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D R I V E R O R I E N T A T I O N
D R I V E R O R I E N T A T I O N
Heater Filters
All heater cores are protected by a filter except for the driver’s heater which has a screen.
The filters and screen are washable. If a filter cannot be washed or is damaged, it MUST
be replaced immediately. If the screen cannot be cleaned a new screen MUST be installed
immediately. The filters must be inspected, cleaned or replaced every 12 months or 12,000
miles.
The main heater filter is located behind a small panel at the driver’s left. This panel is
held in place by luggage type over the center clasps. To remove the filter, pull upward and
outward. To replace the filter, press it firmly into position and replace the cover panel. The
cover panel must be in place to maintain the airflow through the filter.
Heater Cores
The heater will be most efficient when the core is clean. The core should be cleaned care-
fully with compressed dry air or a vacuum and a soft bristle brush. Damaged fins should
be straightened with a fin comb to prevent air flow restrictions. Heater cores must be in-
spected and cleaned every 12 months or 12,000 miles.
Maintenance intervals for filters and cores are minimum. In extreme dusty and dirty envi-
ronments the maintenance must be performed more often to insure proper air flow. Main-
tenance and inspection of all the heater cores and filters and/or screens in the heater sys-
tem is critical to prevent loss of efficiency, function and/or premature heater motor failure.
Replace parts with OEM parts purchased from you Blue Bird Dealer.
Heater Filter Access
Summary of Contents for Vision 2021
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