Chevrolet 1997 Astro Owner's Manual page 353

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Short Trip/City Maintenance Schedule
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100,000 Miles (166 000 km)
CI
Inspect spark plug wires.
An Emission Control Service.
Replace spark plugs.
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Inspect Positive Crankcase Ventilation
( P c v ) valve.
An Emission Control Service.
An Emission Control Service.
DATE
SERVICED BY:
ACTUAL MILEAGE
150,000 Miles (240 000 km)
CI
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 cooling
system and pressure cap.
An Emission Control Service.
DATE ACTUAL MILEAGE
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SERVICED BY:
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7-29