1997 Pontiac Trans Sport Owner's Manual - Page 301

Engine Overheating You will find a coolant temperature gage your on Pontiac's instrument panel. "Engine Coolant See Temperature Gage" in the Index.You also havea low coolant level light your instrument panel. See "Low on Coolant Light" in the Index. ~ NOTICE: After driving in the overheated engine protection operating mode, to avoid engine damage, allow the engine to cool before attempting any repair. The engineoil will be severely degraded. Repair the cause of coolant loss and change the See oil. in "Engine Oil, When to Change" the Index. Overheated Engine Protection Operating Mode Should a low coolant condition exist, an overheat protection mode which alternates firing groups of three cylinders helps prevent engine damage. this mode, In you will noticea significant loss in power and engine performance. The low coolant light may come on and the temperature gage will indicate an overheat condition exists. This emergency operating mode allows your vehicle to be driven to a safe place in an emergency. Towing a trailer in the overheat protection mode should be avoided. 5-12