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03 astro van A C only blows out of defrost vent where do you look for vacuum hose?
Wiki User
∙ 14y ago
under the dash on the passenger side
Wiki User
∙ 14y ago
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Why heat blows out vents only not defrost or floor?
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
Why does 1994 astro van Air conditioning blows through defroster vent?
small vacuum hose in engine compartment is cracked
Heater and ac only blows on defrost?
Many cars use engine vacuum to operate HVAC controls. If vacuum is cut off the system defaults to the defrost mode. Check the HVAC vacuum supply hose under the hood leading from the engine. It may be disconnected or damaged.
Why will air only blow out the defrost on S10 blazer?
You have a vacuum hose disconnected or broken. Check under the hood for a small vacuum hose out of place or broken.
Why would the ac on a 2000 Chevrolet Malibu to blow on your feet no matter how you set the controls except for defrost then it blows on the windshield?
You most likely have a bad vacuum hose in the engine compartment or a bad control switch.
What is wrong when the air conditioner on a 1989 Oldsmobile 98 regency blows out the top and not through the vents?
Could be a vacuum problem--either broken or disconnected hose or bad vacuum motor under dash or coming in through firewall Defrost is the default position for this system
Why doesn't your heater switch from defrost to heat on a 97 wrangler?
you probabally have a vacuum hose disconnected
Why would the ac on a 2000 Malibu always blow on your feet no matter how you set it except for defrost then it blows on the windshield?
Either you have a defective selector switch or the most likely is that you have a broken,cracked,or loose vacuum hose at the rear of the engine.
Why do panel vents do not blow out air when you hit the AC button or panel vent button it blows out the windshield defrost vents 1989 Topaz?
most vehicles use a vacuum diaphragm to move the mode door inside the dash from the floor to the vents to the windshield. Either the vacuum diaphragm is leaking or the vacuum hose has become disconnected. In my 85 topaz the door pannel vents are used to defrost the side windows.
Where is the vacuum hose in a 92 dodge grand caravan..only the defrost outlet is working?
The vehicle does not have just one hose. A vacuum leak in any hose can cause low vacuum and the door will not operate properly. The leak could be under the dash or under the hood.
2002 ford expedition max ac only blows out thru defrost vents?
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 vacuum 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
Why does heater go to defrost by it self and back to the floor?
My guess is that you have a vacuum supply problem. Most HVAC systems operate off of a vacuum and if the vacuum supply is cut off the system goes to defrost by default, your most important function. Check under the hood for a cracked or pinched vacuum hose.
