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Message: <blockquote data-quote="ORVietVet" data-source="post: 24849" data-attributes="member: 9438">I work as a part time service writer at my friend's shop in Junction City, Oregon. He is a specialist in so many fields and has done work on this Tahoe before. He used his Snap On gauges and reported to me what the readings were. No charge for the inspection. It was working when he inspected.This morning she came in at 9 a.m. and I cleared the codes in the system. She did not use the a/c to get to shop. Was still in the low 60's. B0408 and B0418. I then did a re-calibrate on it.Shut the engine off. Moved the manual temp controls up from bottom to about 3/4" up. Turned fan speed switch to 3. Removed the 10 amp HVAC/ECAS fuse, from the under hood fuse/relay box, for 1 minute. Put the fuse back in and then started the truck and let run for 2 minutes. Shut truck off. Let the truck sit for about 15-20 seconds and then restarted. Then something strange happened that had never happened before during this ordeal she has been having. Instead of having either all cold out of all four vents of the D/S and P/S, it blew cold on D/S and hot on P/S. No matter what I did by shutting off the system and shutting off engine, on a restart and set for a/c to work, it blew cold on D/S and warm on P/S.Then I did the re-calibrate again and we got surprised again. Everything worked as is intended. Blew cold when commanded to and warm when commanded to and was same for both the D/S and the P/S. In other words, it acted like there was never a problem. She drove home and the a/c worked great the whole way. She is gonna monitor it during the day because she will be using the a/c today in 90 degree weather.</blockquote>