My truck has great heat on passenger side, but Luke warm on driver side, and blows slower on driver side as well. I had it taken to a dealer service center, they ran the diagnostics and said everything was working fine, they only saw a 3 degree difference in temps in both sides. (Which in my opinion, luke warm air is not normal when passenger side will burn your hand if you hold it there long enough). They said it was normal where the core was further away from the driver side vents. They found no issues with blend door, actuators and all of that, even said heater core was fine. I went ahead and back flushed, the core just to see if it had any change, but not much of difference any ideas?
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