What does this sensor on Toyota thermostat housing do?

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.

Thanks.

formatting link

Reply to
brassplyer
Loading thread data ...

formatting link
"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."
formatting link

Reply to
.

"brassplyer" wrote

According to Autozone's 89-90 Cressida diagram, your BVSV decides when the charcoal cannister is allowed to vent its vapors into the intake manifold.

formatting link
or:
formatting link

Reply to
Sanity Clause

formatting link
>

My wife wishes I had one of those. I vent my vapors any time and anywhere I want.

Reply to
uncle_vito

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.