Question about 1999 Chevrolet Silverado 1500

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It sounds like the blend door in the air ducts on my 1997 Chevrolet Silverado Ext. Cab just keeps flapping and flapping and won't stop. Every now and then it will quit doing it for a while but then it will start again when I start up the engine. Sometimes I can leave the ignition in the "on" position without starting up the engine and after a period of time in will stop. But after a few more times of getting in and starting up it begins flapping again. It drives me crazy. Can you help?

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What i do in cases like this is to wedge it in the open position with a piece of wood or put a spring on the operating lever to hold it open so you are only using the recirculate mode which is good enough if you use the AC a lot

Posted on May 19, 2011

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2 Answers

1999 chevy silverado heater fan only blows cold air , both coolant lines in are hot


I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.

Jan 10, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

My 2005 2500 HD Duramax is not getting any heat inside cab. Engine is not running hot and coolant level is fine. Turned the heater controls up and down fast today and ot some heat for a while.


The temperature of the air coming out of the ducts is controlled by a door that moves between the heater core and the AC core, it is called the "blend" door for obvious reasons as it blends the hot and cold air streams to give the desired air temperature at the dash vents. The door is controlled by a small gear drive DC motor called the blend door actuator, what happens in most case is the actuator is damaged by a blend door that is warped from heat being hard to move or not moving at all which is the case with your truck. The blend door and its actuator should be replaced as one repair, the dash must be removed from the truck to access the air ducting that contains the blend door, you absolutely need a service manual to complete this job, it takes about 10 hours.

Feb 09, 2012 | 2006 Chevrolet Silverado 2500HD 2WD

1 Answer

Interior blower only blows up to warm on 1997 A4 2.7ltr


Check the blend door cable for proper attachment to the control panel and to the blend door. Try opening the door manually to see the you can get hot air out. If not, the door may be broken inside the heater box. If yes, correct/adjust the cable attachment for proper operation.

REMOVAL & INSTALLATION
1990-97 Passat Models
Install the cable ends marked with a white or blue band to the control head assembly. The cables must be attached to the control head before connection to the system air flaps.
  1. Remove the climate control head from the center dash assembly to access the control head cable ends.
  2. Remove the lower dash panels as necessary to access the cable lever arms.
  3. Attach the airflow distribution cable (cable 2) to the airflow distribution knob's lower control lever.

This cable can be identified as follows:
Operates the mode/central air flap Cable has a black sleeve and is 25.0 inches (634 mm) long Cable is marked with a white band
  1. Press the cable's sleeve against the control head stop and install the retaining clip.
  2. Attach the temperature control/air blend cable (cable 3) to the air temperature knob's control lever.

This cable can be identified as follows:

Operates the temperature control/air blend cable air flap Cable has a blue sleeve and is 21.0 inches (535 mm) long Cable is marked with a white band
  1. Press the cable's sleeve against the control head stop and install the retaining clip.
  2. Attach the airflow distribution cable (cable 1) to the airflow distribution knob's upper control lever.

This cable can be identified as follows:


Operates the footwell/defroster air flap Cable has a black sleeve and is 37.5 inches (954 mm) long Cable is marked with a blue band
  1. Install the cable such that the blue band is over the retaining clip mount and install the retaining clip directly over the blue band.
  2. Install the climate control head.
  3. Set the air flow distribution knob to defrost.
  4. Connect the longest airflow cable (cable 1) to the footwell/defroster flap lever on the heater's air box.
  5. Press and hold the flap's lever toward the retaining clamp perch and install the cable retaining clip.
  6. Set the airflow distribution knob to the Vent position.
  7. Connect the short airflow cable (cable 2) to the central/mode flap's lever.
  8. Pull and hold the mode flap's lever away from the retaining clamp perch and install the cable retaining clip. Check the operation of both air flaps making sure they can be heard contacting their stops.
  9. Set the temperature control knob to full cold.
  10. Connect the blue-sleeved cable (cable 3) to the air blend/temperature flap's lever.
  11. Pull and hold the mode flap's lever away from the retaining clamp perch and install the cable retaining clip. Check the operation of the air blend/temperature flap making sure it can be heard contacting the stops.

11_24_2011_10_52_22_pm.gif

Fig. Side view of the control head and cable location. 1. Footwell/defrost flap cable-2. Air distribution cable-3. Temperature control flap cable

11_24_2011_10_53_58_pm.gif

Fig. Temperature flap cable location and adjustment

Nov 24, 2011 | 1998 Audi A4

1 Answer

The driver side only blows cold air. The passenger side works correctly. How can you tell if the problem is a broken blend door or actuator? Is the driverside blend door actuator easy to replace? This...


Yes it is most likely a vacuum actuator there are more then one . They open and close little doors in the ducts to deriect air flow inside the ducts . They are not easy to get at in most cases however you should look at all vacuum lines going to and near the unit its controlled by engine vacuum . exhust all other opptions first before takeing the dash out . The problem could also be electrical check the control switches make sure the switch is not bad on one side . Spend some time looking and thinking before you start riping things apart. Good luck with it

Sep 18, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

When A/C is on, hot air blows out on drivers side, but cold air blows out on passenger side. Checked freon and that is not the problem. What could be causing this and how can it be fixed? Its a 2003...


There is an obstruction in the air duct. In some GM products, a blend door is incorporated in order to accomodate both people in the front seat. This blend door seems to be stuck, or the switch/vacuum operation for it may no longer be working. You probably won't fix it without a major headache. Usually the dash has to be removed. Sometimes the air box on the passenger side floorboard, can be removed and the blend door is in there. I hope for your sake and pocket book that it is there on the passenger side.

Jun 13, 2011 | 2003 Chevrolet TrailBlazer

2 Answers

MY 1995 SILVERADO 1500 EXT. CAB TRUCKS


sounds like your hydraulic clutch has failed. I would reccommend an internal inspection of your transmission by a mechanic.

Jun 05, 2009 | 1995 Chevrolet Caprice Classic

1 Answer

Heater won't heat in cab


if the inlet and outlet hoses are getting hot to the heater core then the problem is the air temperture control blend door actuator in the heating/A/C ducts, this door directs air flow either across the heater core or the AC evaporator or mixes the 2 air flows for a desired temp at the outlets, hence the name blend door, to change this part u must remove the dash assembly.

Jan 05, 2009 | 1997 Dodge Ram 1500 Club Cab

2 Answers

Heating system only blows out hot air through the vents


I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado
  1. Remove the floor air outlet duct extension (1) from the floor duct (2). 0900c152801c9c8a.jpgRemove the floor air outlet duct extension (1) from the floor duct (2)
  2. Disconnect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  3. Remove the blend door actuator mounting screws from the HVAC module.
  4. Remove the blend door actuator as an assembly with the actuator cam. 0900c152801c9c8c.jpgRemove the blend door actuator mounting screws from the HVAC module
To install:
  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2. Line up the A/C valve lever with the blend door actuator cam
  2. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
  3. Connect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).
C/K Series
  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2. Remove the screws.
  3. Remove the adjuster links from the control lever.
  4. Remove the mode actuator.
  5. Adjust the mode actuator by completing the following steps:
    1. Connect the electrical connector to the actuator.
    2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    3. Turn the ignition switch to the OFF position.
    4. Remove the actuator from the electrical connection. 0900c152801c9c8d.jpgBlend door actuator-C/K Series
To install:
  1. Install the mode actuator.
  2. Install the screws.
  3. Install the adjuster links to the control lever.
  4. Connect the electrical connector.
  5. Test the circuit operation

Nov 27, 2008 | 2001 Chevrolet Silverado

1 Answer

1999 1500 silverado heater


Sounds like the blend door in the ducting has failed, this door is what controls the temp of the outlet air by blending heat and outside air or AC cooled air.

Nov 01, 2008 | 1999 Chevrolet Silverado 1500

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