95 tahoe Blend doors

[vendo]

How many blend doors are on these trucks,i barley get defroster on this 95 tahoe..i replaced heater controls..95 is a 1 year heater control and on ebay they want 750 for 1 of them..any ideas..

 

[exp500]

There is also a crossover wiring adapter for using a later switch that fits same hole in dash. Look in the threads. Might get lucky and somebody here has one.

 

[vendo]

I had one of those on the truck when i got it but nothing worked,,so i got a 1995 one for 50 bucks in junk yard,but defroster doesnt really blow much air..everything else does.

 

[east302]

Vent selection actuator is the one by the gas pedal. Going by memory, I think it controls three dampers in the box to control defrost, panel and floor vent distribution.

Look and see if the two linkages are intact. Also watch the silver notched dial as you change the vent position. It should rotate between the two lines imprinted on the actuator.

The other two actuators are for heater (behind ashtray) and recirc (above and behind blower).
Those don’t impact the defrost.

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[vendo]

I changed the blend door at gas pedal and still not working right..it stays on the floor mostly,gonna have to take it off and try to turn it by hand and see if i get defrost,in fla they probably never used it..

 

[east302]

Do the linkages move when you change the dial setting?


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[vendo]

im going to take it back off and test that today or tommorrow..can i move the heater box and see if that makes defrost go on?

 

[vendo]

rockauto just got in some GM heater controls for my yr truck for 149.00 with 40 core,mine has no lights on it...

 

[vendo]

nm that false alarm..bummer

 

[east302]

im going to take it back off and test that today or tommorrow..can i move the heater box and see if that makes defrost go on?

With the actuator in place, turn the panel dial from defrost to vent and see if the actuator linkages and/or the silver dial rotate. That would confirm that the panel is sending a signal to the actuator.

The silver dial should rotate between the two lines, smoothly without jumping back and forth.

If you have some movement from the dial, pull the connector and put a probe across the two pins. Rotate the panel dial and see what your voltage range is. It should change smoothly, not erratically.

If the actuator is removed, you should be able to manually rotate the dampers to check for air flow.


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[vendo]

i took the one off by the gas pedal i replaced and it doesnt move when changing the dials..i moved the heaterbox with a screwdriver and that moved ok..but im not sure if the middle one is suppoesed to make the defrost come on..

 

[vendo]

I have an adaptor for the newer ones..do they work? the one i had with the truck didnt turn on the A/C

 

[east302]

i took the one off by the gas pedal i replaced and it doesnt move when changing the dials..i moved the heaterbox with a screwdriver and that moved ok..but im not sure if the middle one is suppoesed to make the defrost come on..

My memory stinks since it’s been a while since I had the box opened, but I think the defrost damper is up high toward the back.

So, with the actuator installed and linkages in place, the notched dial does not turn or move at all?

If so, next step is to disconnect the connector and use a multimeter to probe the pins. Battery should be brown, so see if you get 12V from brown to black (ground) with ignition on. If not, check from brown to a chassis part.

Then check from the controller signal wire pin (white) to black and watch the voltage while the controller dial is turned. I don’t remember the range, but it’ll be noticeable.

See what you get there before junking the control panel.


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[east302]

I have an adaptor for the newer ones..do they work? the one i had with the truck didnt turn on the A/C

I’d get a Delco control if you go that route. I had a Dorman start smoking within minutes of installation and another reviewer on Amazon reported the same. Too, the dials are slightly smaller on the Dorman, giving a light ring around them at night.

No clue on how the 95 adapters work since mine are all 98 models. Others can probably give input on that.


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[east302]

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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[vendo]

I moved it with a screwdriver and i still didnt get defrost really,i will have to check the power connections

 

[vendo]

i have a oem one in there from the junkyard for a 95.

 

[vendo]

i got 10.8 volts and it moves to like 10.7 changing the dial..eng off..still no movement on accuator..what next..its a new style and all clicks on a/c etc but no defrost..would the middle one not working stop defrost..

 

[east302]

Just making sure, there are three wires right?

One is battery and should be around 12V. The next is the signal from the panel and should vary. The last one is ground.

So you have 12-ish on one and a steady 10V on the other when the dial is turned?


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[vendo]

it does sould different when i put defrost on but not a lot of air comes up