I had something similar happen on another
gm product. It was an issue with the vacuum which caused the blower to put out ONLY hot air.
Take your truck to Great Neck RD heading north over the bridge. Go fast. When you get to the top, take your foot off the gas and coast all the way to the light. Your truck will pull vacuum and may fix the problem.
I know it sounds wierd, but it worked for me on the old Tahoe.
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"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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