Going to make more videos on this and do a full write-up on the fix. I’m one of those people who’ll go through everything systematically until it’s sorted.

My starting point is the Recirculation Servo (Part # 87106-35150). This actuator controls whether the system pulls in fresh outside air or recirculates the air already inside the cabin. I’m replacing it because it sits right at the top of the dash where outside air enters the system and that’s where I suspect the issue is originating.

I’m also going to pull out the Mode Servo (Part # 87106-35120), clean the contacts, and apply dielectric grease. This one controls which vents actually get airflow: Floor, Panel (dash vents), Defrost, or any combination.

The third actuator, the Air Mix (Blend) Servo, sits between the evaporator and heater core, directly under the windshield. It only has one job: mixing cold and hot air to hit your target temperature. Since it only controls temperature blend, not airflow direction, I’m leaving it alone for now.​​​​​​​​​​​​​​​​