Two Vacuum Switches on Thermostat Housing???

[ColReb1295]

anyone know what the switches/Valves that are on the thermostat housing and/or what they do?

Both have two vacuum lines each that attach to them........one is brown in color and the other is green.....

the green one on my 78 FJ is leaking coolant and needs to be replaced.


Please help

 

[mossman40]

"BVSV"

This might help some:

https://forum.ih8mud.com/40-55-series-tech/18298-bvsv-thermostat-questions.html

 

[Fast Eddy]

Will stop the leak for sure, but it's a blue, part number 90925-05068

Toyota Celica MR2 BVSV PVS EVAP,EGR SENSOR 90925-05068 - eBay (item 120682518207 end time Mar-10-11 14:18:54 PST)

Found this:

The one to the left (black) is for EGR. Toyota part # 90925-05073. My manual states that this BVSV is closed below 40°C and is open above 54°C.
The one to the right (blue) is for charcoal canister. Toyota part # 90925-05058. It is closed below 35°C and open above 54°C.

54c is about 125f. 54c is about 130f.

Here are some other part numbers: 90925-05035, 90925-05042, 90925-05047, 25820-13020

You could post up on the 'parts wanted' forum, or you could call Mark's Off Road and see what he's got.

 

[Fast Eddy]

Thanks to @PabloCruise for liking my post above, thereby allowing me to correct some bad math. Math matters!

 

[PabloCruise]

Thank you for posting it!
I am trying to get my vacuum lines in order, so I quoted you in my thread…