PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 1
Nov 30/06
2C15
21-40-00
HEATING
1. Description and Operation (See Figure 1.)
CAUTION: WHEN CABIN HEAT IS OPERATED, HEAT DUCT SURFACE BECOMES HOT. THIS
COULD RESULT IN BURNS IF ARMS OR LEGS ARE PLACED TOO CLOSE TO HEAT
DUCT OUTLETS OR SURFACE.
Fresh air is ducted from the heating intake vent located on the left forward engine baffle to the heater
shroud which is attached to the muffler. The heated air is then ducted to the valve box mounted on the
firewall. When the valve is open, heated air enters the heat ducts located along each side of the center
console. Outlets in the heat ducts are located at each seat location. Airflow to the rear seats can be
regulated by controls in the heat ducts located between the front seats. The temperature of the cabin is
regulated by the heater control located on the right side of the instrument panel.
Defrosting is accomplished by heat outlets located on the right and left side of the glareshield. Heated air
is ducted directly from the heater valve box to the defroster shut-off valves at the firewall and then to the
defroster outlets. The airflow is regulated by a defroster control located below the heat control.
To aid air distribution, the cabin air is exhausted overboard by an outlet located on the bottom of the
fuselage.
2. Heater Maintenance
If the exhaust manifold should become defective, carbon monoxide fumes may be discharged into the
cabin area. Therefore it is imperative that the exhaust manifold be inspected regularly. Refer to 78-00-00
for the inspection procedure. The heater shroud must be removed in order to inspect the manifold
assembly. Check the operation of the push-pull controls to insure the valve doors function properly. When
the controls are pulled out, the door should be completely open to permit full airflow. When the controls
are pushed in, the valves should close off all air passage and vent the air into the engine compartment.
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