11
If any of these conditions exist the hose
should be replaced with a recommended OEM
replacement part.
Inspect the radiator cap to ensure proper seal-
ing.
COOLANT
Check coolant level in coolant recovery tank and
add coolant as required. Add 50/50 mixture of
GM Dexcool antifreeze and water or coolant per
engine manufacturer’s instructions. Do not add
plain water. Replace coolant per the recommend-
ed schedule.
IMPORTANT:
The manufacturers of the engine and fuel system
do not recommend the use of “stop leak” additives
to repair leaks in the cooling system. If leaks are
present the radiator should be removed and re-
paired or replaced.
ENGINE ELECTRICAL SYSTEM MAINTNANCE
The engine’s electrical system incorporates com-
puters to control various related components. The
electrical system connections and ground circuits
require good connections. Follow the recom-
mended maintenance schedule in this section to
maintain optimum performance. When inspecting
the electrical system check the following:
Check Positive and Negative cables for corro-
sion, rubbing, chafing, burning and to ensure
tight connections at both ends.
Check battery for cracks or damage to the
case and replace if necessary.
Inspect engine wire harness for rubbing, chaf-
ing, pinching, burning, and cracks or breaks in
the wiring.
Verify that engine harness connectors are cor-
rectly locked in by pushing in and then pulling
the connector halves outward.
Inspect ignition coil wire for hardening, crack-
ing, arcing, chafing, burning, separation, split
boot covers.
Check spark plug wires for hardening, crack-
ing, chafing, arcing or burning, separation, and
split boot covers.
Replace spark plugs at the required intervals
per the recommended maintenance schedule.
Verify that all electrical components are se-
curely mounted to the engine or chassis.
Verify that any additional electrical services
installed by the owner are properly installed in
the system.
Verify that the MIL, charging, and oil pressure
lights illuminate momentarily during engine start.
ENGINE CRANKCASE OIL
OIL RECOMMENDATION
Select an engine oil viscosity that will best match
the prevailing daytime temperature:
The oil must meet GM specification 9986231. Mo-
tor oils meeting this spec receive the API
(American Petroleum Institute) starburst symbol:
ILSAC GF-4 oils are highly recommended. Oils
meeting the SL-4 spec are improved over the pre-
vious generation GF-3 oils in many ways
Reduced Phosphorous levels (20%) for re-
duced catalyst poisoning
Improved oxidation resistance (4X oxidation
inhibitor treat level = 100% improvement)
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