What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[gooffeyguy]

Ordered.

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[George B]

I have a question for the tech2 owners here. When using the special functions to command heat or cool in the aux heater I noted that when I command heat it gets colder and when I command cool it gets warmer. Is this a fluke with the tech2?

Both HVAC units operate as expected except that the rear tends to blow slightly cooler air and there is some air leaking in the vents on the roof when it blowing to the floor in auto/heat.

 

[George B]

I have a question for the tech2 owners here. When using the special functions to command heat or cool in the aux heater I noted that when I command heat it gets colder and when I command cool it gets warmer. Is this a fluke with the tech2?

Both HVAC units operate as expected except that the rear tends to blow slightly cooler air and there is some air leaking in the vents on the roof when it blowing to the floor in auto/heat.

@swathdiver

 

[George B]

I have a mig welder. It can do aluminum if I bought an aluminum spool gun for it. Aluminum wire is too soft to feed correctly down the entire line to the gun, so they make guns with a spool attached to feed the wire.

Tig is nicer, more precision and control though.

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I have a tig/stic welder but never really messed with the tig operation mutch. Would like a pedal and a auto darkening helmet. For most shop work a good mig with gas shielding would be best.

 

[swathdiver]

I have a question for the tech2 owners here. When using the special functions to command heat or cool in the aux heater I noted that when I command heat it gets colder and when I command cool it gets warmer. Is this a fluke with the tech2?

Both HVAC units operate as expected except that the rear tends to blow slightly cooler air and there is some air leaking in the vents on the roof when it blowing to the floor in auto/heat.

That would seem to me that the wrong actuators are installed. This is what ours did when I put the wrong one in on the driver's side.

 

[swathdiver]

Im thinking my gauge display is completely toast now... I fixed it a long time ago, but it looks super dead this time.

View attachment 265729

There's a guy on youtube that breathes new life into burned out clusters.

 

[George B]

That would seem to me that the wrong actuators are installed. This is what ours did when I put the wrong one in on the driver's side.

The strange thing is the rear heater works as it should. When using the vehicle controls heat is heat and cool is cool just like it should be.

 

[George B]

The strange thing is the rear heater works as it should. When using the vehicle controls heat is heat and cool is cool just like it should be.

@swathdiver if you get a chance can you check yours for comparison?

 

[swathdiver]

@swathdiver if you get a chance can you check yours for comparison?

Ok, I'll check it tomorrow.

 

[Doubeleive]

@swathdiver if you get a chance can you check yours for comparison?

I have been in the back with the panels off and my tech2 in hand it worked as commanded with the tech2, there are only 2 actuators in the rear. the one nearest the rear blower motor controls hot/cold and the one further up at the Y in the vents controls air up/down, you can put in the wrong actuator it will fit, plug in and everything, it just will not work right (i know because I tried it lol). so assuming you have the correct actuators in there it could something else like a bad control module or faulty sensor in the vent, there are 2 thermistors in the same rear vent area where the actuators are, they should have 5volts power at the harness and the sensor should change resistance when heat is applied (like from a hair dryer or heat gun), it's unlikely one of them would be bad but if you are in there may as check them to rule it out.