e. Pressure Testing Cooling System.
If cooling system pressure loss is
suspected, check radiator cap first. Any
foreign material or deposits on cap, cap
seal, or radiator opening can cause
Remove radiator cap (3) from radiator (4).
Make sure the radiator is adequately
Attach cooling system pressurizer to radiator
Pressurize cooling system to between eight
and ten psi.
Check cooling system for leakage.
Check radiator for visible leakage.
Replace radiator if leaks are present. Refer to Removal and Installation sections above.
Check all connections and hoses of cooling system for visible leakage. Replace leaking heater and radiator
hoses as required (Para 7-4).
· If leakage is not observed in Steps (a) and (b) above, continue to pressurize system for five minutes
and observe pressure gauge on cooling system pressurizer.
· If pressure remains constant after five minutes of pressurization, radiator and cooling system do not
· If pressure lowers during five minutes of pressurization, internal cooling system leak in engine or
transmission is present. Refer to Direct Support Maintenance.
After test is completed, remove pressurizer from radiator filler neck and install radiator cap (3) on radiator
END OF TASK