Cessna 152 Utility System

HEATING SYSTEM:
The heating system is comprised of the heat exchange section of the exhaust muffler, a shut-off valve mounted on the right forward side of the firewall, a push pull control on the instrument panel, Outlets and flexible ducting connecting the system.
OPERATION:
Ram air is ducted through an engine baffle inlet and heat exchange section of the exhaust muffler, to the shut-off valve at the firewall. The heated air flows from the shutoff valve into a duct across the aft side of the firewall, where it is distributed into the cabin. The shut-off valve, operated by a push-pull control marked "CABIN HT" located on the instrument panel, regulates the volume of heated air entering the system. Pulling the control full out, supplies maximum flow and pushing control in gradually decreases flow shutting off flow completely when the control is pushed full in.
DEFROSTER SYSTEM:
The defrosting system is comprised of the duct across the aft side of the firewall, a defroster outlet mounted on the left side of the cowl deck immediately aft of the windshield, and flexible ducting connecting the system.
OPERATION:
Air from the duct across the aft side of the firewall flows through a flexible duct to the defroster outlet. The temperature and volume of this air is controlled by the settings of the heater system control.
VENTILATING SYSTEM.
The ventilating system is comprised of an air scoop mounted in the inboard
leading edge of each wing, an adjustable ventilator mounted on each side of the cabin near the upper corners of the windshield, a fresh air scoop door mounted on the right side of the fuselage, a control knob on the instrument panel and flexible ducting connecting the system

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