Its at every setting, not just on high. Thats whats leaving me to believe its the blend door. Yeah mopar engineers get me wondering about alot of what they do, for instance, replacing a classic and GREAT 4.0 I6 Jeep engine for a Friggin minivan motor. The new jeeps are growing on me, but i wont get one unless they offer the HEMI engine. Ive heard talks about it, and their considering it. Just waiting on them to figure out if they wanna throw another $h!t engine at the wrangler, or put something GREAT into them. i would buy one tonight if they came out with a Hemi Wrangler!