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Author Topic: 73 2.0 with AC vacuum lines  (Read 1489 times)

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Offline dave1987

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73 2.0 with AC vacuum lines
« on: March 18, 2012, 12:32:02 AM »
My 2.0 in my 73 wagon originally had AC. I did away with the compressor but am keeping the vacuum controled climate switch.

On the end of the intake there is a three port vacuum switch. How do all of these ports connect to other devices? Does anyone have a vacuum diagram for a 73 with AC?
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Offline Pintosopher

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Re: 73 2.0 with AC vacuum lines
« Reply #1 on: March 18, 2012, 01:45:22 PM »
Dave,
 My Clymer manual says that the A/C equipped cars used a 3 port vacuum valve. Under normal conditions, it routes the Carburetor vaccum to the distributor advance diaphragm. If the engine overheats while idling (because of the A/C load) , the valve routes Intake manifold vaccum to the Distributor ( using a higher vaccum to advance the timing) and increase idle speed , thereby cooling down the engine. I don't have a diagram to distinguish a 73 from a 72 , but let me know I'll be  trying to scan the 72 diagram.
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Offline dave1987

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Re: 73 2.0 with AC vacuum lines
« Reply #2 on: March 18, 2012, 03:06:48 PM »
That would be the valve I am wondering about. Right now I have the port at the outside end running directly to the manifold vacuum on the #1 runner, and the port inside closest to the carburetor connected to a "T", going to the distributor vacuum advance and to the carburetor "spark port" (distributor port).

I have no idea what the center port is, or if I have the existing two connected properly at all.
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Remembering Jeff Fitcher with every drive in my 78 Sedan.

I am a Pinto Surgeon. Fixing problems and giving Pintos a chance to live again is more than a hobby, it's a passion!

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Re: 73 2.0 with AC vacuum lines
« Reply #3 on: March 18, 2012, 05:25:17 PM »
Dave,
 Give me your Email in a PM , and I'll send you the diagram.. My file size is too large for this forum
Joe
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