1997 GMC Sonoma Owner's Manual - Page 346

I I i ShortTripKityMaintenanceSchedule 100,000 Miles (166 000 km) (Continued) g y o u do notuse your vehicle under any of these conditions, thefluid andfilter not require changing. do 150,000 Miles (240 000 km) 0Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See "Engine Coolant" in the Index for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck.Pressure test cooling system andpressure cap. An Emission Control Service. Manual transmission fluid doesn't require change. 0Inspect Positive Crankcase Ventilation (PCV) valve. An Emission Control Service. DATE ACTUAL MILEAGE SERVICED BY: DATE MILEAGE ACTUAL SERVICED BY: 7-36