We purchased our ACE new from the Dealer in 2012 and so far I have never had to touch our dash A/C . Looking at the Tempcon manual hyperlink, I see the 1.75 lb charge does not even show up for the F53 chassis selections and is low compared to what is specified. Not sure it is even the correct manual for our coach A/C fitment. It was the first manual I could find. You might try contacting Thor or Evans Tempcon directly to see if either can confirm the freon charge requirement for the 2012 build year (2013 coach). Maybe another ACE owner in another close by build year can advise what their evaporator box charge value is, just to see if there is a different value?
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