1996 Chevrolet Astro Owner's Manual - Page 248

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 notworking properly, have your dealership check it out as soon as possible. The air conditioningwill not work when the temperature is below 40°F (4°C). Lock Cylinders To be sure your locks operateproperly, they must be lubricated. Refer to the Maintenance Schedule to determine how often to lubricatethem and what type of lubricant touse. You should not use penetrating oils because they could wash out the factory installed lubricant and cause the lock to bind. De-icers which contain alcohol could also wash away the lubricant, so be sure tolubricate the lock after using a de-icer of this type. Exhaust System To help preventdamage to your exhaust system, do not continue to drive your vehicle if you notice: 0 Engine misfiring Loss of performance Exhaust system components hanging lower than normal. Loud exhaust system noises. Other unusual operating conditions Have your engine and exhaust system serviced regularly. Three-way Catalytic Converter Your vehicle's three-way catalytic converter is designed to reduce the pollutants in your vehicle's exhaust. Use only unleaded fuel inyour vehicle. If you use leaded fuel, you could damage your three-way catalytic converter and other enginecomponents. Engine ControlModule System This system has an oxygen (02) sensor that helps keep your engine's air-fuel mixture ata proper level. Use only unleaded fuel in your vehicle. If you use leaded fuel,you could damage your oxygen (02) sensor and affect your vehicle's emissions. 6-40