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Why would the air conditioning only blow air from the defrost and floor vents and not the dash vents?
Wiki User
∙ 15y ago
I would think that is a vacuum or a linkage problem with the heater control assembly (where all the buttons/slides are for changing between floor/defrost/vent) Had a diaphragm go bad on one once, and in a jeep cherokee, a slight collision with a guard rail knocked a vac line off for the vent controls, and ac only worked from defroster.
Wiki User
∙ 15y ago
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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......
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 would you get heat out of your defrosters but not your front vents or the floor on a 98 wrangler. fuses are good and I replaced the control pannel?
Your blend door is giving you trouble, it is not switching from defrost to heat or vent
Why would the ac change from dash vents to the defrost vents when accelerating?
Because you have a vacuum leak in the system or your vacuum canister is leaking. When you accelerate the vacuum from the engine will drop. That will cause your system to loose vacuum and the floor/defrost door will go to its neutral position. To keep the vacuum up you have a canister that will hold vacuum. It must be air tight.
Why would the AC in an 1997 Oldsmobile Regency only blow air out of the floor and defrost vents?
on my 1992 road touring itdid the same thing and it was the computer but it only cost 102.00 from gm
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.
Why does AC and heater blow air through defrost vents and will not blow air?
depending on what year and make it is, the most likely issue is that you have a valve that moves to divert air to the upper vents, floor vents, and defrost vents and it is either stuck in the defrost position, is broken, or a cable/connector has come loose. The valve is usually in the center of your dashboard up against the firewall. The air flow direction in many vehicles is operated by vacuum controlled servos. If the vacuum supply is cut off, the system reverts to it's default position which is the defrost mode. My guess would be that the HVAC vacuum supply line under the hood is disconnected, pinched or collapsed.
What would cause my air conditioning on my 2003 F-150 to blow on defrost?
A fan in the system.
Why would the air only blow out of the dash vents but not my floor or defrost vents in my 2005 Chevy cavalier?
Check the following.......... 1. Vacuum leak, broken vacuum line or disconnected vacuum line. 2. A/C - heater inside car door operation.. 3. A/C - heater controller..
What would cause heat not to come out of vents when set to floor and vents?
There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.
92 lumina and when you turn on the heat or air it will only blow from the floor and defrost it wont blow from the front vents what would cause this problem?
vacuum leak the vacuum reservoir is below the left head light, check the hoses
What would cause air to only blow from the defrost and floor vents and not blow out of the panel vents even when the switches are turned to the panel vents in a 2002 Ford Explorer?
Any of the following can cause this......... 1. Bad a/c - heater controller.. 2. Bad a/c - heater controller inside door operation.. 3. Bad, broken or cracked vacuum line/lines..
