The following technical tips provide repair information about
specific conditions on a variety of vehicles. If you have a tough or unusual service
repair, the TSS Technical Assistance Hot Line can help. Call 1-800-825-5886,
prompt #2, to
speak with a technical expert with the latest OEM information.
Accessory
Drive Belt Whine
2001-02
Chevrolet Tahoe, Suburban; 2001-02 GMC Yukon, Yukon XL, Yukon Denali, Yukon XL
Denali
A whining-type
noise may be heard in the passenger compartment when the vehicle is idling and
may vary in pitch as engine RPM is increased.
The
noise may be caused by the power steering pump pulley positioned too far
inboard of the power steering pump.
Inspect
the power steering pump pulley for proper positioning on the power steering
pump shaft. If it is determined that the pulley is not even/flush with the end
of the shaft (+/- 0.25 mm; 0.010 in.), follow the appropriate Service
Information to reposition the power steering pump pulley. (Fig. 18)
Grunt
Noise While Turning
1999-2001
Ford Windstar
Some
vehicles equipped with a 3.8L engine may exhibit a "grunt" noise -- a
low, loud, rumbling hydraulic noise and shudder -- while turning the steering
wheel. This may be caused by the original design power steering hose or by air
trapped in the power steering system after hose replacement.
Replace
the power
steering pressure hose with service hose YF2Z-3A719-AA to correct
the noise. This service hose includes a pulse suppressor that requires all air
to be removed during fluid fill of the system. Refer to the appropriate Service
Information for removal and installation details.
Replacing
the power steering pump or gear will not result in correction of the grunt
noise.
The
service hose is intended to correct the grunt noise only. Do not use this
service hose to repair any other power steering condition.
Any
air left in the system will result in continuation of the grunt noise as well
as other noises. Refer to the power steering system fill procedure in the
appropriate Service Information.
It
may take several times of performing the evacuation procedure to remove all of
the air from the system. Be sure to pull over 68 kpa (20 in/hg) on the gauge
with the engine running while evacuating the system.
One
way to check for air in the system after the evacuation process is to mark the
fluid level on the power steering reservoir prior to starting the engine. If
the fluid level drops when the engine is started, there is still air in the
system. Repeat the bleed process until there is no fluid level drop evident in
the reservoir.
An
additional way to check for air in the system is to install the vacuum pump on
the reservoir, start the engine, but do not turn the steering wheel, then
slowly pull vacuum to between 68-85 kpa (20-25 in/hg). If there is still air in
the system the pump will moan before reaching 68 kpa (20 in/hg). If this
moaning is heard, repeat the bleed procedure until reaching 68-86 kpa (20-25
in/hg) with no moan noise.
"No
Cap" Fuel Filler System
Ford
vehicles with the Easy Fuelâ„¢ fuel filler system
The
Easy Fuel "no cap" fuel filler system eliminates the need for a fuel filler cap.
The spring loaded fuel door is held closed by two latches that can only be
released by a standard size unleaded fuel nozzle, or the special plastic funnel
included with the vehicle.
A
flexible rubber seal, attached to the outer fuel filler door, seals the fuel
filler. If the seal becomes damaged, it must be replaced to prevent possible
contamination of the fuel tank.
In
the event fuel needs to be added from a portable fuel container, it's necessary
to use the white plastic funnel included with the vehicle. It is the same
diameter as an unleaded fuel nozzle. Fully insert the funnel into the fuel
filler neck to add fuel from a portable container.
Do
not insert the nozzle of a portable fuel container or aftermarket funnel.
Audio
System Noise When using Portable Playback Devices
2010
and prior GM passenger cars and trucks, including Saturn; 2010 and prior HUMMER
H2, H3; 2005-2009 Saab 9-7X
Some
portable audio equipment may be susceptible to certain types of electronic
noise present in the vehicle's 12V power outlet.
Here
are two ways to eliminate this type of interference:
·
If the audio device is
capable of being self-powered (battery), use it that way instead of plugging it
into the vehicle's power outlet.
·
Have the customer purchase
a Ground Loop Isolator. This device plugs in between the radio and the audio
device.
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