Original A/C performance - Mercedes-Benz Forum
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post #1 of 72 (permalink) Old 07-08-2019, 03:40 PM Thread Starter
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Original A/C performance

Can anyone tell me whether or not the original air conditioners in the 74 450 SL cars were very good? Did they perform well according to today’s standards?
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post #2 of 72 (permalink) Old 07-09-2019, 09:36 AM
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The AC in these cars are not top performers. When properly charged and with all the vents working, they are adequate, not great. The problem occurs with a conversion from R12 to R134a. R134a will not do well in hot weather.

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post #3 of 72 (permalink) Old 07-09-2019, 10:08 AM
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Envirosafe . . .

Original A/C performance-new-low-1-.jpg
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Brad Cushman
73 450 SL
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post #4 of 72 (permalink) Old 07-09-2019, 11:06 AM Thread Starter
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That’s a problem too. The vents don’t work correctly. Some cool, some warm, some nothing
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post #5 of 72 (permalink) Old 07-09-2019, 11:16 AM
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The vents don’t work correctly.
Your car is easier to correct than later climate control systems - PM me and I can get you started with some very specific reading from the 107 Service Manual for our early cars.

You have good timing - I just went through a vent issue on my car which has the same system as your car.

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post #6 of 72 (permalink) Old 07-09-2019, 11:41 AM
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Originally Posted by cushjbc View Post
Envirosafe . . .

Attachment 2526606
I just bought the Envirosafe kit... sealer, oil, refrigerant but they scared the crap out of me when the instructions said to make sure you don't have any leaks... this stuff is flammable.

Nobody gets out of this life alive.
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post #7 of 72 (permalink) Old 07-09-2019, 12:05 PM
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The High Pressure hose blew on my 1986 560SL, Enviro-Safe, no fire.

The old AC Compressor in my 1983 380SL leaked all the Enviro-Safe, no fire.

I don't think there is much to fret over.

Carl

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"You have chosen to drive a MERCEDES-BENZ, a car in whose construction and production we have taken great pains because we believe that quality is not a matter of chance." -- page 3, Owners Manual 380SL
Timing Chain, Subframe, wiring harness, Climate Control, Rust prevention, etc.
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post #8 of 72 (permalink) Old 07-09-2019, 02:04 PM
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Originally Posted by cwmoser View Post
The High Pressure hose blew on my 1986 560SL, Enviro-Safe, no fire.

The old AC Compressor in my 1983 380SL leaked all the Enviro-Safe, no fire.

I don't think there is much to fret over.
Hmmm... it says right on the can, "DO NOT EXPOSE TO ANY IGNITION SOURCE".

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post #9 of 72 (permalink) Old 07-09-2019, 03:02 PM
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they are adequate, not great.

On a scale of 1 to 10, would you say it is:


The irony is, the heaters in these cars are amazing.
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post #10 of 72 (permalink) Old 07-09-2019, 04:08 PM
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For years, Germans thought that AC in a car was stupid. Hardly any German Mercedes came with AC. They could not understand the high temperatures we can have over here, but they did understand a good heater because of how cold it could get over there.

Many years ago, I visited Germany and stayed with friends. They spoke of the weak Americans always wanting AC in their cars. They said that a sunroof was what mattered, AC was a dumb waste and only added weight to a car. A few years later these same people came to visit me in the central valley of California during a 105-degree summer. They would not even step outside my air-conditioned house to get into a car unless the car was already running with the AC on maximum. During a drive I suggested we turn off the AC and open the sunroof and the look of horror I received was amazing.
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