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Mastercool gauge manifold question

macs_5 on Thu June 25, 2009 6:26 PM User is offline

Hi, I have a set of mastercool gauges for automotive use that can be used for r12, r134 etc. Question I have is: Why the extra manifold hose hookup on the charging hose position? I do not see using both of these ports at the same time, so what am I overlooking? Oh yea, might add that I know some folks have a four port manifold that they connect vacuum pump and refrigerant at the same time, but you would need another shutoff valve on the extra maniold hookup to isolate either freon or vacuum while performing either operation, correct? Thanks for the education.



TRB on Thu June 25, 2009 9:31 PM User is offlineView users profile

I'm trying to picture the issue your having, what Mastercool gauge set do you have?


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mk378 on Fri June 26, 2009 1:00 PM User is offline

The "hookups" on the back are just blind fittings to store the hoses on when not in use. You don't want to get dust into the ends of the hoses.

macs_5 on Fri June 26, 2009 3:28 PM User is offline

Hi, in order:

I don't really have any issue just want to know how to use the extra fitting and the manifold part number is 89660.

The fitting in my question is integral with the charging/vacuum hose connection, which is basicly a tee, threads into manifold, a normal down orientated port and has an extra schrader valve with cap over it, threaded R12 type threaded nipple.

I would like to hook up vacuum and freon at the same time to avoid breaking connections and to totally evacuate the hoses and manifold prior to charging with R134A.

Thanks for the replies and look forward to information.

Ummm, without giving away my age, remember the OEM Chrysler charging manifold that had like 4-6 ports for working on 60-70's Chrysler products. Remember being able to purge freon from hoses into system and not lose any to atomosphere using the extra ports. Thanks again.



mk378 on Fri June 26, 2009 4:39 PM User is offline

That's sort of a "psuedo 4 valve" setup. You can use two yellow hoses to connect the pump and the refrigerant cylinder at the same time. You'd need to use the isolation valves on the pump and the cylinder to switch between evacuation and charging, but you can leave all the hoses hooked up. When evacuating, the cylinder would have to be closed. The pump will evacuate the hose leading to the cylinder, making it unnecessary to purge air out. When charging, the valve on the pump would have to be closed to keep refrigerant out of it.

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