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Manifold guage modification?

stephen4785 on Tue July 15, 2008 12:49 PM User is offline

I read on here a while back about adding a second line and valve to a manifold gauge set so that you could switch from vacuum to refrigerant without disconnecting anything. Does anyone have the link to it or know where I could get those fittings and valve?

GM Tech on Tue July 15, 2008 1:20 PM User is offline

Why not just use the "freezeless fittings", or the check valves available as an adapter-- or any good gage set already has the check valves on it.,,,,,

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

mk378 on Tue July 15, 2008 1:31 PM User is offline

You'd just drill out the fitting on the back which is normally a blank to store the other end of the yellow hose. Now you have two ports into the center section of the manifold. Obtain another yellow hose and connect it to the drilled out port. Connect one yellow hose to the vacuum pump and one to the refrigerant cylinder. You need a valve at the vacuum pump to isolate it during charging, because both hoses will fill up with refrigerant when you open the cylinder valve. A self-closing valve on the end of the hose will work.

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