Has anyone experienced significant parasitic draw coming off the 10A HVAC/ECS fuse? Causes?

I haven't had a chance to fully run down the root cause but definitely know that this is pulling significant power constantly. I recently replaced a bad climate control with a Dorman unit that seemed to drop in and function perfectly but I am reading these may have issues not shutting down.

Anyway, figure I would check with the powers that be before sinking further time in. Narrow the focus...

Thanks