Automatic Transmission Fluid - Ford Grand Marquis Owner's Manual

If you must check the power steering fluid when
it is cold, make sure that the fluid reaches the
MIN mark on the reservoir.

Automatic Transmission Fluid

Under normal circumstances, you do not need to
check the fluid level of the transmission, since
your vehicle does not use up transmission fluid.
Refer to the Maintenance Schedule booklet for
replacement intervals. However, if the
transmission is not working properly — for
instance, the transmission may slip or shift
slowly, or you may notice some sign of fluid
leakage — the fluid level should be checked.
Checking the Automatic Transmission
Fluid
It is preferable to check the transmission fluid
level at normal operating temperature
150˚F-170˚F (66˚C-77˚C), after approximately 20
miles (30 km) of driving. However, if necessary,
you can check the fluid level without having to
drive 20 miles (30 km) to obtain a normal
operating temperature if outside temperatures
are above 50˚F (10˚C).
With the vehicle on a level surface, start the
engine and, while fully applying the brake
pedal, move the transmission shift selector
through all of the gear ranges allowing sufficient
time for each position to engage. Securely latch
the transmission shift selector in the P (Park)
position, fully set the parking brake and leave
the engine running.
NOTE: Your vehicle should not be driven if
the fluid level is below the bottom
hole on the dipstick.
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