I have a Cforce 500 new.  Only 10 hours on it. Maybe 70 miles.  It makes a whining noise when driving.  my 600 doesn't make this noise.  Is it normal for the 500

How hot is OK.  I have a Cforce 500,  and it always seems to run hot.  Not just from the exhaust, but on the display.  It seems to always run at top or second to top bar on display.  I have a 600 that always runs at 2 bars.  What does the 500 run at?