2004 Chrysler PT Cruiser Owner's Manual - Page 259

MAINTAINING YOUR VEHICLE 259 the filter element should be inspected periodically and replaced if necessary at the intervals shown on Schedule "B". Maintenance-Free Battery You will never have to add water, nor is periodic maintenance required. WARNING! The air cleaner can provide a measure of protection in the case of engine backfire. Do not remove the air cleaner unless such removal is necessary for repair or maintenance. Make sure that no one is near the engine compartment before starting the vehicle with the air cleaner removed. Failure to do so can result in serious personal injury. CAUTION! When servicing the battery, always reinstall the battery thermowrap. The thermowrap provides battery heat protection and will extend overall battery life. Failure to reinstall the thermowrap can result in evaporative loss of the battery fluid. 7