What is the sensor or valve, with two wires and a vacuum hose connected to it, is that is attached to the turbo intake hose on my Mitsubishi turbo?
[John Sargent/Dave Armstrong/Abe Crombie] This is the heated crankcase vent nipple (also referred to as the Positive Temperature Coefficient heater nipple) used on 90 and later where the air heater tube is deleted. The PTC nipple is mounted in the cold air intake pipe that runs from the air filter box to the turbo. It is in the elbow of the pipe, nearest the turbo. It has one or two vacuum hoses connected that run back to the oil trap. There is also an electrical connector about the size of a spark plug. Volvo decided that the preheat system which was thought would prevent throttle icing would not work on intercooled models due to cooling effect on air through the intercooler before it goes into the throttle. The heater is to vaporize the moist air that comes out of crankcase after start up and while driving in very cold weather. The LH fuel injection system on that car doesn’t use the Intake Air Temperature sensor. Occasionally one can experienced a pressurized manifold with too much
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