Chevrolet 2002 Tahoe Owner's Manual page 419

Scheduled Maintenance
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
the cooling system and pressure cap.
An Emission Control Service.
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Change five speed manual transmission fluid (with 4300 V6 or
4800 V8 engines only).
7-16
DATE
ACTUAL
SERVICED BY:
MILEAGE