Chevrolet 2001 3500HD Manual page 280

Short Trip/City Scheduled Maintenance
100,000 Miles (166 000 km)
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Gasoline Engine Only: Inspect spark plug wires.
An Emission Control Service.
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Gasoline Engine Only: Replace spark plugs.
An Emission Control Service.
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Change automatic transmission fluid and filter. Manual transmission fluid
doesn't require change.
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Gasoline Engine Only: Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)
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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.
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