Ford Mustang (1999-2004) Service Manual: Index Card
Place an index card or a piece of paper between the weatherstrip and the sealing surface, then close the door. Slowly withdraw the index card or paper after the door is closed and check the amount of pressure on the weatherstrip. There should be a medium amount of resistance as it is withdrawn.
Continue around the entire seal area. If there is little or no resistance, this indicates insufficient contact to form a good seal. At these points, the door, the glass, or the weatherstrip is out of alignment.

Tracing Powder
Tracing powder is used to check both the uniformity of contact and the
tension of a seal against its
sealing surface. These tests are usually done when a suspected air leak/noise
appears to originat ...
Noise, Vibration and Harshness (NVH) (Diagnosis and Testing)
Special Tool(s)
ChassisEAR
107-R2102 or equivalent
Electronic Vibration Analyzer
100-F027 (014-00344) or
equivalent
EngineEAR
107-R2100 or equivalent
...
Other materials:
Driving Aids
STEERING
Electric Power Steering
WARNING: The electric power steering system has diagnostic
checks that continuously monitor the system to ensure proper
operation. When a system error is detected a steering message will
appear in the information display.
WARNI ...
Door - Air Inlet Duct
Removal
1. Remove the evaporator core housing. For additional information, refer to
Section.
2. Disconnect the vacuum line.
3. Remove the screws and remove the duct.
Installation
1. To install, reverse the removal procedure.
...
Actuator - Door Lock
Removal
1. Remove the door trim panel (23942). For additional information,
refer to Section.
2. Remove the door latch (21812). For additional information, refer to
Latch-Door .
3. Remove the door ajar switch.
Release the locking tab.
4 ...
