Great links thanks I saved them.

When they say "bad center vent" what does that mean?
I have noticed that I do not get any warm air out of the middle vents at all -- only cold air even though the heat is on. Is this what they are referencing? Also even when the CCU is turned to OFF, I get air coming from the vents, but its not from the blower motor. Is that normal?

5.5 hours total to do the job isn't as bad as I thought. I heard from someone its a 12 hour job and I cringed...

I have a vac pump that works great for getting everything out the system. Thanks dhjenkins for the oil information, good thing you mentioned that.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k