Northern Lights — Flush cooling system
Maintenance
From a Northern Lights operator's manual covering: 753, M753, NL753. Check it applies to your exact model before use.
Applies to: Northern Lights 753, Northern Lights M753, Northern Lights NL753
Before you start
- Allow engine to cool before opening cap.
Procedure
- Flush every 600 hours or 12 months.
- Marine: remove expansion tank cap and drain block.
- Open block drain cock and heat exchanger plug.
- Pour clean water until drains run clear.
- Drain completely; close drains.
- Refill with 50/50 water/ethylene glycol coolant.
- Industrial: drain radiator and block; flush until clear.
- Refill with recommended coolant; check hoses.
Specs & values
- 50% water / 50% ethylene glycol
Full service-parts list: Northern Lights 753 →, Northern Lights M753 →, Northern Lights NL753 →
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.