AC vacuum lines

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Re: AC vacuum lines

Post by ant7377 on Wed Jan 11, 2017 7:59 am

The water valve is on everything in one formonth or another. Also called heat control valve.
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Re: AC vacuum lines

Post by SonOfTheGrim on Thu Jan 12, 2017 7:08 am

Hawk03, I just noticed that in the link you posted about the water valve, that MCarlo77 your engine bay pics show an ac system just like mine.

http://www.g3gm.com/t10409-heater-control-valve

So then where did you (MCarlo77?) plug the round plug into?
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Re: AC vacuum lines

Post by Mcarlo77 on Thu Jan 12, 2017 12:30 pm

That photo is of my '75 Laguna.  Here's a couple of photos of my '77 Monte w/factory stock A/C.





The 2-wire round plug you're asking about is for the Low Pressure Cutoff Switch located on the high pressure line as shown.  This is the same setup for '76.  But, as stated by 73SS, I don't believe the '74/'75's has a pressure switch and I can't access my '75 right now to confirm.
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Re: AC vacuum lines

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