03 astro van A C only blows out of defrost vent where do you look for vacuum hose?
under the dash on the passenger side
1 person found this useful
What causes the air conditioner and heater to blow only on the windshield and floor with very little coming through the vents on a '97 Astro van?
A small diameter vacuum tube that controls the vents becomesbrittle and breaks. Open the hood and look for a tee connectionbehind a canister on the passenger side. This tube runs over themotor and connects to a port just to the right of the throttlebody. You will need to remove the air intake cover …to get to it.Takes 15 min. to replace. (Only if you do not have AC) The port hasan elbow that you just won't have access to. (GM doesn't want thepublic fixing anything due to union design greed and corporate rollover, and they all wonder why they are history) Much easier thanopening the dog house. Unless you have AC if so, hey change theplugs to 3 point ignition gap plugs and give it a new lease onlife. (MORE)
Why does the heater in the rear of a 96 Chevy Astro van blow cold air and in the front of vehicle blow hot only when the defroster is switched on?
Probably programmer, It needs to be checked out. I had the same problem....the easiest way to know is to safely jack the vehicle up, run it until it's hot then follow the rubber coolant hose from rear heater to the engine. You will likely find it is cold all the way to the front. If you remove the… fan shroud etc you will see a coolant distribution valve ( there are two) plastic and avialbale from GM. They have vacum connections on them. Check to be sure the connections are ok. If so the valve is likely stuck in the closed position prohibiting any coolant flow to the rear heater from the engine cooling system. The valve ( I would replace both while there since they are buggers to get at and change) . jk (MORE)
Answer . \nNear the firewall under the hood, there is a little vacuum hose that has a plastic disk looking thing in the hose. This piece actually has to do with an engine backfiring, but that disk thing is probably cracked from heat and age. Needs to be replaced. If that is okay or you can't fin…d it, Look for a vacuum hose going into the firewall, follow it to the intake and make sure it has vacuum. If it does, then the problem is inside the car, probably has a leaking vacuum line behind head unit or needs a head unit. (MORE)
the problem you are haveing could be a broken actuator oractuator door... mine is in the shop currnetly for the sameproblem. . Under the hood... There is a small "red" vaccuum tube from thefirewall to the bottom of a canister on the passenger side and to a"t-tap" on the block. Mine got melted after… a tune-up and I had tocut a small section out and replace it. A friend of mine had hisdisconnected after servicing at the dealer. Answer . vacuum not reaching vacuum direction selector (you might thinkit is a switch) ( next to your ac on off control)but in actualityit changes the direction that the vacuum flows (draws) if no vacuumreachs selector, vacuum motor will stay in defrost position. Ifound my problem to be vacuum line disconnected under dash. (MORE)
Answer . \nsounds like a vacum leak in the temperature control panel or from the engine to the control panel, the line from the engine to the control panel is black, and gets split at the panel, has the engine been running a little rough or a lack of power, this might explain it
Vacuum lines on caprice the air blows from the defrost and floor but not the vents can anyone answer?
On the back of the intake manifold are some vacuum hoses. Check and be sure all are attached . If they are good the you probably have a blend door problem.
This may be a cause... My wife's 95 contour had to have the vacuum temp settings control unit replace 2 times. If you are constantly changing settings it really blows the valves in the climate control center... Just a thought.
In a 1997 Buick LeSabre the ac blows out the defroster for the first 5 minutes then comes out the vents it could be a vacuum leak where do you look for it?
I just fixed a similar problem on my 95 LeSabre, got info from this website. http://www.imcool.com/articles/aircondition/fix_vacuum_line.htm
Idk know but mine does it when i start off from a red light or stop sign and as soon as i let off the gas or it changes gears (automatic) it comes through the vents like normal.
Why does AC and heater blow air through defrost vents and will not blow air into cabin vents on 2000 Ford E350 van?
Answer . There is a vacuum switch that controls an air gate that diverts the air flow to the proper outlet. Blowing air out the defroster is the default setting of the switch. Most common causes of this problem are vacuum leaks. Check the vacuum hose on the passenger side engine compartment first…. It ususally leaks going through the fire wall. Regardless this problem is most often always the result of a leak somewhere in the vacuum system not the failure of the switch itself.. If it is a diesel check for proper operation of the vacuum pump (MORE)
How do you fix a 1995 Chevy Corsica that will only blow heat out of the vent and not out of the defroster?
Most likely you have a vacume leak under the dash.Check for lines off or broken.They will harden and crack with excessive heat,such as in the engine compartment.
Answer . There are two questions. First, MAX AC makes the air colder, usually by recycling the cooled air already in the vehicle. Normal AC pulls fresh air from outside the vehicle into the interior. \n. \nSecond, if your vehicle has an electronic control for the environmentals, you may have… a bad control module (inside the section where the knobs are mounted) or the vacuum line may be damaged. Check to see if you can control where the air blows from when using other temperature controls. If you have full control except when you use the MAX AC setting it is more likely the electronic control module is bad. (MORE)
How do you locate a vacuum hose that would cause the air to not blow through the vents only the defrost and floor?
Answer . \nthere is a round black canister [softball size]down low behind passenger headlight the hose you want comes out and goes over top of the engine you need to remove inside engine cover to get at it. it will be dry rotted if you can find hose small enough replace it dealer will cost alot…. i did mine works great (MORE)
The first answer is correct and heres where the leak most likely is. Under the hood, against the back firewall close to the middle, you'll see a vacuum tree. Several hoses plug in here. Both the Tempo and Topaz I've had this happen to, occured here. Look for a unplugged hose or a cracked or dry-rott…ed hose and replace as needed. . Answer . Defrost is the AC/heat system's default position. Likely you have lost vacuum to the control head. When there is no vacuum to control the functions then it will default to the defrost vents. (MORE)
Where Can you get a vacuum diagram for a 1997 Jeep Wrangler your AC is only blowing through the defroster vents so you think you have a vacuum leak or a bad actuator?
One could possibly find diagrams for 1997 Jeep Wranglers at a Jeep Wrangler official site or through a manual company. Another good idea would be to just consult a mechanic.
there is no vaccum to your control panel, check from engine area a small little some are gray lines under hood to fire wall check for woren spots or broken lines to fire wall then inside under glove box check if all hoses are good and hooked up not getting vacum to unit or bad control unit take out …of dash and take vacum lines of with car running should have vacum in one line, good luck! Also check under the driver side dash, there is a round valve with a lever for the vents. Check to see if the lever is connected. (MORE)
Answer . Check for vacuum leak--either under dash or in engine compartment. Check for bad vacuum motors under dash. Defrost is the default position for this system. There is a vacuum resovoir located behind your battery , it is for this condition. When you accel your engine doesn't produce v…acuum due to the throttle plate being open so a resovoir is there to hold a vacuum reserve so that when there is low vacuum produced by the engine there will be reserve to hold the vacuum motor applied preventing the air from changing direction in your dash. When there is no vacuum the direction is at the defrost vents if you have a broken hose or no vacuum your ac would blow out the defrost all the time But since it happens when you accel it sounds like your vacuum resovoir is cracked thus not allowing it to hold a vacuum (MORE)
Answer . Thats a vacuum leak.. The vacuum lines (7/32" and 5/64?") dry rot after a few years. There is a "vacuum storage" ball, either on the hood, behind the Driver's side hood hinge or behind the fender, depending on your model. The vacuum for this and the controls comes from a "t" off of the …PCV check valve. Find the ball and check the hoses. (MORE)
Where is the air condition duct for the vents on a 1994 Astro van as air only comes out the defrost?
Answer . \nSounds like a vacuum problem - leak either under hood or under dash -- could ba a bad vacuum motor under dash\n. \nDefrost is the default position for this system
Is there a vacuum that controls which vent the air comes out of the defroster only 96 Sebring convertible?
This happened to my 96 Your battery went dead sometime it messed up the computer.Disconnect the ground for 5 or more min. Reconnect and it should work
Where can you find a vacuum hose diagram for a 2002 f150 54l v8 My AC switchs between vents an defrost vents .I need to check the vacuum hoses but not sure where all are?
It is most likely the EATC module that controls the temperature in the vehicle. About $500 at dealer. I advise you to try and fix this problem your self. I had the same problem and ended up fixing it within 30 minutes and less then $2.00. This may or may not work for you and it will not hurt to chan…ge the parts either way. It seems that the O rings found in the control unit dry out or even crack over time. This is what needs to be replaced to eliminate the vacuum leak. (MORE)
What should you look for when your 2002 Astro blows ac only at the bottom and top vents and not very strong?
Answer . Check for a broken vacuum line. The vacuum line controlling the doors on the heater/AC blower is a small hard plastic line. When it breaks it has little affect on the engine performance but the vents default to defrost for safety reasons. The few I replaced start at the front portion of …TBI base. Your parts person can show you where it is and it isn't expensive. (MORE)
What would cause the windshield defroster in a 2002 KIA Spectra to only blow air from the panel and floor vents instead of the defrost vents?
Underneath the driver side dashboard, near the center console, is a plastic control knob with a metal wire/bar connector that is attached to the main directional control knob (defrost, vent, floor vent select knob) on the center console. The metal wire/bar will sometimes pop off the plastic control …knob, so when you turn the main control you're not actually re-directing the forced air to the selected vents. Re-attached the metal wire/bar to the plastic control knob and should fix the problem. (MORE)
The AC on a 1998 Dodge Ram 1998 will only be blowing out thedefrost vent if the air handler is not set properly. This canresult from a piece of debris getting stuck or a faulty flap.
The baffle that redirects air from one compartment to another is either frozen in that position, or the control for it has a loose or missing connection. In some cars, the baffle is electrically operated, so in that case it could be a bad switch or electric motor.
Check the vaccuum hoses going to your manifold- The one that controls air flow direction to your AC is probably split. Astroman
Cold air from the defrost indicates that the air doors are in thewrong position. The doors are vacuum controlled in most vehicles.check the vacuum system for a leak.
1995 G20 Van - Why will Air Conditioning only blow out of the defrost and lower floor vents and not the dash vents?
Air flow is controlled by plastic doors which are controlled by vacume motors. Could be they're stuck, or a vacume leak.
In the past on my 89 and 99 Astros.. When this happens the small vacuum line that runs from the front of the Driver Side Valve Cover to the HVA System on the Passenger side has been broken.. This line runs across the front of the engine and becomes brittle from the heat and can crack or break in t…wo.. Best results are to replace the vacuum line instead of splicing it. (MORE)
You lost the vacuume supply coming from the engine, defrost is the default mode if a mafunction in the vacuume supply is lost.
The vehicle does not have just one hose. A vacuum leak in any hosecan cause low vacuum and the door will not operate properly. Theleak could be under the dash or under the hood.
The 1984 Buick uses vacuum lines to change air flow from defrosterto ac vents. Check the entire vacuum system for leaks.
Sounds like the BLEND DOOR arm is broken and it's a real pain to get at, dash has to be taken out etc. dealer charges like $2200 to fix and the part is like $6.00 Good luck with that one
Why does a 1996 town and country van blower only blows out through the front vents will not switch to defrost or blow out to floorboard?
had same problem w/ my '96 LXI. Run this diagnostic check, With the engine running, on the climate control panel there are four wiper buttons on the left side. Press and hold the top and bottom buttons at the same time until lights begin to flash. Ventilation system will run through a check of the v…ent system and reset itself. Takes several minutes to run diagnostics and vehicle must be running because it requires vaccumm. (MORE)
your switch is activated by vacume. check all your vacume hoses around your engine to see if they are cracked or disconnected. start with the little black ball under the air filter box, and follow the vacume hoses from there.
Does the heater vents on a 2004 2500 dodge diesel operate on vacuum or electric My truck only blows out of the vents on the dash occationaly it will switch to defrost for me?
The doors are electric. You most likely have a broken door inside the heater box under the dash.
either you have a vacume leak under hood or the diaphragm is blown on vent selector
There are a couple of possibilities. The vent diverters are either physically stuck in the duct work or the diverter motion has been stopped by losing a power source. The diverter is the vane within the duct that changes the location/direction of the fan controlled air movement in the vehicle cockpi…t... whether it's providing heat or air conditioning. The power loss could be the electrical wiring, fusing, motor or the solenoid providing the positioning of the vane. Another possibility is the "defrost" selection or button is always on or enabled. I hope this will help you in determining the problem. WBT (MORE)
you have to by pass the heater core. get a 3/4 heater connection piece just one way trim your hoses down and then plug off your heater coe connections on your fie wall might try to take out fuse for blower motor if that dont work.you have to bypass heater core very simple thing
99 astro van will not blow air out of the vents when switched to dash vent only blows in defrost and floor?
google astrosafari van repair and you will find a lot of info on how to repair/replace your vacuum lines and valves
How did the air stop blowing out the vents in your Bonneville but only blows out the windshield defroster?
you may have whats known as a mode actuator door going bad (the thing that changes direction of the blower motor vent) . there are several parts in that system so to be sure it will have to be disassembled and inspected
you have vacuum line off or stopped up going to heater control. Your post led me right to the problem. broken vacuum line under the hood at the canister. I used a short piece of shrink tubing to repair the line.
When you move the lever on the dashboard control a cable moves the diverter valve to the chosen position. In your car's case it sounds like the cable has either come loose or is broken.
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
The first thing that you need to check will be the vacuum hoses for leaks, breaks or loose fitting ones.....
usually one of two things. 1 the switch control may not be working. 2 under the dash are dampers which control the air flow direction. check to see if the vacuum lines going to the diaphram on the dampers have a vacuum leak, you may hear a hissing sound and possibly the engine running a little rough… also, but not necessarily both. most cars I have worked on with this problem have had just a vacuum leak on one of the lines. try tracing them down from one end to the other. (MORE)
Either you have clogged or busted vent pipe or the actuator could be going bad.
What is wrong with your ac in a jeep Cherokee Laredo when the ac only blows out of the defrost and not the vents?
the mode door inside the hvac unit has most likely broken causing to to default to defrost. sometime the actuator is at fault, wither way the dash has to come out
Loss of vacuum supply to the HVAC controller. The vacuum supply comes from the pass side of the engine and goes through the firewall next to the AC lines. It is a small black line.
Why does your air only blows out the front vents and not the floor are defrost on your 2003 dodge ram?
This is the same on all cars. When the air flow is OFF in a section, the it blows stronger to the other vents. In this case the ones for the windshield. This makes defrosting quicker so you can start driving safely sooner.