[77newell]

I'm confused by the hardware I've found in my dash air system. There is an inline reservoir between the condenser and evaporator coils. This location is used with a thermal expansion valve on the inlet of the evaporator. I cannot find a thermal expansion valve. I do have a 1" metal cube plumbed into the tubing between reservoir and the evaporator, I'm guessing it is some kind of orifice restrictor. However, with orifice restrictors the reservoir in the system is between the evaporator and compressor to prevent liquid refrigerant from getting to the compressor and damaging it. I cannot find such a reservoir, nor can I find any documentation anywhere of a system designed with two reservoirs. You one either upstream or downstream of the evaporator but not both. So fundamentally I'm seeing a system that doesn't align with standard documented designs and is a functional mystery.

I also cannot find any pressure switches anywhere in the refrigerant flow. If there are none, then the compressor runs continuously whenever the system is turned on regardless of the fans on the evaporator being either in high or low speed. I just cannot imagine how such a simply constructed system can function much at all. I may be missing something and need to spend even more time under the coach sussing things out, but I seriously doubt it.

Do any of you have insight into this 93 version of this system?