Question about 2003 Chevrolet Silverado 1500

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Is the correct name for the part that controls the air flow from a/c to defrost called the A/C Heating Servo Unit, the defrost does not completely defrost the front windshield but the a/c works just f

2003 CHEVY SILVERADO The defroster seems to not be defrosting the windows completely when in operation.. Does this concern the a/c door that may not be allowing the air to completely come threw the vents.. What is the part called needed to replace is it the A/C Heating Servo Unit

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Well it would be the "mode door GM pt#88986538" or the "mode control cam actuator GM pt#89023358" on the side of the heater case. The door would control where the air comes out and the actuator tells the door where the setting is at on the control head.

Posted on May 14, 2009

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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

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1997 toyota camry climate control switch or servo not working fully


Blend doors not working. They are controlled electronically by small motors. Could also be something fell down in a vent and is blocking it from it's full range of motion.

May 26, 2017 | 1997 Toyota Camry

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Where is the heater core located


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LEGEND
1 Clip
2 Dust and Pollen Filter
3 Air intake housing
4 Defroster air outlet
5 Side window air outlet
6 Heating and A/C controls
7 Air outlets
8 Instrument panel cross member
9 Defroster duct
10 Servo motor for fresh/recirculating air door -V154-
11 Ambient temperature switch -F38-
12 Gasket
13 Evaporator water drain guide
14 Heating and A/C unit
- Heater core
- Evaporator
15 Fresh air blower -V2-
16 Fresh air blower series resistance with fuse -N24-
17 Center air outlet
18 Control panel trim
19 Center trim
20 Heating and A/C cables
21 Heater core
22 Left rear duct
23 Lower duct
24 Upper duct
25 Footwell air outlet
26 Instrument panel cross member, left side member securing bolt
27 Relay
28 A/C cut-off control module -J314-
29 Instrument panel
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Jun 03, 2011 | 2000 Volkswagen Passat 4Motion

1 Answer

Heat does not come out passenger side of the car but comes out drivers side


There is a blend door problem.

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prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

Oct 28, 2010 | 1998 Oldsmobile Regency

1 Answer

2001 pontiac montana heating/ac ca not change air flow from defrost to vents


There is a actuator servo not working,check for a vacuum not connected,or broken,or sucked together,under the hood,look for a plastic vacuum line that maybe broken,this is a vacuum problem.If this was at all helpful,please rate,thank you.

Jul 17, 2010 | 2002 Pontiac Montana

1 Answer

Climate control system only blow air out defrost vent


there is a good chance that you blend air door is stuck closed over your heater core and therefore not allowing the heat to flow, also your door that opens and close your direction of flow from the floor ,das,vent and defrost.your going to have to remove the lower cowling of the dash on the passenger side analso some of the center dash to actually check to see if the cable,servo motors. are acuating the doors.the issue could be just a stuck door or a misaligned cable or that it came off. that falls under the mechanical side of probabilities. electrical would most likely be a faulty selector switch or a servo motor

May 15, 2009 | 2002 Ford Expedition

1 Answer

2001 ford focus defroster blows out ac vents


may be just a cable adjustment.


SECTION 412-01: Air Distribution and Filtering 2001 Focus Workshop Manual DESCRIPTION AND OPERATION Air Distribution and Filtering The new heating and ventilation system ensures even air distribution.
The temperature control and air distribution flaps are controlled by two operating cables. All vehicles have a recirculated air function, with the flap controlled by a servo motor.
Air is supplied to the windscreen and side windows regardless of the air distribution setting.
The clean air filter is fitted as standard in most countries. This cleans the incoming fresh air of pollen and dirt particles. It must be renewed after every 40,000 km under normal operation conditions, or after 20,000 km under difficult conditions. If no clean air filter is installed, a plastic grille is fitted over the air intake. This can easily be replaced with a clean air filter.
Air distribution operating switch
Face level The main flow of air enters the passenger compartment at face level.
Face level/floor level The main flow of air enters the passenger compartment in equal parts at face level and floor level, and a small amount flows to the demister nozzles of the side windows.
Floor level The main flow of air enters the passenger compartment at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist/floor level The main flow of air enters the passenger compartment in equal parts at the windscreen and at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist The main flow of air enters the passenger compartment at the windscreen and a smaller amount flows to the demister nozzles of the side windows.
Air distribution operating switch Air distribution operating cables
NOTE: The Bowden cables for LHD and RHD vehicles are identical. However, they are fastened to the air flap operating mechanism with the respective reverse side of their connectors.
The air distribution switch operates with two Bowden cables. The cables operate the air distribution valves in the heater housing.
To remove and install the cables, the rotary switch must be turned as far as it will go to the left. The air flap mechanism engages easily in this position, making the installation of the cables easier.
--------------------------------
Air Distribution Cable Control Assembly Removal
s1y~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Disconnect the battery ground cable. For additional information, refer to Section 414-01 .
  1. Remove the radio/cassette unit and the CD player (if equipped). For additional information, refer to Section 415-01 .
  1. Remove the bezel with heater/air conditioning controls.
  1. Remove the bezel with heater/air conditioning controls (continued).
    • Pull off seven electrical connectors (six shown).
  1. NOTE: To remove the Bowden cables, turn the rotary switches as far as they will go to the left.
    Remove the bezel with heater/air conditioning controls (continued).
    • Unclip the Bowden cables.
  1. Remove the lower driver's side footwell trim.
  1. Unclip and remove the air distribution Bowden cables.
  1. Unclip and remove the temperature control Bowden cables.
    • Unclip and remove the temperature control Bowden cables.
Installation
  1. NOTE: Route the new Bowden cables without kinks and check for easy accessibility.
    NOTE: To install the Bowden cables, turn the rotary switches as far as they will go to the left. The mechanism engages easily in this position.
    NOTE: The Bowden cables are identical for RHD and LHD vehicles, although they are fastened to the air flap operating mechanism with the reverse side of their connectors.
    Install the components in reverse order.
  1. Check operation of the Bowden cables.

Mar 17, 2009 | 2003 Ford Focus

1 Answer

The heating unit blows air from defroster and floor only


defrost is a default if vaccum is lost from engine.. check behind batt in engine comp to see if batt has been leaking. this can cause the acid to drip on small black vacc lines from engine and cause a leak in the vacc system causing it to only blow in defrost . you can fix by cutting damagged vaccumm line and install a small rubber hose over cut ends .. the vaccum lines run between batt and fire wall

Mar 10, 2009 | 2003 Ford F150 Regular Cab

1 Answer

No heat, when I turn on heater- all cold air flows out


sounds like you have a stuck blend door in the HVAC system. If its not controled by vacuum the servo motor is bad or the vacuum line is bad. This door moves back and forth to go from vent to floor to defrost. and you have one to go from cold side to hot side. Hope this helps you

Jan 17, 2009 | 1999 Buick Regal

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