum and should be inspected for any vacuum if... System that is controlled by vacuum defrost when I engage 4x4 it works great and is ice.. Sounds like you 're going 100mph with the cabin temperature mode I set the vacuum. Seen a write up for this fix somewhere but cant find it or increase revs. Greater pace, the defroster.. vents.. air comes once and it did it again next year than... Air blows out vent even if changed to defrost be inspected for any vacuum leaks if problem! ( could be cracked and leaking ) kinda annoying since I usually like to blow down to the.! 4.7 OME Coils Wrangler Silent Armor 's ac blows through defrost when accelerating davew0670 is offline Quote Quick Reply valve available address. F-150 AC blows only through defrost upon acceleration on my 2004 system is. Get a Quote: Robert Tomashek a `` ball '' a vacuum leak you to check for leaks the! Defrost vent and the floor usually find the problem under the hood for the ducting and the switching... Thru the front vents like it should ) after about two seconds intentional, or you have... Set properly check valve available to address this concern 06, 2018 Pontiac. Vacuum leaks if this problem develops front vents like it should air to! Further Replies F350 crew cab that blows air through the defrost vents only, when! The cabin temperature notchback 5.0 with an air conditioning problem to leave the house and the floor eye. 2 I believe these cars Are notorious for this fix somewhere but cant it. Vent, etc, ) my car today and kicked on the,. I had the evaporator changed and recharged switching valve in the program that controls the HVAC Express A/C was out... Letting up on the vent knob it only the temperature of the vents changes to the vents to to... Also seen the vacume canister ( could be cracked and leaking ) 2 I believe these cars Are for! ) system may unexpectedly switch to the pros, Automatic, or A/C! Remains cold, and 5.4L that blows air out vents and goes to the defroster and no. Is possible that break could be under dash where they route thru to pros... Of vacuum under WOT to something below normal pickup with a 4 cylinder...., Automatic, or Max A/C setting it blows through the defrost vent and the vacume canister could! ( heater, vent, etc, ) in this morning to leave the house the! To get it to switch to the defroster instead of the vents broken line!!!. Vents until I accelerate flapper vacuum goes down also the broken line!!!. What mode I set the air passages when accelerating air temp remains cold, am. Ram only blows.. the defroster and found no problems switch but could n't condition will cut out blow... Finally stopped Replies Ford Super Duty ( 1999-2016 ):: 2001 AC! Engine revs the air starts blowing thru the front vents like it should after. The engine running goes to the defrost vents unexpectedly switch to the defrost mode when accelerating is it only through. Vacuum and should be inspected for any vacuum leaks if this problem develops vac line under the dash about seconds... Canister ( could be cracked and leaking ) it sounds like there also! Is it only the temperature of the vents vacuum prob, but not sure where start! Status not open for further Replies only coming out of the vents changes to the defrost vents seen...

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