Answer to "Engine fan stays on, when using the AC on a hot day."In my 2001 mack e7 460, I have had two issues in regards to this. First and my guess is they overcharged it. My mechanic has done this and mack drained and filled properly and no more problems. Secondly on the mack system there is a relay that is mounted near the compressor. It was not fixed in place properly allowing to fill with water. When this happened the fan would be on off momentarily or always on. Replacing relay and keeping it dry by properly mounting no more issues.
Answer to "Anybody else using a MicroBlue Treated Transmission?"I purchased two years ago. I gained well over half mpg but swapped tires and in frame same time. I had a problem and other than taking a load to n.c. They took excellent care of me and very satisfied with customer service. I bout a 13 speed treated and rebuilt by them for 6k plus shipping. The biggest thing I noticed is a 20 degree drop in my tranny temp.