Denied waterpump replacement

[Hershey]

Here's the new hot level from earlier ( 40+ mis. & 30 degrees ) . The other from last night ( 90+ mis. + 42 degrees ) . The other pic is the cold level before leaving earlier today . Should there be such a drop in the Hot level ? Could the difference in the temps and miles traveled make for the drop between the 2 Hot levels ? Air pockets being expelled from the system as well ? I guess time will tell .