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  #1  
Old 05-23-2009, 02:27 AM
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Rebuilding Air Conditioning on 300SD

Last season I took all ac related parts out of the engine bay to save weight and space. to make a short story shorter, i ended up making the car very nice and feel ashamed to be driving around in a $90,000 dollar mercedes with my back sticking to the seat.



The ac compressor will be from an 84 300cd and i need to know if I need to order the stepped seal kit from fastlane. Which ac high pressure switch will i need? There seems to be several options for different pressures and different size threads. Are w123 condensors identical to w126? I have both and dont know which one is which (their both the same and im not sure if i have two w126 ones or two 123 ones). What brand of expansion valve should i buy? What about the drier? I plan to order the seal kit but is there any other little things ill need?


Im going to pnp tomorow to get ac hoses and probably a condensor. If I evacuate the system to 25 inches (im going to use engine vac ) should that be sufficient? refill with 134a and ester oil or craigslist some r12?


Im going to buy these parts from fastlane (******** is being dominated by URO parts and i refuse to put chinese parts on my german car) so I expect atleast a PM telling me which pressure and temps switches to get.



Thanks in advance
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Old 05-23-2009, 11:35 AM
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25" isn't sufficient vacuum to remove any water unless you get the system very hot. That's about 4" Hg pressure, or 100,000 microns. Ideally, you want to get the system below 200 microns.
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Old 05-23-2009, 02:32 PM
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I thought I read somewhere that 25 inches is enough?
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Old 05-23-2009, 03:43 PM
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The table on page 2 might be helpful;

http://www.sanden.com/images/Tech_Sheet.pdf
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Old 05-23-2009, 03:52 PM
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100K microns is little enough air that the system will function, although with increased high-side pressure due to that air. But it won't remove water unless it is very hot. That chart courtesy of Sanden says 130F, and I believe it.
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Old 05-24-2009, 12:32 AM
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Just because it was posted, doesn't mean it was right

Quote:
Originally Posted by turbobenz View Post
I thought I read somewhere that 25 inches is enough?
You read it on this forum. If you find it again, you will find follow up posts by many who know better! Remember, there is no screening for correctness when a post is made. Being generous, maybe it was a typo.
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1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html
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