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  #1  
Old 09-03-2002, 01:51 PM
Bob Boyer
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W126: 134r AC refrigerant

If I check with a gauge and find that my system is charged too high, what can be done to rectify it?
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  #2  
Old 09-03-2002, 02:12 PM
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Take some out.
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Steve Brotherton
Continental Imports
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  #3  
Old 09-03-2002, 02:21 PM
Bob Boyer
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Appreciate the humor, steve.

I guess I just release some carefully out and keep mesuring by gauge, right? And I am correct in stating that too much refrigerant can reduce cooling?
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  #4  
Old 09-03-2002, 02:31 PM
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I left my advise at that because I really can't imagine how you would set the refrigerant level with gauges.

Pressures in A/C are the result of a multitude of factors. Too high of pressure running can be a number of things including poor air circulation. Too high of pressures at rest are due to the wrong refrigerant. The pressure of a system with some liquid in it will stay the same (at a given temperature) no matter the amount of liquid. The pressure being given by a temp/pressure chart.
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Steve Brotherton
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33 years MB technician
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  #5  
Old 09-03-2002, 02:34 PM
Bob Boyer
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OK, Steve.

As to wrong refrigerant (assuming it is still an R-12 system), I don't see how. The low pressure fitting (at the top, under blue cap) fits 134r hose fittings exactly. I had thought that R-12 fittings and 134 fittings were different and incompatible. I have no other clue as to retrofitting or not, since no one left a label of any sort.

What do you think? Thanks.
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  #6  
Old 09-03-2002, 04:11 PM
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Aside from using a refrigerant identifier, one can identify the refrigerant by measuring the pressure on a stable system (one on a car that hasn't run in 12 hours) and absolutely measuring the temp (the reason for a stable system). Then comparing the results to temp/pressure charts for possibly used refrigerants.

As an example, R12 at 85deg F would be under 99.8psi. At the same temp R134a would be 103.9psi. This is a way to tell what is in the can. If checking a 30lb cylinder the pressure will be according to these numbers as long as there is liquid in the can. It doesn't matter whether it is 2lbs or 30.
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Continental Imports
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