For a few months my Tahoe will not blow hot air, even after running car for a while. Then, yesterday I noticed that the engine was heating up at high speeds. When I slowed down or stopped, it would cool back down just under half-way on the gage.
SOURCE: 2000 Chevy Tahoe A/C started blowing fog & no longer cools good
Have you checked yoour heater core? I agree it is possible that your evap might have sprung a leak. Have you physically checked your A/C compressor to see if your cluth is coming on?
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