Skylark L4-138 2.3L SOHC VIN 3 MFI QUAD 4 (1992)
Ethylene glycol antifreeze is a very toxic chemical; disposing of it into the sewer system or ground water is both illegal and ecologically
unsound!
Inspect
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The drained coolant:
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If the coolant is discolored, flush the cooling system; refer to "Flushing" in this section.
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If the coolant appearance is normal, continue with the filling procedure; refer to "Filling" in this section.
Flushing
Various methods and equipment may be used to flush the system. If using special equipment such as a back flusher, follow the manufacturer's
instructions. However, the thermostat should be removed before flushing the system.
Engine Coolant Recycling
As the need arises to conduct cooling system maintenance or repairs, all of the used coolant must be removed and replaced with qualified new or
recycled coolant. If only the radiator is drained, up to 40% of the used, contaminated, coolant can remain in the cooling system. Used coolant removal
(from the vehicle) can be accomplished by several methods:
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Utilize waterless, coolant evacuation system available in the GM Dealer Equipment program (or equivalent) which removes the used coolant
and replaces it with approved new or recycled coolant.
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Utilize a GM approved coolant recycling system which recycles the coolant on the vehicle thereby eliminating the need for evacuation.
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Recover coolant and store in a used coolant holding tank and submit the used coolant for recycling on a regular basis.
Filling
1. Close the radiator drain valve.
2. Install all engine block drain plugs if previously removed.
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Use pipe sealer when installing drain plugs.
CAUTION: Under some conditions, the ethylene glycol in engine coolant is combustible. To help avoid being burned, DO NOT spill antifreeze
or coolant on the exhaust system or hot engine parts.
3. Refill the cooling system with coolant meeting GM Specification 1825-M. To ensure sufficient engine cooling, freezing and corrosion protection,
maintain the protection level at -37°C (-34°F) or lower. Use a solution that is no more than 70 percent antifreeze.
Important
When refilling the engine cooling system, add engine coolant supplement sealant, GM Part # 3634621 or equivalent, and coolant antifreeze meeting GM
specification 1825-M.
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Add (2) crushed coolant pellets.
4. Fill surge tank with the proper mix of coolant to just above the "Small Cylinder" at the base of the tank opening or until the level reaches the "Split
Line" formed by the black and tan parts of the tank.
5. With the pressure cap off, start the engine and let it run until the upper radiator hose starts to get hot.
CAUTION: Keep hands clear of fan.
6. If coolant is lower then "Small Cylinder", add proper mix of coolant to the surge tank until the level reaches the "Split line."
7. Install the surge tank pressure cap onto the surge tank with hand tight pressure.
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After servicing the cooling system, an occasional intermittent low coolant light (if equipped) may be encountered during some extreme driving
maneuvers. 'This complaint should be eliminated by removing the surge tank cap and adding coolant to a level just at or above the "Split Line"
when the system is cold.
