Blue Bird D3RE 2014 Driver's Handbook Manual page 113

Whenever tap water alone has been added, the bus should be taken to a service
facility and the entire cooling system should be completely drained, flushed, and
refilled with premix coolant.
Blue Bird buses equipped with Cummins engines may also be equipped with an
optional coolant filter. The coolant filter should be replaced every 6 months or 6,000
miles; whichever occurs first . The coolant filter element installed at the Blue Bird fac-
tory is compatible with all of the above-described coolants:
B
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See your Blue Bird D3RE Service Manual for complete detailed Coolant Fill procedures.
CARE & MAINTENANCE
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