Vacuum manifold switch

I

Ianrig

New member
I recently purchased a true gem. 1972 Scout II 394. Been in a barn for 14 years. Zero rust. I had the original line ticket and every receipt for anything from the full engine overhaul a couple year before going in storage to every oil change. I trailered it home so I could drain everything and screw anything up by forcing it started on 14 year old gas. I have stripping it down, replacing every hose, belt and fluid etc. My question is on the service manual for it the vacuum diagram shows 2 low temp manifold switch (bronze and blue) on the intake. It also shows a red (high temp) on the water intake. My rig has factory a/c and has a switch on each side of the manifold but does not have the red switch on the water intake. The manual shows another diagram with a high temp red on the intake manifold which connects to the a/c

both of my switches have been painted over and look to be in really bad shape. The barbed end is plugged so I replaced the bronze and the blue. My question is do I need the red(high temp) for the passenger side instead of the bronze for the a/c and the blue on the driver side on the manifold or how should I properly address vacuum needs for the a/c.

Thanks
 
Welcome to the forum and congratulations on your barn baby. I'm thinking the 394 reference must be a typo. Did you mean for a 0 to be where the 9 is? There is an IH sv 392 engine, but those were never installed in the Scout II platform from the factory. Many enthusiasts have since swapped the big bore motor into their scouts, myself included.
I'm wondering if there May be some confusion with regards to your terminology. When I think a/c, I think air conditioning, as in hvac for interior climate control. As far as I can tell, there is no engine vacuum requirement for hvac operation with regards to a '72 Scout. I'm no expert on the climate control system nor the original emissions plumbing, but near as I can make out from perusing the diagrams, those low and high temp vacuum switches are solely for emissions system operation in conjunction with the belt driven a.I.r. Pump, more commonly known as a smog pump. Unless your goal is to have a perfect, by the numbers restoration, or if your Scout is still subject to periodic smog-nazi certification, there is no benefit in power or economy to be realized by retaining all that smog garbage. So before you lose too much sleep over sourcing that high temp switch, you May want to consider if the ends really justify the means.
 
That was a type o. It is the 345. Thanks for the feedback. I already removed the air pump and all it's critters and plugged the holes. I tend to get anal about all the bits and pieces. Knowing there are no vacuum requirements from the a/c, I'll move on to the next one. I was sure the only vacuum requirements were distributor and brakes once I took out the smog stuff, but wanted a second opinion.

Thanks again
 
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