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  #1  
Old 04-22-2009, 05:54 PM
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Location: Powder Springs, GA
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Odd AC problem...please help

Hi guys. I am new to posting but have been a lurker for some time. The question I have is actually for my sister's 1993 190E 2.6. She has been unable to get AC for the past 2 years and in Georgia summers it has been miserable. I took her car to my brother-in-law's shop to get an idea on whether or not it is even charged. It is. It holds vacuum and is full of refrigerant. It just won't blow cold.
Here is the interesting part. When he aimed a large shop fan at the radiator, it almost immediately got cold coming from the vents. The fans, though, did not come on. The compressor ran, cold air came out, but the fans stayed still. Has anyone else here had this happen? What should I look at first? I am confident in being able to fix it if someone will just point me in the right direction.
Ask any question and throw any advice my way.
Thanks in advance.

P.S. I have used the search function but apparently I am not puttting in the right combination of words to get a good hit.

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Old 04-22-2009, 06:12 PM
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Are you saying that all it took to get cold air was to get air flow over the radiator? If that's so, doesn't it blow cold while the car is in motion? Which fan is inop? The viscous fan run by the serpentine belt or the auxiliarly fans in front of the A/C condenser, or both? Any codes set?
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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
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Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

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Old 04-22-2009, 06:22 PM
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Are you talking about the blower motor that circulates air through the cabin?

Thats what it sounds like to me.
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Old 04-22-2009, 06:27 PM
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no cold air while in motion...

The motor fan works fine. The auxillary fans do not. I find it odd that she gets no cold air while driving.
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  #5  
Old 04-22-2009, 10:09 PM
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Pull the 2 wire connector off the blu sesnor at the thermo housing w/key ON...do fans come ON?
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Old 04-22-2009, 10:44 PM
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Sounds like it has been converted to r134 and the condenser is not sized for it. She needs to go back to r12 or install a parallel flow condenser.
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Old 04-23-2009, 11:15 AM
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I will pull the wires tomorrow and check the switch.
Good call. Come to find out it has been switched to R134. Drat.
Parallel flow you say? Something to think about.
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  #8  
Old 04-24-2009, 11:47 PM
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Old AC Problem

Hi Guys
I live in Canada an it dosent get real hot up here but I found on my 190 that if the fan/fans did not run when the compress cut in the AC did not perform properly.
When I got to TS ing the problem I figured out that and should have known from my old Chrysler that if there no or low air flow accross the condenser then the AC system can not cool and if you check any other brand of vehicle you will fine that when the compressor comes on so do the fans, as in the old Chyr the fan never stoped.
Also if you check the referigerent pressures you will find that they go out of sight when the fans are not running but get a fan on and they come down right away.
On my 190 I installed a vicscous drive engine fan and hooked up the ele fan to come on when the coolent temp goes above 105C having the fan come on when the system preeeure is about to blow up the system is no good.
Just remember that if the condenser cant condens because of no air flow the AC cant put out.
Chuck
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  #9  
Old 06-06-2009, 02:52 PM
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I'm resurrecting this old thread with some new questions

I bought a new expansion valve because of the possible incompatibility with the 134 refrigerant. We are going back to the old R12 and I am putting on a new valve and a new compressor.
Would the thermoswitch at the drier cause the auxillary fans to not come on or would it be the AC temp switch on top of the drier? How could I test either of these switches.
We still get cold air from the vents if a big shop fan is directed over the auxillary fans.
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  #10  
Old 06-07-2009, 09:38 AM
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Quote:
Originally Posted by crs2 View Post
I bought a new expansion valve because of the possible incompatibility with the 134 refrigerant. We are going back to the old R12 and I am putting on a new valve and a new compressor.
Would the thermoswitch at the drier cause the auxillary fans to not come on or would it be the AC temp switch on top of the drier? How could I test either of these switches.
We still get cold air from the vents if a big shop fan is directed over the auxillary fans.
This sounds a lot like the question you posed on another thread. Is your question answered? BTW, there are no temp switches on the drier, only pressure switches. One of those switches (probably red in color) works the aux fan(s), the other (black) works the compressor.

__________________
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't
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