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Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
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∙ 13y ago
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Why doesn't heat blow out floor only?
the heat blows out the defrost when it should blow out floor vents only
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 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.
'2000 gmc jimmy no floor heat but has defrost and vent heat'?
my 1998 gmc jimmy has no floor heat but i have defrost and ven heat
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
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 doesn't heat nor cold air blow out of front or floor vents but does out of windshield defrost vents?
It sounds like your vacuum controls are stuck on the defroster I had that happen and I sprayed a lubricant into the vacuum lines and it cleared up
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.
I have a 2002 Ford Explorer that is get low air flow from the defrost vent when the defrost unit is selected. Most of the air flow is going to the floor vents. Is the blend valve bad?
Hi, It is not the blend door, that is for heat/cold changes. The mode door could be the problem, or stuck defrost door.
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 does the blower motor do?
it is the moter that spins the fan that blows your heat or ac out of your vents
My 03 trailblazer blows heat out of the back vents when set on ac sometimes any clues what supplies heat for the back?
If your 03 Trailblazer blows heat out of the back vents when set on AC sometimes, it could be because of a faulty blower motor resistor block.
