Question about 2002 Chevrolet Silverado 2500HD

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My air vent is stuck in the defroster mode will not move to the front vents or floor vents when the dial selector is turned. Is this controled by vacum or electronic?

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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philriden
  • 146 Answers

SOURCE: 1998 Mustang - AC blows only through Defrost vents

You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

Posted on Jan 05, 2009

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  • 1 Answer

SOURCE: There is no air flow

You need part GM Part number 89018675 or ACDelco 15-73596. The Mode Selector Actuator. What happens is the part is a CHEAP part POORLY designed and when it goes to turn the flaps inside the HVAC unit its the plastic gear slips instead of turning the flap!!!

Just to forward you you might want a deal to install this art for you unless your good at fixing your own vehicle, because you need SMALL sockets and a lot of patience to get this part in!!!

The part is ALMOST directly above the steering shaft for your steering wheel, so theres a lot you got to remove before you will even see them!!!

I only recommend you to have a dealer put this part in for you, unless you have your own service manual!!

Because there is 5 of these darn things and if you pick the wrong one you will have to do it all over again!!!

3 on the Drivers side and 2 on the Passengers side!!

But replacing this part SHOULD solve all your problems!! AS it did for me and i was having the same issues as you have described!!


Posted on Jul 22, 2008

  • 1118 Answers

SOURCE: 1999 Chevrolet Suburban ac selector door motor.

it should be under dash next to gas peddle on left end of heater box not that hard 2 screws and a plug. its called heater blend door actuator.

Posted on Jan 28, 2009

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

  • 150 Answers

SOURCE: AIR FLOW STUCK IN DEFORST VENT WILL NOT SWITCH TO FLOOR OR AC VEN

The "MODE" door works off of an electric motor.

Posted on May 08, 2009

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1 Answer

My air runs cold but is stuck between defrost and front vent. How to fix


Pull the control panel out of the dash and see if the mode control vacuum switch has a good vacuum source or the switch itself leaks vacuum. The mode control is what moves the doors that diverts the air flow around to the vents, defrost and floor.

Sep 20, 2016 | 2004 Hyundai Elantra

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Why does turning vent knob (defrost, mix, dash,floor,etc.) have no effect?


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1 Answer

There isn't any air flow coming out of the front vents when the air conditioning or heater is on. Only air coming from the defroster and floor vents.


There is a mode selector in the plenum that controls where the air comes out. That flap inside is either broken, loose or has a bad control.

Aug 20, 2015 | Cars & Trucks

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

MY DISTRABUTION DIAL FOR DEF.,VENT, ETC IS IN DEFROST AND WON'T CHANGE. THE DIAL TURNS BUT NOTHING CHANGES. I NEEN SOME ADVICE ON WHAT TO DO TO FIND PROBLEM AND FIX. THANKS GENO


Here is the info. I hope the pictures show up. please rate assistance. thx.

Air distribution within the vehicle is determined by the function selector switch position. Two airflow mode doors are used to direct airflow within the heater core and evaporator core housing. The function selector switch/cable assembly is used to position these airflow mode doors. Refer to Section 412-00 for description and operation of each of the system functions.
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Function Selector Cable Assembly
The function selector cable assembly moves the airflow mode doors to the desired position using a 2-sided pull-pull type cable assembly. The function selector controls the cable movement. The end of the cable assembly attaches to the airflow mode door/temperature blend door actuating assembly which transfers the cable movement to the 2 airflow mode doors.
An electrical switch is incorporated into the function selector to notify the A/C switch assembly if DEFROST or FLOOR/DEFROST is selected. When DEFROST or FLOOR/DEFROST is selected, the A/C switch assembly will disable the RECIRC request button and send an A/C request to the powertrain control module (PCM) regardless of the A/C request button indicator ON/OFF status.
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SECTION 412-01: Climate Control 2005 Focus Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 02/25/2004
Function Selector Switch adobe.gif Printable View (173 KB) Removal and Installation
  1. Remove the 4 bolts and position aside the lower steering column cover.
    a0093241.jpg
  1. Remove the function selector knob.
  1. Remove the center instrument panel finish panel.
    • Disconnect the cigar lighter electrical connector.
    a0093247.jpg
  1. Detach the function selector switch.
    1. Disconnect the electrical connector.
    1. Remove the screw and detach the function selector switch.
    n0037059.jpg
  1. Detach the function selector cable and remove the function selector switch/cable assembly.
    e0000109.jpg
  1. To install, reverse the removal procedure.

Aug 04, 2011 | 2005 Ford Focus

1 Answer

Heater not blowing air out of ducts


CHECK THE FAN AND SEE IS IT IS EVEN BLOWING PERIOD. IF IT IS THEN SEE IF THE SELECTOR IS NOT MOVING IN THE BOX UNDER THE DASH. THIS SELECTOR ALLOWS FOR FLOOR VENTS, FRONT VENTS OR DEFROSTER IF SO EQUIPPED.IT MAY JUST BE THE CABLE IS EITHER STUCK OR BROKEN UNDER THE DASH. GOOD LUCK!

Dec 11, 2010 | Chevrolet 1500 Cars & Trucks

1 Answer

2003 Chevy trailblazer, the 4 front dash air


{: ) Check first the fuse labeled HVAC1 10A at the rear fuseblock. If okay, the mode actuator could be faulty. You can try this: turn ignition switch and a/c off for a minute. Then turn ignition on, wait forty seconds. Afterwards, start the engine, and check your a/c again.

Aug 01, 2010 | 2006 Chevrolet Trailblazer

2 Answers

Air Conditioner Will not turn on Recirculation


there is a selector motor on the side of the heat ac coil box under the dash. it should have 2 or 3 levers on the side of it. it controls the dampeners the select where your air is moving to from the defrost to the bi level to the floor or all of the above find that control module and then turn the car on and start moving the selector switch back and forth slowly while watching that module if its moving the levers then you have a more serious problem and need to have a professional look at it. check to make sure that the levers are even connected and that the wiring harness is even hooked to the control module

Jul 13, 2010 | 2001 Chevrolet Venture

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