Cummins/Onan — Draining and filling the cooling system
Maintenance
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Do not pour cold water into an overheated radiator; allow engine to cool first
Procedure
- To drain, open the drain cock at the lower right-hand corner of the radiator and the drain cock at lower left front corner of cylinder block.
- Close the drain cocks on the cylinder block and radiator.
- Fill the radiator with clean water or antifreeze solution.
- Do not overfill; solution should be 1 inch from the bottom of the filler neck.
Specs & values
- Cooling system capacity 15-1/2 quarts (PE-95-(2)/PE-95-F)
Source: Cummins/Onan service 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.