Noticed that when i turn the truck off the HAVC temp setting resets to 22 deg , owners manual said it should recall temp you set it at .Not sure if its related but in cold weather it takes along time to heat up and put heat in cab , when its hot out temp gage goes up to normal within 5 mins and A/C is intermittent, but truck will not over heat (assuming stat is stuck open ) with the heater control when you do shut truck off and start again and temp is where you left it for A/C , A/C works awesome . no check engine light cooling fans works as intended . ?? cheers .