Ford 2003 Mustang Workshop Manual page 77

Automatic
transmission buzz or
hiss
Manual Transmission
Clutch throw-out
bearing whine. A
change in noise pitch
or loudness while
depressing the clutch
pedal
Heating, vacuum and
air conditioning
(HVAC) system chirp
— most audible inside
the vehicle. Listen for
a change in noise
pitch or loudness
while changing the
HVAC system blower
speed
Air conditioning (A/C)
clutch ticking —
occurs when the
compressor clutch
engages
Intermittent rattle, or
scraping/rubbing
noise
Engine ticking or
knocking noise —
occurs during idle or
Vehicles with a
plastic intake
manifold.
Incorrect
driveline
angles.
Worn or
damaged main
control
solenoids or
valves.
Worn throw-out
bearing.
Damaged or
worn HVAC
blower bearing.
Acceptable
noise.
Incorrect air
gap.
Loose exhaust
heat shield(s).
Wiring, hose or
other part
interfering with
accessory drive
belt or pulley.
Piston noise or
valvetrain noise
(bled down
port. DISCARD the leaking
parts, and INSTALL a new
component.
Acceptable condition. Some
plastic manifolds exhibit this
noise, which is the effect of
the plastic manifold.
CHECK for correct driveline
angles. REPAIR as
necessary. REFER to
Section 205-00 .
Using a transmission tester,
activate the solenoids to
duplicate sound. INSTALL
new components as
necessary. REFER to
Section 307-01 .
INSTALL a new throw-out
bearing. REFER to Section
308-01 .
INSTALL a new blower
motor. REFER to Section
412-02 .
LISTEN to the clutch to
determine if the noise occurs
with clutch engagement. A
small amount of noise is
acceptable. If the noise is
excessive, CHECK the A/C
clutch air gap. INSPECT the
A/C clutch for wear or
damage. INSTALL a new
clutch as necessary. REFER
to Section 412-03 .
INSPECT the exhaust
system for loose parts using
a glove or clamps to verify
cause. REPAIR as
necessary. REFER to
Section 309-00 .
INSPECT accessory drive
system closely verifying
there is adequate clearance
to all rotating components.
REPAIR as necessary.
Go To Pinpoint Test G .