It screws into the thermostat housing on my 89' Cressida. I see it id'd as bi-metallic vacuum switch - has an AISIN p/n 90925-05068
Link to pics below. The hose nipples have deteriorated and broken. What does it do and what happens when it's not working? Car seems to run okay but obviously it's there for a reason.
"This device is a heat-sensitive switch that remains closed until the engine's coolant reaches a certain temperature. The PVS screws into the intake manifold, thermostat housing or engine so the heat- sensing element is in contact with the engine's coolant. Inside the switch is a wax plug that pushes a sliding plunger to uncover or block vacuum ports in the switch. As the engine heats up, the wax expands and pushes the plunger up until it uncovers or blocks the vacuum port. At this point, vacuum to the device that the switch controls is either applied or blocked. Severe engine overheating can damage the switch, making replacement necessary."
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