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[CAUTION] When replenishing or replacing coolant, only use coolant of the
same type already installed. Never mix coolants of different color, type, or
brand. Plain water is corrosive at engine operating temperatures. Never add
plain water to the system. When using concentrated coolant to raise the glycol
concentration for extreme temperature environments, Blue Bird recommends
only mixing the concentrate with pre-mixed coolant of the same type; not
mixing with water.
Coolant Testing and Replacement
Each engine manufacturer has its own specific requirements for coolant testing and
maintenance. Therefore, refer to the engine Operator's Manual for your bus and fol-
low the engine manufacturer's maintenance specifications.
Blue Bird recommends strictly abiding by the engine manufacturer's testing and
maintenance schedules and draining, flushing, refilling procedures to maintain com-
pliance with the engine warranty requirements. Blue Bird also recommends that you
maintain accurate vehicle-specific service records of all coolant system maintenance
procedures performed.
The cost of the testing is the owner's responsibility as part of the engine manu-
facturer's requirements for testing and maintaining the engine and coolant.
For Cummins engines using Fleetguard Fleetcool EX EG coolant, send coolant
samples to Fleetguard for Monitor C testing, as specified in the Cummins Operator's
Manual. Label sample as Conventional coolant.
For Cummins engines using Fleetguard ES Compleat OAT extended life coolant,
send coolant samples to Fleetguard for Monitor C testing, as specified in the Cum-
mins Operator's Manual. Label sample as Extended-Life coolant.
[CAUTION] Never mix coolant types.
Routine coolant addition (top-off) must match the installed coolant type and
brand. Do not mix coolants of different colors, types, or brands in the same engine.
[CAUTION] Always mix concentrate with premix coolant, not water.
If concentrated coolant is added in order to raise the glycol ratio, use only the
concentrate version of the same premix coolant type and brand as installed. Do not
mix the concentrate with water. Instead mix the concentrate with the premix version
of the same coolant.
[CAUTION] Only add tap water in emergency situations.
A regularly-scheduled bus inspection and maintenance program should be fol-
lowed to prevent coolant losses due to damaged or worn hoses, loose clamps, etc.
If coolant is lost while the bus is in use, and roadside emergency measures are
called for, replenish the coolant with the same premix type and brand if possible.
If the proper coolant is not available, and water must be used, use only de-ionized
water if possible. Ordinary tap water should only be used if proper coolant or de-
ionized water are not available.
110
DRIVER'S HANDBOOK
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