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03-05-2
Drive BeHs, Accessory
03-05-2
DESCRIPTION AND OPERATION (Continued)
Rattling noise with A
I
C on can be caused by the
following:
•
Automatic drive belt tensioner hitting the stops:
Check wear indicator marks on drive belt tensioner
and make sure drive belt is not worn and correct
length drive belt is installed. Replace drive belt as
required.
•
Excessive drive belt rideout: Although rare, the
drive belt groove depth may vary enough to cause
excessive drive belt tensioner actions. Try replacing
the drive belt with a new drive belt.
Sharp metallic click with a chirp when A I C
compressor clutch is engaged:
•
The click is caused by the A
I
C compressor clutch
engagement and should be considered normal.
•
This click is sometimes accompanied by a clutch
chirp. This should also be considered normal and
not confused with drive belt chirp.
Loud drone or moan while turning the wheels:
•
This is usually an indication of low power steering
fluid.
•
Check and refill the power steering fluid as required.
Muted ticking noise on cold weather start:
•
This can sometimes be heard with the hood
{ 166 1 2) open during a cold start.
•
It is caused by the drive belt label making contact
with the backside of the pulleys and should be
considered normal.
NOTE: The V-ribbed drive belt is dependent on friction
to deliver power to a pulley. If the horsepower load of
the accessories exceeds the drive belt frictional
capability, a loud, continuous drive belt squeal will
result.
The frictional capability of the drive belt will be
compromised if:
•
the drive belt tension is below specification.
•
there is any type of lubrication or belt dressing on
the drive belt.
Do not use any type of belt dressing, silicone spray or
rubber conditioner on a V-ribbed drive belt.
The use of a lubricant may temporarily silence a
squealing drive belt, but it does so by allowing the
drive belt to slip in the pulleys. The squeal will
eventually return and the drive belt will often be:
•
glazed.
•
damaged or destroyed.
NOTE: If the accessory drive system has been
contaminated, all pulleys should be cleaned with a
suitable solvent before installing a new drive belt.
Pulleys will also become contaminated by the lubricant
and then will contaminate the replacement drive belt,
reducing its frictional capability.
CAUTION: If drive belt chirp is present, determine
the cause and correct it.
Do
not use any type of
lubricant on the drive belt.
NOTE: V-ribbed serpentine drive belts are sensitive to
pulley alignment.
If
a pulley is not in the same plane as
the others, the drive belt may exhibit a periodic chirp.
Sometimes a chirp will occur in a system that is
perfectly aligned.
Removing and installing the same drive belt will often
correct drive belt chirp permanently. Regardless of
how the chirp is corrected, the vehicle should be
allowed to idle for approximately 20 minutes with the
accessories loaded down {headlamps, A
I
C system
and other accessories, turned on). Recheck to make
sure the chirp is corrected.
NOTE: Water also acts as a lubricant but quickly
evaporates. A vehicle just out of a car wash may
exhibit drive belt squeal for a short period of time while
the drive belt dries out. This is normal but the
accessory load should be reduced {turn OFF AIC
system and minimize power steering effort) until drive
belt dries. This will prevent the drive belt from
becoming glazed or damaged.
NOTE: Squirting water {in small amounts) on the
grooves of a noisy drive belt should temporarily
change, reduce or eliminate the noise.
Using a squirt bottle or equivalent, squirt the grooves
of the noisy drive belt.
If the water has no effect on the noise, the condition is
being caused by something other than that drive belt.
NOTE: Incorrect drive belt installation may cause chirp
or squeal.
Other possible causes of drive belt chirp include the
following:
•
idler
I
tensioner pulley bearings
•
A
I
C compressor clutch {during engagement)
•
accessory bearings
Other possible causes of drive belt squeal include the
following:
•
idler
I
tensioner pulley bearings
•
accessory bearings
Check the drive belts for proper routing, seating and
for wear. Refer to the illustrations in Removal and
Installation.
CAUTION: Incorrect drive belt installation will
cause excessive drive belt wear and may cause
the drive belt to come off the drive pulleys.
Check the drive belts and pulleys for contamination,
antifreeze, belt dressing, undercoating or other
possible causes.
•
Antifreeze contamination: A thorough rinsing of
belts and pulleys with clean water should restore
the frictional capability of the drive belts.
•
Other contaminants: Remove and discard drive belt.
Clean all pulleys with a suitable solvent and install a
new drive belt.
1997 Thunderbird, Cougar July 1 996
Содержание Thunderbird
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