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  #1  
Old 05-12-2000, 06:01 PM
gkimbrough
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It is my understanding that most A/C systems will not engage the compressor if the refrigerant is below a certain level. Being that an 85 300D has a refrigerant capacity of 2.9 lbs., Is there any way the system could run and semi cool with only .40 lbs of freon in the system? I think I just got taken to the cleaners.....He said he added 2.5lbs of R12 to my system at $48.00/lb.

Just looking for comments....
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Old 05-12-2000, 06:19 PM
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Location: New Bedford, MA USA
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How do you know you only have .40 lb of charge? This amount of refrigerant would not be sufficient to close low pressure switch unless there was a restriction in the system which increased the low side pressure. BTW who is selling r-12 for $48.00/lb. That's a really good price..

------------------
Jeff L
1987 300e
1989 300e
1987 BMW 325
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Old 05-12-2000, 06:20 PM
Mike Murrell's Avatar
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It may be too late to save you money on this recent job; I'd like to point out something that will save you money next time around.

BUY AND INSTALL YOUR OWN R12.

You can easily obtain a 609 certification at www.epatest.com or a number of other sites.
You pay about $20, read a 53 page book, answer 21 of 25 questions, and wahlah, you
receive a 609 card and certificate in the mail. I bought R12 recently..paid $18.00 for a can. Sams was and may still be selling 30lb. containers for approx $20 a lb. Professional mechanics buy it for this and maybe less. Knowing this, it makes me SICK when I read about people being charged 50-75 dollars a lb. for R12.

Mike Murrell
Boerne Texas
'91 300-SEL
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Old 05-12-2000, 06:57 PM
gkimbrough
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quote:
Originally posted by jeffsr:
How do you know you only have .40 lb of charge? This amount of refrigerant would not be sufficient to close low pressure switch unless there was a restriction in the system which increased the low side pressure. BTW who is selling r-12 for $48.00/lb. That's a really good price..



I must have not made myself clear. My system was still producing cool air (barely)when I took it in. When I had the system serviced 13 months ago, the compressor would not engage and the system was only 1 lb down. This time, the compressor was engaged and the A/C guy said that he had to pump 2.5 lbs of R12 into the system (meaning there was .40 lb in the system before he pumped it up). I think he stuck it to me since I don't believe the compressor would still be engaging with only .40 lb of R12 in the system before I took it in.
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Old 05-12-2000, 07:29 PM
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Yep, you got hosed. If the compressor was cycling, there is no way you would need that much r-12 to get it up to snuff. BTW how is it working now. If it 's OK, then you really got hosed..

------------------
Jeff L
1987 300e
1989 300e
1987 BMW 325
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  #6  
Old 05-12-2000, 07:52 PM
gkimbrough
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quote:
Originally posted by jeffsr:
Yep, you got hosed. If the compressor was cycling, there is no way you would need that much r-12 to get it up to snuff. BTW how is it working now. If it 's OK, then you really got hosed..



It's cooling a lot better, but it doesn't look like I'll get any satisfaction.... I called him on it but it was his word against mine.

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