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Under the hood... There is a small "red" vaccuum tube from the firewall to the bottom of a canister on the passenger side and to a "t-tap" on the block. Mine got melted after a tune-up and I had to cut a small section out and replace it. A friend of mine had his disconnected after servicing at the dealer.
Answervacuum not reaching vacuum direction selector (you might think it is a switch) ( next to your ac on off control)but in actuality it changes the direction that the vacuum flows (draws) if no vacuum reachs selector, vacuum motor will stay in defrost position. I found my problem to be vacuum line disconnected under dash.
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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 does my air only blows out my front vents and not the floor or defrost on your 03 dodge ram?
There may be several reasons why the air only blows out the front vents and not on the floor or the defrost on the 2003 Dodge Ram. The fuses may be blown, or the heating coil is not working correctly.
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 cold air only blows from defrost vents on a 1995 Chrysler concord?
Cold air from the defrost indicates that the air doors are in the wrong position. The doors are vacuum controlled in most vehicles. check the vacuum system for a leak.
Why does your gmc sonoma blow only a little air out and the defrost only blows out the front vents?
why dont bottom vent doors not open on 2001 gmcsonoma
Your 2001 Chevy astro van blows air by the defrost vents only any ideas?
You lost the vacuume supply coming from the engine, defrost is the default mode if a mafunction in the vacuume supply is lost.
1994 cougar Air only blows out defrost vents?
The first thing that you need to check will be the vacuum hoses for leaks, breaks or loose fitting ones.....
1984 buick air conditioner only blows out the defrost vents?
The 1984 Buick uses vacuum lines to change air flow from defroster to ac vents. Check the entire vacuum system for leaks.
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 your air only blows out the front vents and not the floor are defrost on your 2003 dodge ram?
This is the same on all cars. When the air flow is OFF in a section, the it blows stronger to the other vents. In this case the ones for the windshield. This makes defrosting quicker so you can start driving safely sooner.
What is wrong if air blows out of the defrost vents only on 99 dodge ram?
Loss of vacuum supply to the HVAC controller. The vacuum supply comes from the pass side of the engine and goes through the firewall next to the AC lines. It is a small black line.
Why my 98bonneville ac blows only through defrost but not through vents please help.i checked all fuses?
Because your battery terminals are rusty. Have your dad clean them, and then check it again.
