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Old 08-09-2021, 09:30 AM   #1
mr brick driver
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Default How does the vaccine work on the heater valve. ‘92 745 Turbo

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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Old 08-09-2021, 10:39 AM   #2
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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.
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Old 08-09-2021, 10:40 AM   #3
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Quote:
Originally Posted by Fa182 View Post
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.
Yep this is the one that I've used in the past. Works great.
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Old 08-09-2021, 11:37 AM   #4
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Yes the YG136 is great. That valve is the first part on the stage zero list for any new to me 7/9 Volvo
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Old 08-09-2021, 11:44 AM   #5
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Autocorrected to vaccine instead of vacuum?

I don't 7/9, so this is the only way I'm able to help.
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Old 08-09-2021, 04:47 PM   #6
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The valve is normally wide open.
The valve closes under vacuum, usually only when the system is set to "maximum cooling".

This simply blocks coolant flow through the heater core, and (some say) disrupts the flow through the rear cylinders, possibly making them run too hot.

Common options seem to be:

The stock half-metal style that tends to break off one nipple:




The all-plastic version:





The all-plastic "flying saucer style with no external shaft to leak:





The mentioned YG136 version, that looks half-plastic, but may have an all-metal
version:



The all-matal AC Delco 15-5320:





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

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Old 08-09-2021, 04:57 PM   #7
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Delco 15-5320 was mentioned before as good to use: http://turbobricks.com/forums/showthread.php?t=242812
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Old 08-10-2021, 05:17 AM   #8
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Quote:
Originally Posted by MasterBlaster View Post

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


Almost looks like the one on my Ranger

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Old 08-17-2021, 07:52 AM   #9
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GM 660-1357 bypass style seems a way smarter solution.
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Old 08-17-2021, 08:40 AM   #10
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But where to route the bypass.. No pnp h
Right here
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