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Hello, I am helping a friend of mine with an A/C problem and while searching the internet for help for him. I ran across alot of people complaining about a blender door problem which might help you. Here is the link to a website that displays how to resolve a blender door problem. It may prove worth you while to check it out.

http://www.blenddoorfix.netfirms.com/

Jeff

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โˆ™ 2011-10-18 21:07:11
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Q: What would make your AC and heater only blow out of the defrost vents if you have it on normal AC or vent or mix?
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Why does heater defrost vent not open on a 1989 Sunbird and cold air blow from dash vents but no air blows from heater defrost vents and where are the enter and exit hoses for the heater coil?

I don't know why the vent would not open for the defrost, but it may be related to the fact that your heater core is blown. If your getting nothing but cold air out of the vents when the heat is on, your core is finished and if the core is finished then it is likely related to your vent not opening/switching. Something''s wrong with your heating either way.


1991 Chevy G20 van- Why won't airconditioning blow out of dash vents instead of defrost and heat vents?

I had a Chevy van of this vintage and I found a vacum hose leak in the controls that would make the heater/defrost door default too defrost open. lisining carefully under dash or under hood may pinpoint leak. I had a Chevy van of this vintage and I found a vacum hose leak in the controls that would make the heater/defrost door default too defrost open. lisining carefully under dash or under hood may pinpoint leak.


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.


What would cause Water to blow into the car from the defrost vents?

If we are talking rain water not engine coolant I would suspect the drains under the cowl are plugged up with debris (leaves and such). If it is engine coolant then I would suspect the heater core is leaking.


Why would hot steam blow from the heater vents?

Leak in heater core. Replace core.


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.


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 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..


Why would the air conditioning only blow air from the defrost and floor vents and not the dash vents?

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.


Why would your heat only work on defrost?

ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?


Why would coolant leak through the vents in your jeep wrangler?

Leaking heater core


Why would your air conditioner blow out of the defrost vents ON 2000 F-350?

You probably have a jammed or otherwise defective vent door.


Why would you smell antifreeze through your defrost?

Blown Heater Core - The heater fan blows past the heater core and if it has a hole in it your antifreeze ios being blown onto your windshield.


Why do you keep blowing fuses when you turn on the heater fan but when you take out the compressor fuse it doesnt blow the fuses?

The compressor is coming on because you have the heater set to defrost. Take it off defrost and the compressor will not come on. I would suspect the compressor is locked up.


Why Heater vents are usually placed near the floor?

Warm(er) air rises - if vents were high up there would be little circulation without fans.


Why would the ac only blow out the defrost vents in a 1997 GMC Jimmy?

check your vacum line to door by the gas pedal for vacum


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.


What would make antifreeze come out of the defrost area on a 1991 mercury grand marquis?

Heater core leaking.


Why would smoke pour from your ac vents without the ac running?

The heater core is leaking coolant.


Why would smoke come out of AC vents?

If that smoke is more like steam, you have a leaky heater core.


Why does the anti-freeze leak through the vents on a 96 Chrysler lhs?

Check the heater core, it is probably bad. It could be heater hose connections to the heater core, but I would bet on the heater core going bad.


What would cause the defrost on a 1995 gm suburban 1500 blow cold air when the heater core is new?

alve, check vacum line first (on heater valve)


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......


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.


What would cause a burning rubber smell to come from the vents of your 91 Chevy Cavalier?

Bad heater core.