Once or twice a year I add some R134 charge to our dash air unit in our coach. It loses some pressure and cooling peformance over time but is not a significant enough loss to require repair. I have a set of gauges and my system coupling points are by the compressor in the back but yours may vary. I typically used a sheet of paper with readings I was shooting for based on the ambient outside temperature. Usually the paper would not be handy or try and blow away. I took a scrap piece of plastic (leftover plastic wainscot from Lowes) and used a sharpie to post this near the compressor and it has proved to be handy. I had added some aluminum thin diamond plate earlier just to have a place to post and mount things on. I also have my fluid type/brands, dates of changeover to synthetics, and mileage here for the last change. Just do not want any service folks to add different fluid types if I need road service. These air system pressure values are for the R134 high pressure side with good air flow (fans on) over the condenser. Thought these values might be handy for someone else also. It takes about 15 minutes once or twice a year to peak the system back up. Use the outside ambient temp to get the high side pressure values. There is a nominal and high spec pressure value for a given ambient on the table. Any ending high side pressure value between those two numbers should be fine. Always add charge to the low side port only.
I added one shot of the coach after a wash...There may have been things that Beaver did that we would have changed given the chance but one thing they did right was the paint jobs. My coach is about 12 years old now, is on the road all summer, and after cleaning it up I still marvel at the finish. For its size it is quite remarkable. Except for some peeling clearcoat at the roof curves the rest is doing well....kudos to the Beaver Paint booth guys.
Later Ed
