1. OK in the automotive, the filter drier is also a receiver. Just wondering then where will they put the desiccant though. In the fixed HVAC system, the liquid receiver is used to receive the liquid refrigerant when you are pumping down the system for repairs. So I think to call that small filter with sight glass installed in the liquid line of your automotive air conditioning system is misnomer.

2. Now, we come to the refrigerant flow regulator. You stated that in the variable orifice tube, it is controlled by a temperature sensing device, meaning a feeler bulb? well, if this is so, that means you are regulating the flow by controlling the orifice opening which is in turn controlled by a sensing bulb. this is the principle of operation of the expansion valve. In the fixed orifice, you said it is just a restriction for the liquid refrigerant. Have you noticed the capillary tube? and by the way, the refrigerant flow controls fixed or variable opening, does not change the state of the refrigerant. It expands them hence the term, "adiabatic expansion".

3. again you have stated the suction pressure of 27 to 35 psig. I am asking at what rpm of the engine should yo base this reading since this is a very big different from our fixed HVAC system you mentioned. and by the way, I also operate, repair and maintain open type compressor system wherein the compressor is driver by belts just like in the automotive system. the only difference is that, the rpm is somewhat constant and the compressor has various unloader system.

And I do not insinuate that the engine is running when I mentioned that when I attach the gauges, the readings is such. Now, question to you. when you attach the gauges to their respective ports, is the engine running or not? That is why I am asking the guy to indicate the rpm since he did not mentioned it likewise to you.

Now, this is an open exchange of ideas wherein we may learn from each other. You are an expert in your trade I presume, so let's learn together. I nearly have the experience to be a trainor in HVAC system in ARAMCO ITC but I declined the offer. You, on the other hand, is an experienced teacher.