Cummins/Onan — System - Pressure Test
Testing & diagnosis · Cooling system
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Top off coolant
- Remove/install pressure tester
- Pressurize system
- Check for leaks
Tools required
- Pressure tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.