Question about 1994 Chevrolet K1500

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A/c blend door

I own a 1994 Chevy Silverado Xtended cab P/U. When key is turned to on position, A/C blend door makes a cranking? sound. It continues for about 5 seconds then stops. It does this also when air flow direction is changed. A/C operation is not affected by this. This cranking sound also occurs when vehicle is switched off. Cranking? noise can be heard from outside vehicle. Noise is coming from area of blower moter and heater core location. Would appreciate any help you could offer.

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  • ecryz250f Mar 05, 2009

    I have a 94 K1500 (5.7L 4X4) single cab that makes a ticking noise from the blower motor "area" when I turn my truck on and off. The ticking noise lasts for about 30 seconds and is VERY annoying. It also makes the same sound when I switch from A/C to MAX A/C (REC). I just replaced the blower motor but heat is very poor even when truck is warmed up.
    -What parts need to be replaced and could you show me a diagram of where these parts are?


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Blower motor is hitting on the casing more than likely.it could be wearing out or the bearings going bad in the motor

Posted on Aug 09, 2008

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I need to know how to get to the blend door in the heater area of my '92 chevy c1500. I was told that is what makes a thumping noise when the key is on or off.


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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).
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  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.
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    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

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