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  #1  
Old 06-24-2003, 06:08 PM
WANT '71 280SEL's Avatar
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is A/C cold for a 1987 300E?

My dad has a 1987 300E with 160,000 miles on it. He had it converted to r-134a because the r-12 had leaked out. The mechanic put dye into it I think like 3 weeks ago and now the freon has leeked out. While it was working though it didn't seem to be as cold as "normal" american cars. But, I was wondering if the A/C on these cars is even very good anyways. (stock/converted to r-134a). Would it compare to an American car's A/C? I was just curious, that's all.
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David
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  #2  
Old 06-24-2003, 06:14 PM
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With our compressors being built to run on r-12, the results expected when we convert to r134 are highly overestimated. The r134 takes longer to cool the car that the r12. I have r134 in my car, but it cools fine,even on a blazing hot Miami day. I rarely use my AC though.
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  #3  
Old 06-24-2003, 06:18 PM
WANT '71 280SEL's Avatar
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Would you say that it is about the same as like a Chevy Blazer or Ford Taurus?
Thanks
David
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  #4  
Old 06-24-2003, 10:13 PM
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the worst mistake I ever made was converting to r134 on my 88 300e .these systems were not designed to use 134 the condenser is half the size it should be. the 2 gases are designed to be operated at totally diferent pressures! I will be switching back after flushing the system. r134 does not cut it in these cars
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  #5  
Old 06-24-2003, 10:23 PM
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I aggree, When my R12 leaked out I decided to retro my system to 134A. Bad mistake,,,, No where near as cold! Fortunately it still works somewhat though.
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  #6  
Old 06-24-2003, 11:43 PM
Benz300
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Guys,
I'm having the same issue with my 87 260E. Seems like no one seems to carry the R12 anymore. and if it's a known issue that the R134a wont cut it for these systems then why isn't mercedes making it available for the older models that were meant to use the R12 ? What should one do in a situation like this because I've been told that the R12 is too expensive and that's why everyone just stopped keeping it...
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  #7  
Old 06-25-2003, 12:18 AM
LarryBible
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The 124 MB is one of the very worst candidates for conversion. The a/c's in these cars are marginal even with R12. When going to 134 you lose about 20% of the cooling capacity plus they will not cool very much at idle. Unless you're in Alaska, don't do it.

Good luck,
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