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 There should be a medium amount of resistance as it is withdrawn.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:
Manual Transmission and Clutch (Diagnosis and Testing)
Inspection and Verification
It is important to get an accurate description of the concern before
any diagnosis can be carried out.
Ask questions as to whether it occurs when hot or cold, during shifting,
driving at a particular speed or
in a parti ...
Driver and passenger airbags
WARNING: Never place your arm or any objects over an airbag
module. Placing your arm over a deploying airbag can result in
serious arm fractures or other injuries. Objects placed on or over the
airbag inflation area may cause those objects to be propelled by t ...
Removal
CAUTION: Suspension fasteners are critical parts because they affect
performance of vital
components and systems and their failure can result in major service expense. A
new part with
the same part number or an equivalent part must be installed, if installat ...
