When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I've got an MSLabs MS3 Basic that I've configured AC Idle up on after finally figuring out my wiring issues. It works okay-ish in the sense that it does not keep idle perfectly steady but does a good enough job to make the car feel normal. However, I have found one very odd exception to this: Whenever I switch the blower to setting 3 WITH the AC on, the car stutters hard. It happens when going from 2->3 or from 4->3. I've looked over the wiring diagram and am at a loss as to what could cause such a specific issue aside form just a huge increase in load on the blower motor. I've attached a wiring diagram of the circuit for reference: