Question about 2002 Nissan Sentra

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Airflow only comes out from front panal. When I turn the knob to defrost or feet airflow doesnt switch over

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Diverter is stuck in the hvac unit or the cable from the controls to the diverter is broken. need to remove the front console garnish to follow the cables

Posted on Apr 23, 2010

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Posted on Jan 02, 2017

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My lexus rx 300 fan/ac is blowing on the wind-shield only and does not blow throuhg the instrument panel. what could be the cause?


How long have you been driving or owned a car? Your A/C is set on front "defrost" instead of main. Turn off the defroster for the front and select the switch to read "main" or if your A/C panel uses icons to display, press the one where it looks like the airflow is blowing air (represented by arrows) towards you and not the windshield. The arrows on your buttons or electronic display refer to which way the air is flowing. Choose the one you want where the arrows show the airflow is blowing out towards you and/or turn off your defroster. (If you have a knob to select airflow, turn it so it is no longer on "defrost" and it points to the main airflow blowing outward).

Feb 07, 2015 | 2001 Lexus RX 300

1 Answer

1997 Ford Taurus front defrost not working


. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ?
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
  • The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
  • Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • Vacuum Control Motors The vacuum control motors (18A318):
    • are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
    • direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
    • The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).


vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

Jul 09, 2017 | Ford Cars & Trucks

1 Answer

Heater/AC vent option knob produces knocking sound in back right corner. i.e. the knob rotates from vents in front to half front half floor to all floor to half floor half defrost to all defrost. the...


If I am reading correctly you are hearing the vent doors moving to redirect the airflow to the vents you choose. This is normal and can be more noticeable if the blower fan is on, putting air pressure against the doors.

Jan 09, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

I have a 2007 Endeavor with the following problem: Air does not blow out of the front defogger to defog the windshield. You hear it blowing, but it is not coming out. I have switched the knob to change the...


The air flow is controlled by an actuator behind the dash. The part is sometimes called the heater control box. When you are selecting the air flow to change from the a/c controller. The signal is not being received to the actuator. The actuator is called the blend door.
You need to have the air /blend door actuator change. I think in this car is the air recirculation door. Same thing different name .

Good luck

Oct 31, 2009 | 2004 Mitsubishi Endeavor

1 Answer

Dash defogger does NOT blow on windshield. It blows thru dash only, regardless of setting (dash only, dash & feet, feet only, defroster only, defroster & feet, etc) Help?


this could be a simple switch problem, if it is a rotary switch, pull the front of it off and try turning the little knob with pliers, the cheap plastic used now sometimes rounds off if this isnt problem depending on type of switch electrical connections on switch could be bad or vaccum could be plugged or non existant

Oct 10, 2009 | 2003 Chrysler Town & Country

1 Answer

Cannot change air direction of airflow going to vents for heater/a/c.example cannot change from defrost to floor.


probllem can be one of two things either the switch on the dash control is bad and will not let it change or the blend motor is bad under the dash there are two or three of the these under there one moves from hot to cold one moves it around from dash to feet to vents best way to find out is to get someone to turn the knobs while you listen and look for them to move

Aug 27, 2009 | 2001 Dodge Dakota

1 Answer

Heater works ok but wont send air thru defrost vents


check the control knob it may appear to be working but is not turning the actual controller

Jan 01, 2009 | 1995 Pontiac Grand Am

1 Answer

Grand am heater works ok but wont defrost


check cable behind dials rod most likely off on that dial.

Jan 01, 2009 | 1994 Pontiac Grand Am

1 Answer

My heat/AC is only coming out at the face


TSB 03-01-38-005d, is to replace the foam in the mode door valve.
foam comes loose and prevent the mode door from moving.
The whole dash must be removed to installed the new foam.
Part number gm
89018656

Nov 17, 2008 | 2003 Pontiac Sunfire

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