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#31
06-24-2006, 12:12 PM
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my two cents
I've been messin with auto a/c systems since I was about 12 years old and as like everything else Ive learned it all myself!
Every response here is is great and moslty true but each end every situation has its own applications! I didnt knotice if anyone mentioned the sight glass on the filter/dryer? I just gave my SDL a drink of R-12 last week cause I noticed it would warm up slightly at an idle!..ITS BEEN OVER 100 HERE FOR WEEKS.. It took one can and its cooling perfeclty! I HAVE owned a manifold set for at least 20 years now and I usually only montitor the "suction" (LOW SIDE) when filling unless I think there may be a problem to look for. I got certified about 3 years ago and buy R-12 on ebay when I need it! DONT EVEN GET ME STARTED ON THE DUPONT PATENT CONSPIRACY regarding R-12......."google it" sometime just for some interesting reading! cheers possums
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[B]AlanT BELEN NM 93 dodge cummins truck~old reliable 01 Volvo AWD XC70 Turbo Wagon 74 450 SE on the way out! Recent: 1972 Toronado 56k on the clock! IF it plugs in, lights up, makes noise, I'M ON IT! 
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#32
06-24-2006, 02:16 PM
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"I didnt knotice if anyone mentioned the sight glass on the filter/dryer? "
It hasn't been mentioned in this thread but there are lots of posts by me warning that it is only marginally useful. There are conditions in which you will see bubbles in your sightglass EVEN THOUGH YOU ARE FULLY CHARGED.... That is important because your system can work fine with several ounces less than full but even one over will cause problems... this is because the basic theory has to do with the Differential in pressure being used for the phase change from liquid to vapor... thus we advocate the use of scales to measure the refrigerant being induced while monitoring the high and low side pressures... But since I know this stuff is more fully explained at Aircondition.com and past threads on this site ( with pictures )... I keep trying to advocate people looking there first...
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#33
06-25-2006, 05:25 PM
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I am looking at getting an R-12 manifold gauge set... I know that all R-12 connectors are supposed to conform to one SAE standard, so there's no such thing as "metric" with these gauge sets, right? In other words, any R-12 gauge set should be usable on my Merc? Just wanted to confirm before buying...
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84 300SD - bought in April '06 with 237,000 mi
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#34
06-25-2006, 05:53 PM
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As Ed McMahon used to say to Johnny Carson: "You are corRECT, sir!"
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The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later) Last edited by jbaj007; 06-27-2006 at 09:54 PM.
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#35
06-27-2006, 07:24 PM
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Are Yellow Jacket (Ritchie) manifolds considered pretty good? I saw the new ones for R-12/22 with 60" RYB hoses for about $90... Thinking about getting it. Good buy?
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84 300SD - bought in April '06 with 237,000 mi
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#36
06-27-2006, 07:52 PM
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guage
Yes .....That should be fine ...(shop again for price)...but more important see if there is an adapter kit for use with 134a as well..
There may be a set that does it all....$80 bucks http://www.etoolcart.com/index.asp?PageAction=VIEWPROD&ProdID=3176
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#37
06-27-2006, 10:17 PM
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Yea, the one I picked is made for R-12, R-22, and R-134a:
 But even though the EPA approves the use of the same manifold for different refrigerants, I'll probably have to use another set of hoses anyway if I wanted to do R-134a on another car - I don't have the equipment to recover refrigerant from the hoses and can't mix refrigerants...
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84 300SD - bought in April '06 with 237,000 mi
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#38
06-27-2006, 10:41 PM
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Not to threadjack, but my car has been converted to r134a and my compressor has just recently taken a nose dive and I want to convert back to r12. I'm going to be taking the 609 test shortly, along with having my system evacuated and getting gauges. My question is, how do I get r12 adapters for my high and low side connections since they now have the r134a fittings? Thanks.
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Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo
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#39
06-27-2006, 11:55 PM
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Quote:
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#40
06-28-2006, 12:55 AM
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I started to unscrew the low side fittings but I heard refrigerant escaping so I stopped. Is that just the r134 valve coming out of the stock valve?
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Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo
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#41
06-28-2006, 07:29 AM
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It may very well be that.... just as taking the hose end off an R-12 fitting does.... that extra fitting has to actuate the inner old fitting ....without some super long shraeder actuator being attached to the r 134a hose end...
Or they may have removed the Schraeder valve from the old inner fitting.... This may be normal except if you have Service Fittings... where the hose goes into one side and the little square drive is on the other... those are built like the valves inside a manifold guage set...
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#42
06-28-2006, 07:09 PM
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Quote:
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Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo
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#43
06-28-2006, 07:22 PM
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With regular hoses the act of screwing on the end of the hose to the Schraeder valve causes it to open the valve... the same as on a tire stem... and you wait as you get close, crack open the valve at your guages with the refrigerant hooked to the middle...and purge your line of air as you finish screwing the fitting onto the R134a fitting ( in this case ).
So the same kind of situation may apply as you unscrew what was planned on being a permanent addition to the R12 fitting... that it will have the R12 valve opened to the inside by its proximity... and it should seal as you remove it further off the original R12 fitting. The other kind of fitting involves a seperate control for the valve. YOu put the hose onto the other side of the fitting and then have the ability to turn the ( square I think ) rod end on the other side... it has inside a two sided valve like exists inside you guages .. forward and you seal it from one hose, backwards from another passage, inbetween and you have it connected from one hose to another hose.
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#44
06-28-2006, 07:25 PM
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Ok got it thanks. I'm going to get the r134a evacuated tomorrow(payday), my gauges are on the way, and I've got a bid on some refrigerant so I should be in business soon.
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Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo
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