haha yeah it's not a procedure I'm looking forward to, per se, but I love the idea of replacing it all since I don't have enough history on the vehicle, then I can comfortably trust the reliability. And I really appreciate that! I will definitely keep you in mind!

 

I studied HVAC. So sure there may be multiple sensors unsure what GM has (have to check my truck - you already checked yours though

If hvac isn't your strong suite, BEFORE EVEN THINKING about answering. Why are you here?

1) why are you testing the sensor? how did you determine this part might be effecting hvac cooling?

2) why are you asking if there's two? did you test the one you found and is it good

3) are you doing this safely

I don't have GM shop man (unsure if its' worth buying).

TEST: you could pressurize the system with nitrogen and see if the switch goes high. or if you have access to dealer tools fill system run, test, then evacuate. IF THE SYSTEM IS CLEAN you can (otherwise you may be goofing your dealer's expensive system). pressurizing for testing is dangerous - if you forget or what it can sent parts flying at high speed.

and for that reason: i gotta say. if they are cheap buy it don't test. BUT BEFORE THAT. don't go replacing parts until you are comfortable with your HVAC knowlege and know that THE ONLY THINK THAT COULD BE MAKING THE SYSTEM FAIL is the part, and that you've actually bench tested the part and it failed the test.

(you see, i'm suspicious about that part being responsible and not something else)

 

If hvac isn't your strong suite, BEFORE EVEN THINKING about answering. Why are you here? - I suppose my thought was that a forum was a group of people who could congregate to share information for purposes of learning. Did you mean something else by "why I'm here"?

why are you testing the sensor? how did you determine this part might be effecting hvac cooling? why are you asking if there's two? - I'm not testing the sensor. I was under the impression that there are typically 3 switches: hi pressure switch, low pressure switch, and and clutch switch. As I was perusing the available part options for these switches on Rockauto, due to the way they labeled/described some of the switches (somewhat ambiguously, I might add) it left me confused not understanding why there seemed to be 2 high pressure switches. As previously stated, the true identity of these 2 switches seems to have been uncovered, though I will need to trace the wires to know with absolute certainty but according to my FSM, the wire (dark blue) goes to the C2 connector under the electrical center in pin A3, making me believe that this is doing exactly what I think it is doing.

As for testing, I have no interest in testing a $25-$40 part, I'll just replace it because the time it would take to carry out a proper test for it is worth more than the cost of the part, particularly in the Texas summer heat. So as stated, I'm just going to replace the entire AC system, every part. It's cost effective and will leave little doubt as to the functioning of the components.

 

make sure you examine the parts to try and learn why it failed to avoid if possible the same failure in the future. cuz no'in is one half, of the battle.

 

I imagine there was a leak in the system somewhere. I've since replaced every component, sensor and line in the truck, so it has a 100% new AC system. If there was an issue haunting it, it's gone now lol