mr brick driver
Active member
- Joined
- Feb 25, 2004
I have a 1992 745 Turbo. I went to NAPA to find an all metal replacement. The employee helping me asked if vacuum oped or shut the valve. I do not know. Do you know? Thanks.
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Not sure how a vaccine would work on a heater valve, I think there are little to no studies out there yet.
What I am pretty sure about is that the vacuum shuts the valve, so they are open by default.
Motorcraft YG136 is the valve people have used from what I've read.
And of course, the GM 660-1357 bypass style, that "short-circuits" the flow and sends it back, instead of just cutting it off:
http://turbobricks.com/forums/showthread.php?t=246617