freightliner COLUMBIA CL112 Maintenance Manual page 122

Heater and Air Conditioner
3. Remove the retainer that holds the recirculation
air filter in place. See
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1. Retainer
2. Recirculation Air Filter
Fig. 4, Cab Recirculation Air Filter
4. Remove and discard the recirculation air filter.
5. Install a new recirculation air filter in the HVAC
assembly.
6. Install the retainer to hold the recirculation air
filter in place.
7. Install the heater and air conditioner cover and
the upper dash cover. For instructions, see Sec-
tion 60.08 of the Columbia
Sleeper Air Filter Replacement,
Blend Air
Replace the air filter in the sleeper HVAC unit every
six months, regardless of mileage. The filter should
not be cleaned.
CAUTION
If the sleeper air filter is not replaced every six
months, damage to the heater and air conditioner
components could occur. The HVAC system
should not be operated without the recirculation
air filter installed.
Columbia Maintenance Manual, October 2002
Fig. 4.
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Workshop Manual .
1. Turn off the engine, apply the brakes, and chock
the tires.
2. Access the sleeper HVAC assembly by raising
the mattress and bunk panel to the locked posi-
tion. If there is a baggage compartment, the
sleeper HVAC assembly may be accessed
through the baggage door on the right side of the
vehicle.
3. Slide the air filter out of the sleeper HVAC as-
sembly. See Fig. 5.
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1. Air Filter
Fig. 5, Sleeper HVAC Assembly
4. Discard the air filter.
5. Place a new air filter in the sleeper HVAC as-
sembly. The edge of the filter should be flush
with the HVAC assembly.
6. Lower the bunk panel and mattress.
7. Remove the chocks from the tires.
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