Hello, Still pending some pressure readings on the '89 Sundance I posted about earlier, but now have a question about the system on my '85 Reliant. This car has proven to have a few attributes that are different from my Daytona and the Sundance (such as the early Bosch TBI unit). Anyway, decided to completely replace almost everything in the A/C system, if for no other reason than it'll be less [I should have my mouth washed out with soap for using such terms]-pain and will look cleaner/better. That said, looking for info on the following parts which are different from all the other cars on which I've done R134 conversions. First, while the expansion valve is very typical and has the usual 2-prong low-pressure cutoff switch mounted on the driver side, there is also what the parts manual calls a "SWITCH & LUBE PKG., A/C Suction Line Temp. Sensing or Cycling" screwed to the side as well. Mopar part number 4339411. Looks like this: The copper probe slides into a "well" on the suction line a few inches from the expansion valve. On the existing setup, the probe looks like it simply slides into the well and just sits there. There is some grease/paste present, but after 35 years could just be crud. So, does the probe simply slide in the well and sit there? Any dielectric grease or similar needed? Also, what does this actually do? From the part name it senses temp, but what for? Haven't seen this before and want to set it up correctly. Furthermore, while I'm building my parts list, both the parts manual and the Rock Auto website show a high-pressure cutoff switch. Mopar part number is 3848674. Looks like this: This part apparently threads inline someplace, but just looked at the car again and I don't have this any place on the system. Interestingly, the parts manual shows this part under the exact same numbered part on the diagram as the low-pressure switch: The illustration is obviously the low-pressure cutoff. So does this mean the car has either one or the other? I sure as heck don't have the pictured high-pressure switch. I like to replace everything possible on these retrofits. New parts are clean and provide piece of mind. Thanks for any advice/info!