Hummer H2. Manual — part 72
Fig. 1: Drive Axle Gear Tooth Patterns
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1998 Chevrolet Pickup C1500
GENERAL INFORMATION Gear Tooth Contact Patterns
GENERAL INFORMATION
General Cooling System Service
DESCRIPTION
The liquid cooling system consists of a radiator, water pump, thermostat, electric or belt-driven cooling fan,
pressure cap, heater, and various connecting hoses and cooling passages in the engine block and cylinder head.
MAINTENANCE
DRAINING
Remove radiator cap and open heater control valve to maximum heat position. Open drain cocks or remove
plugs in bottom of radiator and engine block. In-line engines usually have one plug or drain cock, while "V"
type engines have 2, one in each bank of cylinders.
FLUSHING
Radiator
Connect flushing gun to water outlet of radiator. Disconnect water inlet hose. To prevent flooding engine, use a
hose connected to radiator inlet. Use air in short bursts to prevent damage to radiator. Continue flushing until
water runs clear.
Engine Block
To flush engine, remove thermostat. Connect flushing gun to water outlet of radiator. Use air in short bursts to
prevent damage to radiator. Continue flushing until water runs clear.
REFILLING
To prevent air from being trapped in engine block, engine should be running when refilling cooling system.
After system is full, continue running engine until thermostat is open, then recheck fill level. Do not overfill
system.
TESTING
THERMOSTAT
1. Remove and inspect thermostat for corrosion and proper seating of valve. If okay, suspend thermostat and
thermometer in a 50/50 mixture of coolant and water. See Fig. 1 . DO NOT allow thermostat or
CAUTION: Some manufacturers use an aluminum and plastic radiator. Flushing
solution must be compatible with aluminum.
1998 Chevrolet Pickup C1500
GENERAL INFORMATION General Cooling System Service
1998 Chevrolet Pickup C1500
GENERAL INFORMATION General Cooling System Service
thermometer to touch bottom or container. Heat water until thermostat begins to open.
2. Read temperature on thermometer. This is the initial opening temperature and should be within
specification. Continue heating water until thermostat is fully open and note temperature. This is the fully
open temperature. If either reading is not to specification, replace thermostat.
Fig. 1: Testing Thermostat in Coolant/Water Solution
PRESSURE TESTING
A pressure tester is used to check both radiator cap and complete cooling system. Follow pressure tester
manufacturer instructions and test components as follows:
Radiator Cap
Visually inspect radiator cap. If cap looks okay, connect pressure tester to cap. See Fig. 2 . Pressurize tester to
full radiator cap specification. Replace cap if it fails to hold pressure.
1998 Chevrolet Pickup C1500
GENERAL INFORMATION General Cooling System Service
Fig. 2: Pressure Testing Radiator Cap
Cooling System
1. Turn ignition off and allow engine to cool. Ensure radiator if filled to correct level. Remove cap and
attach pressure tester to radiator. Pressurize tester to full radiator rating specification.
2. If pressure drops, check for external leaks. If no leaks are found, start engine and allow to idle. If pressure
builds up immediately, check cylinder head and block for cracks. If pressure does not build up
immediately, go to next step.
3. Using pressure tester, pump cooling system up to pressure specified on radiator cap. If pump gauge
pointer vibrates, compression or combustion leak into cooling system is indicated. Isolate leak by
shorting each spark plug wire to cylinder block. Gauge pointer vibration will stop or decrease when
leaking cylinder is shorted.
CAUTION: DO NOT allow excess pressure to build in cooling system or damage
may result.
1998 Chevrolet Pickup C1500
GENERAL INFORMATION General Cooling System Service
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