my heater is stuck in full heat mode & Will reset after vehicle is turned off on 2001 GMC Yukon

my heater is stuck in full heat mode & Will reset after vehicle is turned off

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1 answer
Sounds like problem with blendoor actuator behind dash. First though I'd disconnect battery for 10 minutes and maybe all will reset. Had problem on my 2006 ford fusion- would not blow thru panel vents but was fixed after reboot.