1995 GMC Jimmy Owner's Manual - Page 280

Air Conditioning Every now and then have your dealership check your air conditioning system to be sure it has not lost any cooling ability.If you think the system is not working properly, have your dealership check it out as soon as possible. The airconditioning will not work when the temperature is below40°F (4°C). Lock Cylinders To be sure your locks operate properly, they mustbe lubricated. Refer to the Maintenance Scheduleto determine how often to lubricate them and what type of lubricant to use. You should not use penetrating because they could wash the factory oils out installed lubricant and cause the lock to bind. De-icers which contain alcohol could also wash away thelubricant, so be sure to lubricate the lock after using a de-icer of this type. Exhaust System To help prevent damage to your exhaust system, do not continue to drive your vehicle if you notice: Engine misfiring Loss of performance Exhaust system components hanging lower thannormal. Loud exhaust system noises. Other unusual operating conditions Have your engine and exhaust system serviced regularly. Three- WayCatalytic Converter Your vehicle's three-way catalytic converter is designed to reduce the pollutants in your vehicle'sexhaust. Use only unleadedfuel in your vehicle. If you use leadedfuel, you could damage your three-way catalytic converter and other engine components. Engine Control Module System This system has anoxygen (02) sensor that helps keep your engine's air-fuel mixture at a proper level. Use only unleadedfuel in your vehicle. If you use leaded fuel, you could damage your oxygen (02) sensor and affect your vehicle'semissions. 6-40