I have auto climate control and recently when it cycles the heat on the sound and feel of the engine will change. I can only feel and hear it at idle of course. I feel it in my seat and in my foot while holding the break. The tone of my exhuast will change as well. Any ideas? Is this normal or what? I don't think i noticed this problem last winter. I recently added an exhaust, CAI and a tuner. I was using the canned tunes for awhile (still waiting on troyers customs). I don't think any of this should affect this.

 

I notice it... more load is placed on the engine. It sounds louder because the engine is working harder

 

i am pretty sure it did it last winter you just may not have noticed its just more noticeable now with your exhaust and intake

after my exhaust now changing climate control setting is more noticeable through the motor