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Old 06-24-2003, 05:08 PM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
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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Old 06-24-2003, 05:14 PM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
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.
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS

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Old 06-24-2003, 05:18 PM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
Would you say that it is about the same as like a Chevy Blazer or Ford Taurus?
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Old 06-24-2003, 09:13 PM
johnflight1's Avatar
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Join Date: Aug 2002
Location: Las Vegas Nevada
Posts: 252
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
88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg
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Old 06-24-2003, 09:23 PM
300EVIL's Avatar
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Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
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.
Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320

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Old 06-24-2003, 10:43 PM
Posts: n/a
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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Old 06-24-2003, 11:18 PM
Posts: n/a
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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