Chapter 4 N39453
Page 68
How to drain the coolant circuit - 4.4GM
Warnings!
• Do not drain the coolant while the engine is still hot and the system is under pressure because dangerous
hot coolant can be discharged.
• Discard used coolant in a safe place and in accordance with local regulations.
1. Remove the ller cap of the coolant circuit (BB1).
2. Remove the drain plugs (CC1) from the side of the cylinder block and the heat exchanger (DD1). Ensure
that the drain holes are not restricted.
3. After the system has been drained, t the ller cap and the drain plugs.
4. Fasten a label in a suitable place to indicate that the coolant system has been drained.
Caution: The closed circuit system cannot be drained completely. If the coolant is drained for engine
preservation purposes or for protection from frost, the coolant system must be lled again with an approved
antifreeze mixture. See “Coolant specication” in section 5 for details of the correct coolant to be used in the
circuit.
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