FORD 2009 F-550 v.3 - Manual (Page 25)

Transmission fluid temperature gauge (automatic transmission
only): If the gauge is in the:
Normal area– the transmission
fluid is within the normal operating
temperature (between “H” and “C”).
Yellow area– the transmission fluid
is higher than normal operating
temperature. This can be caused by
special operating conditions (i.e.
snowplowing, towing or off road
use). Refer to Special Operating
Conditions in the scheduled
maintenance information for
instructions. Operating the transmission for extended periods of time
with the gauge in the yellow area may cause internal transmission
damage.
Altering the severity of the operating conditions is recommended to
lower the transmission temperature into the normal range.
Red area– the transmission fluid is
overheating. Stop the vehicle to
allow the temperature to return to
normal range.
If the gauge is operating in the Yellow or Red area, stop the vehicle and
verify the airflow is not restricted such as snow or debris blocking airflow
through the grill. If the gauge continues to show high temperatures, see
your authorized dealer.
2009 F-250/350/450/550 (f23)
Owners Guide, 3rd Printing
USA (fus)
Instrument Cluster
25