Air Pressure Checks
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 Lincoln Navigator, 2002 Ford Expedition, 2001 Lincoln Navigator, 2001 Ford RV Cutaway, and 2001 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- A "No Drive" condition can exist, even with correct transmission fluid pressure, due to inoperative clutches or bands. Inoperative components can be located by substituting air pressure for fluid pressure to determine location of malfunction. To check component, drain transmission fluid. Remove oil pan, filter, seal assembly, solenoid body and valve body.
- Forward, coast, low/reverse, overdrive, direct and intermediate clutch operation may be checked as follows: Using shop air, apply air to proper points. See Fig 1. A dull thud can be heard when clutch piston is applied. If no thud is heard, movement of piston can be felt by placing finger tips on input shell. If seals are leaking, a hissing sound will be heard.
- If clutches fail to operate during air check, inspect for plugged fluid passages in case, improperly seated, damaged or incorrectly installed piston seals, plugged feed holes for clutch apply in case and/or clutch cylinder, damaged piston and/or clutch cylinder. Repair as necessary and retest.