Northern Lights NL673 — Cooling System Flushing (SP14)
Maintenance
For the Northern Lights NL673, from the Northern Lights owner's manual.
Applies to: Northern Lights NL673
Before you start
- Allow the engine to cool before working on the cooling system; open the filler cap carefully using protective clothing.
Procedure
- Flush the cooling system every 2500 hours or every 12 months, whichever comes first.
- Remove radiator cap and open drain cocks on radiator and engine block.
- Pour clean water into radiator until water coming from radiator is clear of discoloration.
- Close the radiator drain and continue flushing until water from the engine drain is clear.
- Open all drain cocks and drain completely.
- Close drain cock and refill with 50% water / 50% ethylene glycol antifreeze mixture.
- Check hoses and connections and repair any leakage.
Specs & values
- Flush every 2500 hours or every 12 months
Full service-parts list: Northern Lights NL673 →
Source: Northern Lights owner'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.