0
What would make your AC and heater blow out of the defrost vents if you have it on normal AC or vent or mix 1993 Lincoln mark 8?
Wiki User
∙ 13y ago
It is your blend door actuator under the dash. This is the control that moves to determin where the air will come out. I have a 1993 Mark VIII and I have the same problem. My air blows out through the defrost and does not change. The cost to install this part at a dealer is $600 to $900. Here is a link that describes the problem.
http://www.markviii.org/LOD2/blend_door_reinforce.htm
Scott
CHECK THE VACUME LINE THE COMES OUT OF THE FIRE WALL ON PASS SIDE THE GOES TO THE CENTER OF THE INTAKE HARD PLASTIC LINE HAS A CRACK IN IT
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Why does your trucks defrost vents start smoking?
That's probably steam from a leaky heater core.
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 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.
What causes the front air conditioner on 1999 Lincoln navigator to stop blowing through the ac vents and start blowing through the defrost vents?
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
Selector only stays on defrosted 92 buick?
If the heat selector will not switch from defrost to the dash or foot vents on a 1992 Buick, it is possible that the cable connected to the vent is broken. When the selector is moved from defrost, a cable opens the other selected vents on the heater.
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
How do you know which heater core you need to replace on a 94 ford aerostar front or rear you have heat but no defrost and stream comes out of the vents when heat is on?
Front heater core is in the dash, the rear heater core is all the way in the back of the vehicle. If you have steam coming out of the dash vents, the front HC is leaking. If you have steam coming out of the rear heater vents, then the rear core is leaking.
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.
Why is there smoke and a piss smell coming from the front vents on a Lincoln Navigator?
you need a new heater core
Why wont my wrangler heater change vents from defrost to panel?
Check that the linkage that controls the damper is connected and working. The linkage is just above the gas pedal.
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.
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..
