Northern Lights — Cooling System Flushing

Maintenance

From a Northern Lights operator's manual covering: NL378, NL378x, NL484, NL488x, NL498x. Check it applies to your exact model before use.

Applies to: Northern Lights NL378, Northern Lights NL378x, Northern Lights NL484, Northern Lights NL488x, Northern Lights NL498x

Procedure

1. Flush the cooling system every 600 hours or every 12 months, whichever comes first.
2. Remove radiator cap and open drains on radiator and engine block.
3. Pour clean water into radiator until water coming from radiator is clear of discoloration.
4. Close radiator drain and continue flushing until water from engine drain is clear.
5. Open all drains and drain engine and radiator completely.
6. Close drains and refill radiator with recommended coolant mixture (50% water / 50% ethylene glycol antifreeze).
7. Check hoses and connections and repair any leakage.
8. Start engine and check for leaks; run engine for five minutes, then shut it down.
9. Let engine cool, then check coolant level and add as needed.

Full service-parts list: Northern Lights NL378 →, Northern Lights NL378x →, Northern Lights NL484 →, Northern Lights NL488x →, Northern Lights NL498x →

Source: Northern Lights operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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