95 tahoe Blend doors

[vendo]

yes 3 wires brown and ground have voltage i didnt check the white one..if i started it would probably be 12volts

 

[vendo]

I had volt meter on brown and black and voltage changed..should i check the white and ground?

 

[vendo]

can i test the acuator some how?

 

[vendo]

i put 12v into my old one and it moves no problem..small motor.

 

[east302]

I had volt meter on brown and black and voltage changed..should i check the white and ground?

Yes, check both. One will be a battery and the other will be a signal and is what changes based on the dial setting. I want to say it (the signal one) ranged from 1 to 12V or maybe it was 1 to 5. Something like that, but definitely a noticeable range that you can see on the meter.


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[vendo]

so the white one and the ground for the signal and turn dial..will try that tues after work..

 

[east302]

Went and checked mine (1998 model). White to ground is signal and varies from 12V (face vent panel dial setting or all the way counterclockwise) to about 0.5V on full defrost. It was around 6V at the 12 o’clock dial position.

Brown to ground is battery and was always 12V or so. Doesn’t change with dial position.


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[vendo]

what do i do if there is no signal from that wire?

 

[east302]

It would point to an issue with the control panel or damaged wiring in between it and the actuator.


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[vendo]

i just bought a new control head...

 

[vendo]

yea ...white and ground voltage goes up and down with the dial...

 

[vendo]

ok i put the old acutator back in and it moves,now my question is clockwise movement seems to be the defrost,how far does it move,for some reason i think it doesnt move enough clockwise,is it out of sync when i put it back in the thing is centered and it fits in the slot..1 more test is to see how much it turns while not connected to the heater box..clockwise

 

[vendo]

i see there is a stop going to the defrost side,so it moves as much as it can

 

[east302]

Not sure if it will help, but here’s mine at the three main positions. The position indicator dial’s notch tracks between the three marks or lines on the actuator.

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[vendo]

yea thats what mine looks like..not a ton of air to defrost,i will drive it and check it later,returning acutuator to amazon.. thanks al

 

[east302]

If the actuator turns between those marks and the linkages are intact, any diminished air flow is probably a problem with the damper or the top foam seal coming apart in the box and maybe blocking the duct. Without taking it apart, it would be guesswork.


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[vendo]

looks like a lot of work to take it apart..

 

[vendo]

i only get full floor when i put it on defrost/floor setting,comedy of errors i had,the head i put in didnt move actuator for defrost,so i got one from amazon and it still didnt move,bought new head..still nothing...put old one back and i get it to move..

 

[vendo]

is there any calibration things to do..or its just the way it is..putting it on floor makes it come out vents is screwy..

 

[warndogg]

Defrost is I think on upper left. The one in the middle (where the links meet) is I think the floor vent. Upper right is panel.

I think that’s right, lol.

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East302 have a question how do you get to this part in the picture? On my 96' the arm on the left keeps popping out up top and I have to crawl under the dash and re attach to get my defrost to work on driver's side after switching modes. Is there any easy way to drop that box?