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Why won't the dash vents work on my 99 Subaru but floor vents and defrost vents work fine?
Wiki User
∙ 17y ago
most of these door systems are vacuum controlled...but a pencil or object stuck internally can also be the cause, and not often easy to fix...for the vacuum system you can find specs and routing at the local library... check all the vacuum lines on the engine, and listen for vacuum hissing under the dash...good luck..:)
Wiki User
∙ 17y ago
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Why do you get hot air at floor and defroster vents but only cold air at the dash vents vents in a 1995 chevyvan 20?
the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater
Why won't the dash vents work in my 95 Chevy Camaro but floor vent and defrost vent work fine?
the ducts can not be hooked up for the vents to work
Why won't the dash vents work on my 1995 Chevy Camaro but floor vents and defrost vent work fine?
When there is a problem with the vent system it dfaults to the defrost setting. Sounds like you have a problem in the doors that direct the air flow.
Why does a 2003 Crown Vic with auto temp control blow heat and ac from the defrost and floor vents but no air through the dash vents?
Because the air selector died.
What is a vacuum actuator under dash Defros?
Acutator is a small vacuum powered motor used to open and close diverter to direct air either to defrost, floor, or vents
Why would the air conditioning only blow air from the defrost and floor vents and not the dash vents on a 1996 jimmy?
This is a very common problem and you need to check for a vacuum leak, broken vacuum line or a loose vacuum line......
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.
Air not blowing through vents just floor and defrost on a 2002 jeep?
when it happened to mine, it was because the arm behind the dash that controls the internal vent doors slipped off
The heat air and defrost do not work What is wrong?
The year, make and model info would help. Also need to know if the blower motor is working, just not getting any heat, or not changing function between defrost, dash or floor vents.
Why does your 2004 marquis air blows through defrost and floor vents and not through vents?
Grand Marquis are designed and wired so that the VAC door fails and will even cause engine not to start due to wires be connected together under dash.
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.
Why is there no air coming out of vents can hear air blowing under dash board?
The year, make and model would help but many vehicles use vacuum to operate the direction of air flow through the floor vents, dash vents and defrost vents. If the vacuum supply is cut off for whatever reason the system defaults to defrost only. So if you only have the defrost mode working chances are the vacuum supply is cut off. Check the HVAC vacuum supply line under the hood for damage. If that system seems to be working but you have insufficient air flow through all of the vents, check/replace the cabin filter if applicable.
