1972 250 C - Air Conditioning Question - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 06-18-2009, 06:31 PM Thread Starter
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1972 250 C - Air Conditioning Question

Hello All. I'd like to get some feedback on a decision I made today regarding repairs being made to a newly acquire '72 250 C. My mother gave the me the car upon with just 26,000 miles on the odometer. She never drove this car and kept it garaged and covered 99% of the time she owned it. It's a slash B. In preparation for driving it from Philly to Atlanta, I've taken it into German Auto Specialists for a state of health, stem to stern, inspection. $3200 dollars later, the last item appears to be a leaking air conditioner compressor. The first recommendation that was made was to "retro fit" the existing AC system with a more modern one. To the tune of $1300 and change. I said that would exceed my budget and asked about replacing the existing air compressor with a new one. That, I was told, would be around $800.00 and would use an alternative coolant that was within current environmental guide lines.

Question #1 - Do you think it was prudent of me to fore go the retro fitted air conditioning system for the immediate savings of $500?

Question #2 - In discussing further the direction I chose, the shop indicated they were not going to replace the existing dryer. In discussing the compressor replacement with friends and the shop I'll be taking it to in Atlanta, the question surrounding not replacing the dryer seems significant. Should I call the shop back and request that the dryer be replaced along with the compressor?

Additional notes: The shop manager told me that the mechanic working on the car said the dryer was in good condition and didn't need replacing. What I'm getting, talking to my friend and the Atl shop, is that once you "open" the system the dryer should always be replaced. Comments?

Thanks in advance!

Oh, and trust me, I'll be posting pictures of this beauty very soon. She's gorgeous.
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post #2 of 5 (permalink) Old 06-19-2009, 09:10 AM
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I am sure your system is very similar to my 73 280C. A new compressor is the way I would (and did) go. You can now get it serviced with some alternatives to R12, which by the way, are compatible with R12. I use Freeze 12. If you go to R134 your cooling capacity will be diminished considerably. I've gone that route on my older Jeep, and am going to change it back to Freeze 12. As far as the dryer goes, REPLACE IT. It won't break the bank, and I am sure it is less than satisfactory because of age if nothing else. I would also take a good look at the hoses too. I replaced all mine, again because of age alone. I've had my 280C for 23 years and just recently did what you had done.....stem to stern look/replace campaign, again just due to age, not failures. Good luck and I am looking forward to your pictures.
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post #3 of 5 (permalink) Old 06-19-2009, 09:44 AM
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Replace the compressor and the drier, and keep using R12 refrigerant (or a compatible alternative). We have the compressor you need for $229.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #4 of 5 (permalink) Old 06-20-2009, 11:09 PM
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I would agree - replace the stuff in one shot. You'd save $$ in labor costs by getting the system upgraded/replaced at one time, instead of doing so over a couple garage visits.
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post #5 of 5 (permalink) Old 06-23-2009, 03:28 AM
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Knowing that you have a 1972 they are telling you that you don't need a receiver drier because of several things. 1. Being that at hand they cannot replace it. 2. Or you leaving Philedelphia.
Yes I am erring on the side of caution.

I would definitely change out the receiver drier and compressor. As far as freeze 12 I would be very hesitant about using it unless you have your own AC servicing equipment. Pulling freon out. Vacuuming. Flushing out and so on.
Why? Most AC shops more than likely turn you away if they anything other than R12 or R134A. They use sniffers to detect. If they don't then contamination occurs within the shop and they can't have it.
If you insist on using freeze 12 then research who handles the freon as far as a shop.

I have a knack for this stuff.
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