K 3500 Truck 4WD V8-5.7L VIN R (1998)
Coolant: Testing and Inspection
Exhaust Gas Leak Test
SYSTEM CHECK
NOTICE: Exhaust gasses may enter the cooling system through a leaking cylinder head gasket. Exhaust gasses combine with water to form acids.
These acids are harmful to the cooling system and the engine.
In order to check for exhaust gases leaking into the cooling system, do the following steps:
1. Drain the coolant system until the coolant level stands just above the top of the cylinder heads.
2. Disconnect the upper radiator hose.
3. Remove the thermostat.
4. Remove the drive belt.
5. Start the engine and accelerate several times.
6. Inspect the coolant level for the appearance of bubbles or a significant rise in the coolant level. If the coolant level rises or bubbles appear, coolant
may be leaking into engine. Inspect the spark plugs.
