Question about 2003 Lexus RX 300

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No air flow in dash from a/c

Air only coming out at windshield and floor; no air through dash vents

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Ventt hatches stock in close position, lever mechinsim broken or stock

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My 1999 buick park avenue a/c will blow out at window vent and floor vent but not at dash vent


It's one of the blend door motor drive gears that has cracked. As the motors try to move the blend doors to divert the air flow, the gear attached to them slips on the drive shaft. You need to remove them, inspect for the broken or cracked drive gear and replace them. This is a very common problem with these older GM vehicles.

Aug 18, 2014 | 1999 Buick Park Avenue

2 Answers

I have a 2007 dodge 2500 diesel and the heater will only heat up to a very light heat.


Mode Door 1.
a.This door regulates air flow to either the dash vents or defrost/floor. If you have air flowing only through the vents with no defrost or floor, this door is failing. From our experience, this door is usually the first domino to fail. Not sure why, just is.
<!--[if !supportLists]-->4.Mode Door 2.
a.When mode door 1 is set to divert air away from the vents and into the second stage of the system, door #2 chooses whether air goes to the defrost vents to the windshield or out through the floor vents in the passenger and driver's side footwells. Failure is indicated by an inability to choose between defrost and floor.
b.This door turns out to be the most difficult to replace. In order to replace the door, the dash panel has to be removed. It's still better than the dealer fix because you don't have to evacuate the AC system, drain the radiator, and remove the plenum box. But it is more work than the other fixes. When this door breaks, it falls in the down position, blocking the floor vents and diverting all air through the defrost vents. From a safety standpoint, this is good since you'd most likely rather have a clear windshield than warm feet. We suspect that a large percentage of customers will just leave this door unrepaired. You will have heat through the dash vents and to the windshield, just nothing to the floor. It's inconvenient, but you'll have to make the determination if warm feet are worth the extra work to fix the door. An extra pair of socks is easier.

Jan 12, 2013 | 2007 Dodge Ram 2500

1 Answer

Heat and ac switches between floor, dash, and windsheild


the door for the air flow is controled by vacuum operated motor. there is a leak in that vacuum circuit. when accelerating, engine vacuum drops until the rpm levels off. when there is no vacuum to the motor, the default postion directs air flow to the defrost vents to make sure you're able to clear the windshield.

May 27, 2010 | 2004 Ford Crown Victoria

1 Answer

Heat and AC vent problem.


most likley you have a vaccume leak somewhere but also the linkage to the door that that directs the air flow may be in a bind. another possability is the hvac controlls. hope this helps

Jun 08, 2009 | 1998 Ford Windstar

1 Answer

HVAC vent selector does not function. Air flow is


THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)

Mar 09, 2009 | 2002 Buick Rendezvous

2 Answers

Can not adjust the direction of air flow for the heater or defros


or it could be that you need to replace the air filter that is located underneith the dash on the passanger side slightly to the left

Nov 17, 2008 | 2005 Chrysler Pacifica

2 Answers

No dashboard heat output


The climate control was poorly designed on these cars.

There is only heat on the floor and defrost settings, due to the layout of the ductwork.

Oct 22, 2008 | 1989 Ford Festiva

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