Question about 1999 Chevrolet Silverado 1500

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Climate control damper door constantly opening and closing

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  •  Jessica Hodges
    Jessica Hodges Nov 11, 2012

    When does it do this?  Sounds like an acctuator problem, whether vaccum leak, or bad diaphram

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  • 156 Answers

Sounds like a bad relay or vacuum leak

Posted on Nov 11, 2012

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1998 Jimmy with electrical controls for temperature. Replaced Themostat, Flushed heater core, replaced damaged vacuum lines. Vehicle produces heat to heater core but only luke warm interior temp. Rotated...


Suggestion: see if the blend door opens or closes completely to allow all air through the heater core. To see the blend door moving, remove the panel that says "Cut here for service" under the hood along the firewall. I have a 99 Bravada where the blend door keeps moving back and forth constantly. Changed the blend door actuator but still keeps moving. The air inside is only warm since the door keeps allowing bypassed air through.

Jan 04, 2011 | 1998 GMC Jimmy

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Only cold air is available, what can I do to fix the blend door temporarily


I would repair the problem if I have to disassemble the varioius parts to get at the air doors --- In-Vehicle Temperature Sensor Removal & Installation To Remove:
In-vehicle temperature sensor ford-10-00-433.gif

  1. Remove the climate control head.
  2. While pressing the retaining tabs inward, remove the in-car temperature sensor.
To Install:
  1. While pressing the retaining tabs inward, install the in-car temperature sensor.
  2. Install the climate control head.
---
Air Door Actuators/Motors Removal & Installation Air Inlet Door (Recirculation) Vacuum Motor To Remove:
  1. Remove the instrument panel.
  2. Remove the air inlet door motor mounting screws. CAUTION
    Do not attempt to bend any part of the air inlet duct door lever.
  3. Rotate and remove the air inlet door vacuum control motor.
To Install:
  1. Rotate and install the air inlet door vacuum control motor.
  2. Install and tighten the mounting screws.
  3. Install the instrument panel.
Defroster Door Vacuum Motor To Remove:
  1. Remove the passenger air bag module from the instrument panel.
  2. Disconnect the vacuum line and remove the mounting screws. CAUTION
    Do not attempt to bend any part of the defroster airflow mode door lever.
  3. Rotate and remove the vacuum control motor from the defrost door lever.
To Install:
  1. Rotate and install the vacuum control motor on the defrost door lever.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum line to the vacuum control motor.
  4. Install the passenger's air bag module.
Floor Console Register Duct Vacuum Motor To Remove:
  1. Remove the floor console.
  2. Remove the right-side instrument panel insulator.
  3. Working from the passenger's footwell, disconnect the vacuum hose.
  4. Remove the screws and the floor console register duct vacuum control motor. CAUTION
    Do not attempt to bend any part of the floor console register duct door lever.
  5. Rotate and remove the vacuum control motor from the floor console register duct door.
To Install:
  1. Rotate and install the vacuum control motor onto the floor console register duct door.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum hose to the floor console register duct vacuum control motor.
  4. Install the insulator under the dash.
  5. Install the floor console.
Panel/Floor (Heater Air Damper) Door Vacuum Motor To Remove:
Panel/floor door vacuum control motor shield ford-10-00-403.gif

  1. Working through the driver footwell, remove the two screws and the shield. CAUTION
    Do not attempt to bend any part of the airflow mode door lever.
  2. Label and disconnect the two vacuum hoses.
  3. Remove the vacuum control motor mounting screws.
  4. Lift, rotate and remove the panel/floor (heater air damper) door vacuum control motor from the door lever.
To Install:
  1. Install the panel/floor (heater air damper) door vacuum control motor on the door lever.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum hoses in their original positions.
  4. Install the shield on the vacuum motor.
Temperature Blend Door Actuator To Remove:
  1. Remove the integrated control panel.
  2. Remove the right-side lower instrument panel insulator.
  3. Lower the glove compartment.
  4. If equipped with Electronic Automatic Temperature Control (EATC), remove the 2 remote climate control module screws and position the module aside.
  5. Remove the temperature blend door linkage shield.
  6. Disconnect the temperature blend door electrical connector.
  7. Remove the temperature blend door actuator mounting screws.
  8. Remove the temperature blend door actuator.
To Install:
  1. Position the temperature blend door actuator on the plenum.
  2. Install the temperature blend door actuator mounting screws.
  3. Connect the temperature blend door electrical connector.
  4. Install the temperature blend door linkage shield.
  5. If equipped with Electronic Automatic Temperature Control (EATC), reposition the remote climate control module and install the 2 mounting screws.
  6. Raise the glove compartment.
  7. Install the right-side lower instrument panel insulator.
  8. Install the integrated control panel.
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Nov 05, 2010 | 2000 Ford Taurus

1 Answer

Climate control issues, heat stays on even when switch is off. What might the problem be?


98 olds. bravada. alternator and battery played out, so i installed both new ones easy money.the problem it created was my a/c damper door constantly opens and closes no matter what you turn the controls to. its working as far as the a/c but the air mix door want stay in the position it needs to stay in to keep getting cold air. i have checked every thing i possibly can. just so you know all was working perfect untill i had to put the battery and alternator on it. please help my truck gas mileage sucks,and the bravada is tolerable but cant its hot in va.

May 23, 2010 | 1998 Oldsmobile Bravada

4 Answers

Climate controls


Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

May 21, 2009 | 1997 Lincoln Continental

1 Answer

Constant high heat


on climate control press off and heat button and let go quickly. Then press automatic. The display will start rotating eventually displaying a code 025,125 , 024 etc. Then press defrost to stop. You may hear blend door operating atb that time. It worked for my climate control.

Apr 30, 2009 | 1996 Lincoln Town Car

1 Answer

Looking for the Heating and Cooling Vacuum lines.


First you need to find if it will switch through all modes, defrost, floor, etc... if that works, but temp does not change as commanded you probably need a new temp door actuator on that side. Assuming the vehicle has climate control.

Jan 12, 2009 | 2004 Chevrolet Impala

1 Answer

Heat works in the rear but not in the front,the blower works but it blows cold air


damper in duct to change air flow from heat to air is not working most probably. I am almost certain the navigator will have an actuator motor that has stripped, or the motor has gone bad this is constantly working when you use climate control to control air temperature.

Dec 23, 2008 | 1999 Lincoln Navigator

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