I hope that's all it is, it's a freaking inferno driving a black E320 that's been sitting in the 100 degree sun all day...Thanks for the test results. I am just wondering if you have enough refrigerant in the system. You may have very little in liquid form. I would add a can (12 ounce) of refrigerant (you can get from WM for $4, if you have the piercing adapter) and see what happens to the readings. Make sure you PURGE the air from the manifold hoses by releasing some refrigerant from the charging side prior to charge.
Yeah, I did notice air trapped in the hose between the manifold and couplers when putting it away.
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