99 Silverado Mode Door Actuator

[mgod12878]

hello all. a friend and i were putting a mode door actuator on my 99 silverado. after installation it will only blow air out the vent when you set it to defrost (and out the defrost when set on vent?? and it does not blow in the floor at all.. my friend is a mechanic but we are both stumped.. does anyone have any suggestions or experienced the same problem? thanks for your help in advance...

[jackyshaikh]

calibrate it with tech2??

i don't think it's binding, since it moves and you can work two of the air flows.. but i'm not a auto tech, just my truck and a friend that is a tech.. ase certified

 

If an actuator is out of range it may be possible to bring it back into range by following the procedure below:

 

 

1. <LI type=1>Turn ON the ignition, with the engine OFF. <LI type=1>Connect a 3 amp fused jumper wire between the actuator control circuit and the 5 volt reference circuit of the actuator connector. <LI type=1>Remove the jumper wire and actuator connector when the actuator is at the center position. <LI type=1>If the actuator doesn't move in step 2. Try installing the jumper wire from control circuit and the ground circuit of the actuator.

    

2. With the actuator in the center position, install the actuator to the hvac case and secure the mounting screws and then connect the actuator connector.

    

Well tech2 is dealer scan tool,which can be use to calibrate the actuators too.If your friend or you unable to perform above task.just leave it on pro tech.

 

confirm colour code grey wire is 5volts refrence,and white is control circuit,if you did't find these colour wires in mode actuator connector,do not perform it.

 

 

Connector Part Information

 

 

• 12064993

 

 

• 6 Way F Micro-Pack 100 Series (BLK)

 

Pin

 

Wire Color

 

Circuit No.

 

Function

 

5

 

BRN

 

341

 

Fused Ignition 3 Feed

 

6

 

WHT

 

119

 

Mode Switch Output

 

7

 

BLK

 

2450

 

Ground

 

8

 

--

 

--

 

Not Used

 

9

 

RED

 

708

 

Mode Door Position Sensor Signal (Upper)

 

10

 

GRY

 

598

 

Reference Voltage Feed (5 Volt)

[jackyshaikh]

 

 

<LI type=1>

1. Install the mode actuator as an assembly with the actuator cam.
   

 

1. •
   

Line up the heater/defroster valve lever with the mode actuator cam slot.

 

 

• Line up the A/C valve lever with the mode actuator cam.

 

<LI type=1>

Hope this helps.

 

 

[mgod12878]

thanks for the diagramitic.. that looks like we installed it.. just can't figure out why the air won't adjust to where you set it.. kind of seems that something is hooked up to the wrong thing..

<mode door actuator>

[jackyshaikh]

thanks for the diagramitic.. that looks like we installed it.. just can't figure out why the air won't adjust to where you set it.. kind of seems that something is hooked up to the wrong thing..

<mode door actuator>

 

 

I think you need to calibrate it with tech2.

[jackyshaikh]

thanks for the diagramitic.. that looks like we installed it.. just can't figure out why the air won't adjust to where you set it.. kind of seems that something is hooked up to the wrong thing..

<mode door actuator>

 

 

I think you need to calibrate it with tech2.

 

Are you sure the door is not binding before installing actuator on it?

[mgod12878]

calibrate it with tech2??

i don't think it's binding, since it moves and you can work two of the air flows.. but i'm not a auto tech, just my truck and a friend that is a tech.. ase certified