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  #1  
Old 07-16-2010, 10:55 AM
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Location: Shreveport, La.
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My A/C isn't cold. Answers?

I spent about 1600 bucks getting a new compressor and lines put on my car. Its been updated to the R134a instead of the old R12. Its got a fan from a W140, which is like 11" compared to my old 8" fan. My A/C should be blowing cold but all it does is suck down my gas and give me nothing in return. I can turn on my fan and it blows at about the same temperature, I can't even notice a real difference.

I'd like to get this fixed before I have to drive back down to Louisiana and suffer through the heat. Any ideas guys?

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  #2  
Old 07-16-2010, 11:20 AM
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It's always difficult to diagnose problems with a modified system. Did the a/c work before you boogered with it? What does the person who charged you $1600 have to say about it? R134a is not as efficient a refrigerant as the original R12. If you are getting no cooling at all, the climate control system may not be turning on the compressor's electric clutch. The '85 300SD has the same system as the 300D, which includes a "Klima" relay to trigger the clutch. Klima has several inputs and all must be satisfied or the clutch does not engage. Search this forum for "Klima" and you can spend the weekend reading.
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Our all-Diesel family
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  #3  
Old 07-16-2010, 11:29 AM
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Quote:
Originally Posted by Jeremy5848 View Post
What does the person who charged you $1600 have to say about it? .

Pinch off your hose from the monovalve to the heater core, if that does it then buy the monovalve repair kit.

If not, Then take it to the guy you just gave the money to and say..."its not cold"


You paid more than alot of people make in a month, you have purchased your answer.
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  #4  
Old 07-16-2010, 12:36 PM
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I would just love to see the bill to know what the heck the mechanic charged you for...
200ish for a new compressor, 200 ish max for new hoses, 50 new expansion valve, I'm guessing a used fan from a 140, maybe 25.00 um 20.00 R134, 1105 labor?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
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  #5  
Old 07-16-2010, 12:53 PM
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Geez that's a lot of money. Yes, take it back. We don't want to say 'rip-off' and hurt your feelings.

IRCC my last one went out and I installed a new compressor and R/D, orings, about $350. AC service place evac'd and tested for leaks, charged with R134, for about $200. Worked great. But that was about 13 years ago.

I read somewhere recently the Germans didn't know how to make air conditioning back then because it's not hot there. Had to laugh. Mine have had AC Delco compressors.
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Past Benzos: 71 250 • 83 240D • 84 190E • 04 C240 • 11 GLK350 • 13 c250 Coupe
http://www.peachparts.com/shopforum/...ine=1276896801
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  #6  
Old 07-16-2010, 01:02 PM
One step at a time
 
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Quote:
Originally Posted by vstech View Post
I would just love to see the bill to know what the heck the mechanic charged you for...
200ish for a new compressor, 200 ish max for new hoses, 50 new expansion valve, I'm guessing a used fan from a 140, maybe 25.00 um 20.00 R134, 1105 labor?

Where can you find a new R4 for $200 ish? Let me in on your secret
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  #7  
Old 07-16-2010, 01:02 PM
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Quote:
Originally Posted by Jeremy5848 View Post
It's always difficult to diagnose problems with a modified system.
Not when the modification includes installing R-134a in an R-12 system!!!
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  #8  
Old 07-16-2010, 01:09 PM
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Quote:
Originally Posted by 4thesporty View Post
Where can you find a new R4 for $200 ish? Let me in on your secret
This forum doesn't allow links to other sources for parts. Do a yahoo or google search for AC compressor, there are several e-tailers. You'll find new for just under $300, rebuilts for a bit less.
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"OC", So-Cal
1979 240D, 122K, 4spd, Colorado Biege w/Tobacco, Pwr Roof, AC, Cruise, Becker Corona - SOLD
Past Benzos: 71 250 • 83 240D • 84 190E • 04 C240 • 11 GLK350 • 13 c250 Coupe
http://www.peachparts.com/shopforum/...ine=1276896801
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  #9  
Old 07-16-2010, 01:16 PM
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Location: San Diego
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No need to demonize R134a for a modified fan

I can get a car, may be a MBZ diesel, with working A/C for $1600. You can spend less than $100 on COLD A/C if you DIY, including pulling a 'used' compressor from a JY and converted it to R134a.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
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1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #10  
Old 07-16-2010, 01:51 PM
92 300D 2.5L OBK #59
 
Join Date: Feb 2007
Location: Central FL
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If you've got a bad Kilma relay do a search on ice cube relay. You can bypass the Kilma with a standard relay you will loose some system protection. At least it works that way on the W124.
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  #11  
Old 07-16-2010, 02:07 PM
LarryBible
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I'm really sorry that someone did this to you. I'm only a few hundred miles from you so I know your climate and what it must be like driving this car.

The sad truth is that for much less money, the system can be put into good factory order with R12 used as the refrigerant and provide adequate a/c performance.

I have seen $1,000 spent before in an effort to make a car cool with 134a, but this is the record at $1,600.

If the system was completely flushed during all this work and Ester oil was used, you would be able to simply recover the 134, remove the adapter fittings and charge with R12. If it has PAG, it will require complete flushing, a new r/d and a charge of mineral or ester oil and R12.

Best of luck with it.
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  #12  
Old 07-16-2010, 02:21 PM
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I agree $1600 USD would buy a car. Also, I don't see how a larger fan is going to hurt unless it's not moving air through the system.
Also, if it's sucking fuel then I'd think the compressor clutch was working... best way to verify is to see it.

Anyway, for any compression driven heat pump to work, you have to have some basic parts working:
A compressor that will compress a gas enough so that it typically liquefies.
A working medium (the gas) - R12, R134a, Ammonia, etc...
Hoses (usually insulated) to convey the working medium.
Two radiators - one to release heat to heatsink and one to absorb from refrigerated space.
Metering valve to develop pressure on high side and slowly release liquid working medium that then evaporates/gassifies.
Heat sink to accept heat. Typically moving air or water.

Methodology:
Compress gas to liquid (liquid wants to let go of heat), run thru radiator (outside) to release heat, meter slowly releases liquid to the low side where it gassifies and wants to absorb heat. Hot gas ready to compress again.

There is a fault when:
the compressor doesn't compress gas to liquid or sufficiently.
there is not enough working medium to compress.
there is too much working medium so that gassification is not possible or efficient.
radiators are not efficient i.e. they do not exchange heat due. Blockage?
the metering valve is clogged or too open to develop pressure.
there is water or unwanted elements in the system.
there is too much or not enough of the proper lubricating oils.
there is a leak in the system.

That's the theory as I understand it...
Your answer is in there somewhere I think.
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  #13  
Old 07-16-2010, 06:47 PM
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please allow readers of this fine website to find sources for parts other than ours on their own. it's not hard to do a search, and this website makes it's only money from the sale of parts. they have excellent pricing and they will usually match lowballs with comparable parts.
suggesting on this fine forum that someone go to a different website for parts is just wrong.
it's just so easy to click the buy parts button up top, and get a list of parts, then call roy or phil and have them get you the best prices possible!
give that a try before looking at other websites at least!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #14  
Old 07-16-2010, 07:13 PM
LarryBible
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I am right there with vs on this. MANY TIMES I've had to explain to people on this forum that offering suppliers other than those that support this site is no different than walking into your local auto supply, going to the counter and telling one of their customers to go down the street to another store.

In ten years I've yet to see anyone officially associated with this site clamp down on such posts. It shows their class. Since I'm NOT officially associated with this site (good news to some posters here) I have been a policeman on this issue many times.

In the beginning of such policing I was straight forward and almost if not completely rude about it. Over the years I have found that many times those who post such alternative sources, just need to have it pointed out to them what they are doing. It never occurred to them how rude it is. I hope it's the case here.
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  #15  
Old 07-16-2010, 07:24 PM
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Join Date: Jun 2010
Location: "OC", so-Cal
Posts: 225
Fastlane lists the compressors for the W123, but when you click on them it comes up "PARTS UNAVAILABLE FOR THIS ITEM" or some such. Perhaps it would help if it said 'contact us for help on this item' if they indeed have them/sell them.

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Chris Brown
"OC", So-Cal
1979 240D, 122K, 4spd, Colorado Biege w/Tobacco, Pwr Roof, AC, Cruise, Becker Corona - SOLD
Past Benzos: 71 250 • 83 240D • 84 190E • 04 C240 • 11 GLK350 • 13 c250 Coupe
http://www.peachparts.com/shopforum/...ine=1276896801
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