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  #1  
Old 08-22-2008, 09:41 AM
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Question AC Trouble in 83 300D

Folks, a couple of weeks ago I drove home on a Monday evening, and had cold AC when I shut off the engine. The next morning I fired up the car to go to work, and no AC!
I took it to the shop, who tells me that there is a blockage somewhere in the AC system, and that the compressor is making a bunch of noise. I'm not real sure they know what they're talking about, as they don't work on many old Benzes, but does anyone have any suggestions as to where they should start? Also, if I need to purchase an expansion valve, or new AC compressor, from where would I find these parts at the best price?

Thanks so much in advance for your help!
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  #2  
Old 08-22-2008, 10:09 AM
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Blockage??? In the flow of freon or air blowing across the evaporator?

Is the compressor clutch engaging?
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  #3  
Old 08-22-2008, 11:11 AM
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Quote:
Originally Posted by rfdillon View Post
Also, if I need to purchase an expansion valve, or new AC compressor, from where would I find these parts at the best price?
We are only allowed to recommend getting parts from the site here. {at the buy parts tab above}
It sure ain't the best price, but very good service.

Did they mention what the pressures were doing? Sometimes the monovalve can go out and overpower the AC system with heat. However, if they are saying you have a blockage then hopefully they have determined that with high and low side pressure readings.
Other than the quirky monovalve, these are very straightforward and "normal" AC systems. {not including the Climate Control module of course. [push button thingy]}
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'05 Acura TL 6MT
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Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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Old 08-22-2008, 11:48 AM
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Originally Posted by JimmyL View Post
We are only allowed to recommend getting parts from the site here. {at the buy parts tab above
Except Fastlane does not stock the compressor. So we can tell you that Fastlane lists the compressor, but many other outlets actually have it available.

Also, I will note that this is a GM compressor used in MANY American made cars during the 80's and 90's. Sooooo......if you find some boys with pep or some sort of zone for autos that stock parts for american cars, you could be in luck.

I think Fastlane does stock the expansion valve.
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Current Mercedes
1979 maple yellow 240D 4-speed


Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT
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  #5  
Old 08-22-2008, 03:30 PM
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mmmmmm Diesel...
 
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I bought a NEW Hodyon (Hancock Ind) R-4 through NAPA. Price was $250. It has lasted past it's warranty so far. The rebuilt Murray I installed prior to the new one, lasted one day past it's warranty. The clutch/pulley bearings failed.

The new compressor is not noisy. I can tell it's engaged by the power difference in acceleration.

If you do get a new compressor, replace the expansion valve and drier as well.

I'm not going to tell you which refrigerant to get. I will say to avoid r-134 unless you live in Canada.
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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #6  
Old 08-23-2008, 11:21 PM
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Thanks so much, folks, for your recommendations. I haven't heard back from the mechanic for a couple of days, and I don't have a warm fuzzy that they know what they're doing. By the way, I'm using Freeze 12 as a refrigerant - it works great in R-12 systems. By the way, if I should run into a peppy zone somewhere, what is the precise model of compressor that I should ask for?
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  #7  
Old 08-24-2008, 01:06 AM
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Quote:
Originally Posted by rrgrassi View Post
R-4
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Current Mercedes
1979 maple yellow 240D 4-speed


Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT
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  #8  
Old 08-28-2008, 09:17 AM
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Thanks again, folks for all your helkp. It turned out that the drier was completely plugged up with metal particles - I guess the compressor had been going out although still working. After the AC stopped blowing cold, the compressor made a lot of noise, so I'm replacing it and the drier and the expansion valve. I'll let you know how things go!
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  #9  
Old 08-28-2008, 11:04 AM
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mmmmmm Diesel...
 
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Make sure you flush the entire system to get rid of all the metal particles. Get the NEW R-4 made by Hodyon (Hancock Ind). I am using Freeze-12 also, and it works for me. Freeze-12 does use the ester type oil that R-134 uses, and since Freeze-12 is a blend, it makes sense. Get the BG Frigiquite oil. If you can't find it, get the GM rated ester oil. It's a bit thicker and designed for GM systems. The R-4 is a GM designed compressor.
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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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