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Old September 10th, 2010, 09:53 AM
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Identify this item???
Tearing down the 350 in my 1971. What is the purpose of the vacuum controlled valve at the rear of the intake. It is inline with one of the heater hoses and shown in the picture below.

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Old September 10th, 2010, 10:54 AM
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Heater water valve! Flow is shut off when A/C is on MAX or system is OFF.
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Old September 10th, 2010, 10:56 AM
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Guess that means a replacement is in my future. Anyone know the part number or if a aftermarket part is available?
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Old September 10th, 2010, 10:39 PM
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Here ya go.

http://www.oreillyauto.com/site/c/de...+control+valve
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Old September 11th, 2010, 06:30 AM
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Rockauto should have them also. Before installing, make sure it opens when vacuum is applied to it and not the other way around like the later years do.

BTW, what did I win?
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Old September 11th, 2010, 02:33 PM
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It keeps the engine from pumping water through the heater core ALL of the time.
Especially nice on cars that have the fan pumping air all the time.

Originally Posted by Lady72nRob71
BTW, what did I win?
2 Garbage cans, and a 1 week supply of garbage!

Jim
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Old September 11th, 2010, 06:17 PM
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Is that the Chevy style that you have there?
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Old September 12th, 2010, 06:28 AM
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Originally Posted by Warhead
2 Garbage cans, and a 1 week supply of garbage!
Thanks - just what I always needed.
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Old September 12th, 2010, 10:37 AM
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Could be a chevy style valve. The pictures of the valve on the O'Reilly and RockAuto site don't look anything like the one I have.

Thanks for all the help guys!
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Old September 12th, 2010, 10:44 AM
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I don't know that you'll find a small diaphram one any more.
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