GMC 1997 Safari Owner's Manual page 366

100,000 Miles (166 000 km)
0
Inspect spark plug wires.
An Emission Control Service.
0
Replace spark plugs.
0
Inspect Positive Crankcase Ventilation
(Pcv)
valve.
An Emission Control Service.
An Emission Control Service.
DATE ACTUAL MILEAGE
SERVICED BY:
150,000 Miles (240 000 km)
0
Drain, 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 the
cooling system and pressure cap.
An Emission Control Service.
DATE SERVICED B Y ACTUAL MILEAGE