There are several sensors or other appendages screwed into what appears to be part of the intake manifold water jacket, right behind the thermostat housing. One of them, which has a plastic top with a couple vacuum line nipples sticking up, has one of those nipples broken off inside the rubber hose elbow that connected it to a vacuum line. The other end of that vacuum line runs over to the driver's side inner fender, where there is an in-line check valve, and then on to I don't know where. The unbroken nipple attaches, I believe, to another device's nipple next to it.

I'm guessing the broken device is a temperature sensitive vacuum line valve. Is this so, and what does it control? How would I specify the new part to order? I have temporarily cleaned the old nipple and glued it back on. Thanks for any help!

Steve