Cummins/Onan — Coolant System

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Procedure

1. Coolant Inlet
2. Pump Impeller
3. Coolant Flow Past
4. Coolant Flow Past
5. Coolant to Cylinder is
6. Coolant to Thermostat Housing

Source: manual:CONTENTS-Cummins-B-Series-Troubleshooting-Repair-3666087-588pages.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.