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Home >> Volkswagen >> 1969 >> Fastback Eng CD AD, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> VOLKSWAGEN Engine Modification >> Operation >> Heat Valve
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Heat Valve

Heat valve admits warm air from engine cooling system or cool air from engine compartment. Valve is operated by a bi-metal spring in air duct. Valve shuts off supply of heated air at ambient temperatures of 79° For above. A second flap in air cleaner, controlled by a cable to cooling fan flap thermostat, admits warm air to carburetor at lower engine temperatures.