67 heater control valve - does water flow with or without vacuum? - Vintage Mustang Forums
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post #1 of 4 (permalink) Old 07-06-2017, 11:13 AM Thread Starter
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67 heater control valve - does water flow with or without vacuum?

Factory AC car - I installed from a donor car. nothing every worked. just looked good having a factory system installed!

I'm fooling with the heating system in the car. I just got the blower motor to work with all three speeds.

Looking at the heater control valve -

1. WITHOUT vacuum applied - does water flow to the heater core?


2 WITH vacuum applied - does water flow to the heater core?
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post #2 of 4 (permalink) Old 07-06-2017, 11:19 AM
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IIRC, the system is supposed to fail in the DEF function. That would mean it is normally open.
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Amateur restorer. Well, sometimes I have been paid for it. But not right now.
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post #3 of 4 (permalink) Old 07-06-2017, 12:00 PM
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Agreeing with 22GT, water flows without vacuum.
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'68 coupe 289 C4 (featured in Mustangs & Fords July 2003)
'67 convertible 5.0L EFI conversion (appeared in Mustang Monthly Feb 2017)
'90 LX 5.0L
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post #4 of 4 (permalink) Old 11-14-2017, 10:52 PM
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I figured I would continue on this thread. I am in the process of cleaning my valve up and moving it to a new mounting bracket. The bottom of the valve that sits on the bracket is open...the repops are closed. It looks like the valve body has a recess around the opening. Is there supposed to be a washer/gasket between the valve and the bracket? If so, what was it made of?

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File Type: jpg Heater Control Valve.JPG (91.6 KB, 6 views)

Last edited by Knapper; 11-15-2017 at 10:15 AM. Reason: Pic Added
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