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Cadillac Tech

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Document ID: 2047004 <HR>
#05-03-10-020A: Use of Nitrogen Gas in Tires - (Jan 3, 2008)






<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Use of Nitrogen Gas in Tires</TD></TR></TBODY></TABLE>​






<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2008 and Prior GM Passenger Cars and Trucks (including Saturn)</TD></TR></TBODY></TABLE>​

<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2008 and Prior HUMMER H2, H3</TD></TR></TBODY></TABLE>​

<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2008 and Prior Saab 9-7X</TD></TR></TBODY></TABLE>​














<HR>This bulletin is being revised to add the 2007-2008 model years. Please discard Corporate Bulletin Number 05-03-10-020 (Section 03 -- Suspension).





<HR><A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2047004&from=sm#ss1-2047004">GM's Position on the Use of Nitrogen Gas in Tires

General Motors does not oppose the use of purified nitrogen as an inflation gas for tires. We expect the theoretical benefits to be reduced in practical use due to the lack of an existing infrastructure to continuously facilitate inflating tires with nearly pure nitrogen. Even occasional inflation with compressed atmospheric air will negate many of the theoretical benefits. Given those theoretical benefits, practical limitations, and the robust design of GM original equipment TPC tires, the realized benefits to our customer of inflating their tires with purified nitrogen are expected to be minimal.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2047004&from=sm#ss2-2047004">The Promise of Nitrogen: Under Controlled Conditions

Recently, nitrogen gas (for use in inflating tires) has become available to the general consumer through some retailers. The use of nitrogen gas to inflate tires is a technology used in automobile racing. The following benefits under controlled conditions are attributed to nitrogen gas and its unique properties:​

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>A reduction in the expected loss of Tire Pressure over time.</TD></TR></TBODY></TABLE>​

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>A reduction in the variance of Tire Pressures with temperature changes due to reduction of water vapor concentration.</TD></TR></TBODY></TABLE>​

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>A reduction of long term rubber degradation due to a decrease in oxygen concentrations.</TD></TR></TBODY></TABLE>​





<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>Important: These are obtainable performance improvements when relatively pure nitrogen gas is used to inflate tires under controlled conditions. </TD></TR></TBODY></TABLE>​






Nitrogen inflation can provide some benefit by reducing gas migration (pressure loss) at the molecular level through the tire structure. NHTSA (National Highway Traffic Safety Administration) has stated that the inflation pressure loss of tires can be up to 5% a month. Nitrogen molecules are larger than oxygen molecules and, therefore, are less prone to "seeping" through the tire casing. The actual obtainable benefits of nitrogen vary, based on the physical construction and the materials used in the manufacturing of the tire being inflated.
Another potential benefit of nitrogen is the reduced oxidation of tire components. Research has demonstrated that oxygen consumed in the oxidation process of the tire primarily comes from the inflation media. Therefore, it is reasonable to assume that oxidation of tire components can be reduced if the tire is inflated with pure nitrogen. However, only very small amounts of oxygen are required to begin the normal oxidation process. Even slight contamination of the tire inflation gas with compressed atmospheric air during normal inflation pressure maintenance, may negate the benefits of using nitrogen.
GM Tire Quality, Technology and Focus of Importance

Since 1972, General Motors has designed tires under the TPC (Tire Performance Criteria) specification system, which includes specific requirements that ensure robust tire performance under normal usage. General Motors works with tire suppliers to design and manufacture original equipment tires for GM vehicles. The GM TPC addresses required performance with respect to both inflation pressure retention, and endurance properties for original equipment tires. The inflation pressure retention requirements address availability of oxygen and oxidation concerns, while endurance requirements ensure the mechanical structure of the tire has sufficient strength. This combination has provided our customers with tires that maintain their structural integrity throughout their useful treadlife under normal operating conditions.
Regardless of the inflation media for tires (atmospheric air or nitrogen), inflation pressure maintenance of tires is critical for overall tire, and ultimately, vehicle performance. Maintaining the correct inflation pressure allows the tire to perform as intended by the vehicle manufacturer in many areas, including comfort, fuel economy, stopping distance, cornering, traction, treadwear, and noise. Since the load carrying capability of a tire is related to inflation pressure, proper inflation pressure maintenance is necessary for the tire to support the load imposed by the vehicle without excessive structural degradation.
Important: Regardless of the inflation media for tires (atmospheric air or nitrogen), inflation pressure maintenance of tires is critical for overall tire, and ultimately, vehicle performance.
<TABLE width="95%"><TBODY><TR><TD align=left width="80%">GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.





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© 2008 General Motors Corporation. All rights reserved.
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Cadillac Tech

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<SCRIPT src="/si/gsiFunctions.js"></SCRIPT><SCRIPT> <!-- window.onload = function() { xAddEventListener(window, "resize", reSizeDivision, false); reSizeDivision(); addScrollSave(); xGetElementById('dBody').scrollTop = xGetElementById('scrollSave').value; } window.onunload = function() { removeScrollSave(); } --> </SCRIPT><FORM name=CellHandlerForm onsubmit="JavaScript: return true;" action=/si/cellHandler.do method=post><INPUT id=scrollSave type=hidden value=0 name=scrollSave> | Document ID: 2033347 <HR>
#00-00-90-002I: Information on Proper Tire Pressure - (Oct 23, 2007)

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Information on Proper Tire Pressure</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2008 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2008 and Prior HUMMER H2, H3</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2008 Saab 9-7X</TD></TR></TBODY></TABLE>​


<HR>This bulletin is being revised to add information about the 2008 HUMMER H2. Please discard Corporate Bulletin Number 00-00-90-002H (Section 00 - General Information).
<HR>
Important:
<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>ALL tires (including the spare tire) MUST be set to the recommended inflation pressure stated on the vehicle's tire placard (on driver's door) during the PRE-DELIVERY INSPECTION (PDI). Recommended inflation pressure is not the pressure printed on tire sidewall.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>Tires may be over-inflated from the assembly plant due to the mounting process.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>Generally a 5.6°C (10°F) temperature change will result in (is equivalent to) a 6.9 kPa (1 psi) tire pressure change.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>2008 HUMMER H2 Only - The H2 comes standard with Light Truck "D" Load Range tires with a recommended cold inflation pressure of 289 kPa (42 psi). These tires will alert the driver to a low pressure situation at roughly 262 kPa (38 psi), due to a requirement in FMVSS 138, which specifies a Minimum Activation Pressure for each tire type. This creates a relatively narrow window of "usable" pressure values, and the warning will be more sensitive to outside temperature changes during the colder months.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> </TD><TD vAlign=top>As with other cold temperature / Tire pressure issues, there is nothing wrong with the system itself. If a vehicle is brought in with this concern, check for tire damage and set all tires to the Recommended Cold Inflation Pressure shown on the vehicle placard.</TD></TR></TBODY></TABLE>​

Accurate tire pressures ensure the safe handling and appropriate ride characteristics of GM cars and trucks. It is critical that the tire pressure be adjusted to the specifications on the vehicle's tire placard during PDI.
Ride, handling and road noise concerns may be caused by improperly adjusted tire pressure.
The first step in the diagnosis of these concerns is to verify that the tires are inflated to the correct pressures. The recommended tire inflation pressure is listed on the vehicle's tire placard. The tire placard is located on the driver's side front or rear door edge, center pillar, or the rear compartment lid.

Tip
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Generally a 5.6°C (10°F) temperature increase will result in (is equivalent to) a 6.9 kPa (1 psi) tire pressure increase.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>The definition of a "cold" tire is one that has been sitting for at least 3 hours, or driven no more than 1.6 km (1 mi).</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>On extremely cold days, if the vehicle has been indoors, it may be necessary to compensate for the low external temperature by adding additional air to the tire during PDI.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>During cold weather, the TPM indicator light (a yellow horseshoe with an exclamation point) may illuminate. If this indicator turns off after the tires warm up (reach operating temperature), the tire pressure should be reset to placard pressure at the cold temperature. </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>System will work with nitrogen in tires.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>System will work with the GM Tire Sealant but may not with other commercially available sealants.</TD></TR></TBODY></TABLE>​

Important:
<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>Do not use the tire pressure indicated on the tire itself as a guide.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>Always inspect and adjust the pressure when the tires are cold.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top></TD><TD vAlign=top>Vehicles that have different pressures for the front and the rear need to be adjusted after tire rotation.</TD></TR></TBODY></TABLE>​

Improper tire inflation may result in any or all of the following conditions:
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Premature tire wear</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Harsh ride</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Excessive road noise</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Poor handling</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Reduced fuel economy</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Low Tire Pressure Monitor (TPM) Light ON</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>Low Tire Pressure Message on the Drivers Information Center (DIC)</TD></TR></TBODY></TABLE>​
<TABLE width="95%"><TBODY><TR><TD align=left width="80%">GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

</TD><TD align=middle width=42>
</TD><TD align=middle width=167>WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
</TD></TR></TBODY></TABLE>​
© 2008 General Motors Corporation. All rights reserved.
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Cadillac Tech

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#06-03-10-010: Information on Proper Wheel Changing Procedures and Cautions - (Sep 7, 2006)
<FORM name=CellHandlerForm onsubmit="javascript: return true;" action=/si/cellHandler.do method=post>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Information on Proper Wheel Changing Procedures and Cautions</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2007 and Prior GM Passenger Cars and Trucks (including Saturn)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007 and Prior HUMMER Models</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2007 Saab 9-7X</TD></TR></TBODY></TABLE>​


<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Attention: </TD><TD vAlign=top>Complete wheel changing instructions for each vehicle line can be found under Tire and Wheel Removal and Installation in Service Information (SI). This bulletin is intended to quickly review and reinforce simple but vital procedures to reduce the possibility of achieving low torque during wheel installation. Always refer to SI for wheel lug nut torque specifications and complete jacking instructions for safe wheel changing.</TD></TR></TBODY></TABLE>​



<HR><A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1860939&from=sm#ss1-1860939">Frequency of Wheel Changes -- Marketplace Driven

Just a few years ago, the increasing longevity of tires along with greater resistance to punctures had reduced the number of times wheels were removed to just required tire rotation intervals. Today with the booming business in accessory wheels/special application tires (such as winter tires), consumers are having tire/wheel assemblies removed -- replaced -- or installed more than ever. With this increased activity, it opens up more of a chance for error on the part of the technician. This bulletin will review a few of the common concerns and mistakes to make yourself aware of.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1860939&from=sm#ss2-1860939">Proper Servicing Starts With the Right Tools

The following tools have been made available to assist in proper wheel and tire removal and installation.

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>J 39544-KIT Complete Torque Socket Set or equivalent.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>J 41013 Rotor Resurfacing Kit or Equivalent</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>J 42450-A Wheel Hub Resurfacing Kit or Equivalent</TD></TR></TBODY></TABLE>​


<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1860939&from=sm#ss3-1860939">Corroded Surfaces

One area of concern is corrosion on the mating surfaces of the wheel to the hub on the vehicle. Excessive corrosion, dirt, rust or debris built up on these surfaces can mimic a properly tightened wheel in the service stall. Once the vehicle is driven, the debris may loosen, grind up or be washed away from water splash. This action may result in clearance at the mating surface of the wheel and an under-torqued condition.
Caution: Before installing a wheel, remove any buildup on the wheel mounting surface and brake drum or brake disc mounting surface. Installing wheels with poor metal-to-metal contact at the mounting surfaces can cause wheel nuts to loosen. This may cause a wheel to come off when the vehicle is moving, possibly resulting in a loss of control or personal injury.
Whenever you remove the tire/wheel assemblies, you must inspect the mating surfaces. If corrosion is found, you should remove the debris with a die grinder equipped with a fine sanding pad, wire brush or cleaning disc. Just remove enough material to assure a clean, smooth mating surface.
The J 41013, or equivalent can be used to clean the following surfaces:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The hub mounting surface</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The brake rotor mounting surface</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The wheel mounting surface</TD></TR></TBODY></TABLE>​


Use the J 42450-A or equivalent, to clean around the base of the studs and the hub.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1860939&from=sm#ss4-1860939">Lubricants, Grease and Fluids

Some customers may use penetrating oils, grease or other lubricants on wheel studs to aid in removal or installation. Always use a suitable cleaner/solvent to remove these lubricants prior to installing the wheel and tire assemblies. Lubricants left on the wheel studs may cause improper readings of wheel nut torque. Always install wheels to clean, dry wheel studs ONLY.
Notice: Lubricants left on the wheel studs or vertical mounting surfaces between the wheel and the rotor or drum may cause the wheel to work itself loose after the vehicle is driven. Always install wheels to clean, dry wheel studs and surfaces ONLY.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1860939&from=sm#ss5-1860939">Wheel Stud and Lug Nut Damage

Always inspect the wheel studs and lug nuts for signs of damage from crossthreading or abuse. You should never have to force wheel nuts down the stud. Lug nuts that are damaged may not retain properly, yet give the impression of fully tightening. Always inspect and replace any component suspected of damage.
Tip
Always start wheel nuts by hand! Be certain that all wheel nut threads have been engaged BEFORE tightening the nut.
Important: If the vehicle has directional tread tires, verify the directional arrow on the outboard side of the tire is pointing in the direction of forward rotation.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1860939&from=sm#ss6-1860939">Wheel Nut Tightening and Torque

Improper wheel nut tightening can lead to brake pulsation and rotor damage. In order to avoid additional brake repairs, evenly tighten the wheel nuts to the proper torque specification as shown for each vehicle in SI. Use the J 39544-KIT, or the equivalent torque stick, in order to tighten the nuts with an impact wrench. When running the nuts down the studs, run the impact wrench at a reasonable speed. Always observe the proper wheel nut tightening sequence as shown below in order to avoid trapping the wheel on the wheel stud threads or clamping the wheel slightly off center resulting in vibration.​





While the above information is well known, and wheel removal so common, technicians run the risk of becoming complacent on this very important service operation. A simple distraction or time constraint that rushes the job may result in personal injury if the greatest of care is not exercised. Make it a habit to double check your work and to always side with caution when installing wheels.
<TABLE width="95%"><TBODY><TR><TD align=left width="80%">GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

</TD><TD align=middle width=42> </TD><TD align=middle width=167>WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
</TD></TR></TBODY></TABLE>​
© 2008 General Motors Corporation. All rights reserved.
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Cadillac Tech

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Document ID: 1739179 <HR>
<FORM name=CellHandlerForm onsubmit="javascript: return true;" action=/si/cellHandler.do method=post>#05-03-10-019: Information on Run Flat, Zero Pressure or Extended Mobility Tires (EMT) and Unique Servicing Techniques - (Dec 6, 2005)


<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Information on Run Flat, Zero Pressure or Extended Mobility Tires (EMT) and Unique Servicing Techniques</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2004-2006 Cadillac CTS-V</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2006 Cadillac XLR</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2006 Cadillac XLR-V, STS-V</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>1994-2006 Chevrolet Corvette</TD></TR></TBODY></TABLE>​




<HR>This bulletin is being revised to add vehicles, model years, tire manufacturers, and additional information. Please discard Corporate Bulletin Number 33-35-02A.

<HR><A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1739179&from=sm#ss1-1739179">Tire Manufacturers

GM currently uses tires from three manufacturers that can continue to be driven on while completely deflated. Each brand has their own slogan for this capability.

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Goodyear -- Extended Mobility Tire (EMT)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Michelin -- Run Flat</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Pirelli -- Zero Pressure (ZP)</TD></TR></TBODY></TABLE>​


Characteristics and Added Capability


The tires above can be operated at up to 89 km/h (55 mph) for 160 km (100 mi) with zero air pressure. All vehicles originally installed with this style of tire are factory-equipped with a tire pressure monitoring system (TPM). Each wheel position has a sensor which transmits inflation pressures to a receiver that displays actual pressures to the driver. This system immediately alerts the driver of a loss of air pressure in any tire, as it is possible to drive with zero air pressure and not notice any difference in vehicle handling.
Mounting and Dismounting

Due to the unique reinforced sidewall construction of this type of tire some special servicing techniques are required. This mainly pertains to mounting and dismounting the tire from the wheel.
Caution: Inflation pressure exceeding 276 kPa (40 psi) may be required to seat the beads during mounting. To prevent serious injury, only specially trained tire technicians should mount or dismount these tires. A tire inflation safety cage and clip-on air hose must be used. A rim clamp/European style tire changer is also recommended to mount or dismount run-flat type tires.
If a "run-flat" style tire must be dismounted for non-tire related reasons such as a wheel, valve, or sensor replacement, it is recommended that the job be sublet to an authorized tire service facility if your dealership DOES NOT have qualified personnel and the necessary equipment described above.
Extreme care must be taken that the tire pressure warning sensor and O-ring inside the tire are not damaged. Some tire changing equipment companies such as Coats* and Hunter* have put together a procedure booklet for these tires.
Caution: Even when using a safety cage to seat the tire bead, do not exceed 552 kPa (80 psi). If the bead does not seat by 552 kPa (80 psi), you should deflate the tire and change the position of the tire in relation to the wheel. Use of tire lubricant is also advisable.
*We believe these sources and their equipment to be reliable. There may be additional manufacturers of such equipment.​
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Cadillac Tech

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Document ID: 2213638 <HR>
<FORM name=CellHandlerForm onsubmit="javascript: return true;" action=/si/cellHandler.do method=post>#03-03-10-007D: Information on Tire/Wheel Characteristics (Vibration, Balance, Shake, Flat Spotting) of GM Original Equipment Tires - (Nov 24, 2008)


<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Information on Tire/Wheel Characteristics (Vibration, Balance, Shake, Flat Spotting) of GM Original Equipment Tires</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2009 and Prior GM Passenger Cars and Light Duty Trucks (Including Saturn)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2009 and Prior HUMMER H2, H3</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2009 and Prior Saab 9-7X</TD></TR></TBODY></TABLE>​




<HR>This bulletin is being revised to include additional model years. Please discard Corporate Bulletin Number 03-03-10-007C (Section 03 - Suspension).

<HR>The purpose of this bulletin is to help explain that , under certain circumstances, a customer may notice a slight tire shake within the first few miles/kilometers of vehicle operation.
Tires may be designed with a nylon overlay configuration engineered to enhance the tire's integrity at high speeds. This allows the tires to be driven at higher speeds without excessive heat buildup.
Important: Before measuring tires on equipment such as the Hunter GSP 9700, the vehicle MUST be driven a minimum of 16 km (10 mi) to ensure removal of any flat spotting (The tendency to "flat spot" is less likely as the tire accumulates mileage).
When parked overnight, or for a period of time, the tires may set (flat spot) and require a few miles/kilometers before heating up to their normal operating temperature. Until the tires warm up, a slight tire shake may be felt but should subside quickly.
Important: DEALERS SHOULD REFRAIN FROM ATTEMPTING REPAIRS OR REPLACING COMPONENTS for this temporary tire flat spotting condition.
<TABLE width="95%"><TBODY><TR><TD align=left width="80%"></TD><TD align=middle width=42>
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Photo Girl

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My XLR/V(s)
Not Yet. Official Photographer and Activities Director of the MMs
So this is what you were doing Sunday morning....I thought you were playing with your PS 3 :laugh:

Kathy:lol::lol:
 

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