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  #1  
Old 05-17-2004, 06:36 PM
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Location: ny, ny
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a/c - issues

On my 190 e 2.3 1987 benz there are are 3 buttons on the right hand side of the climate control console.
For a while now i have eeen having issues with getting cold air from my a/c. Infact i've had the compressor &, dryer replaced.
My problem is the when i get the sytem charged it usually puts out cold air while its being charged,when i hit the a/c button.
On hot days the a/c button wont work,hot air ends up coming from the vents. Inorder for me to get cold air from the a/c i have to hit the defroster button just above the a/c button.
My question is why does that occur? Is there a faulty connection on the a/c button?
What other things can i do to diagonois the sytem?
Does the defrost button automatically engage the compress, thought that was the purpose of the a/c button.
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  #2  
Old 05-17-2004, 09:32 PM
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OK, IŽll Bite......

Now this is not a diagnosis. But, have you had the vaccum actuators checked to see if they are holding? (these control the where the air directs itself into the cabin and the hot air/outside air mixture)

These are a common failure on the Benz - especially these models from that era. Maybe the A/C is mixing with the outside air too much and therefore it is not all that cold. I had that problem on my benz. Also check the Klima Relay. On mine when extremely hot out, it would have a false connection within (solders) that caused that the A/C would not function to par.

Also, are you sure the system is not leaking or leaked freon therefore you feel it more on hot days - is it fully charged?

Furthermore, I recommend that you do a search and read up on the subject within the forum. Lots of info about the A/C systems and the actuators and the Klima relay and even the push button control that can be part of your problem.

If you not upto speed on all of this - either study and read the posts here or at least take to an indy and pay for an hours time and get a diagnostic. For them to check the actuators is not hard, the central vacuum distribution thing-a-ma-jig is located behind the glove box.

Iggy
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Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)
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  #3  
Old 05-17-2004, 10:25 PM
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a/c issues

Ill check the vacum aucuators,how do i do that?, also is the condensor fan suppose to come on when the a/c is on , come to think of it hasnt come on in a lond time,. do that have anything to do with the wacky operation of my a/c.
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  #4  
Old 05-18-2004, 11:43 AM
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I can not answer your question on the condensor fan. As to verifying the actuators, if you open the glove box and remove the interior shell, behind to the right of the glove box is a central vaccum distribution thing-a-ma-gig. I forget its technical name. You hook a mighty vac to each of the lines (independently) to verify if they still hold vaccum.

Now that I think of it, are you sure that you do not have a vaccum leak somewhere? If there is not enough vaccum pressure I believe that it can cause problems with the actuators. You should most likely start with checking the vaccum lines in the engine compartment for cracks/old age. After that, if everything is good, then go onto the vaccum actuators like I just described. If you are not sure how to do this, then I recomend that you take to a shop. When I first had problems with my system I took it to an indy to verify the problem. He charged me 1 hour labor to check the vacuum pressure of the actuators and then gave the diagnostic of which ones where bad.

Now, this is the clincher. In my car if I recall correctly, there are three actuators behind the dash board and then there is the heater valve located behind the firewall in the engine compartment. To change any one of the actuators behind the dash you have to remove the dash. This is an 8 hour job! It can be done by yourself with patience and good lableing to put everything back together. (do a search under posts by haasman - I believe that he tackled this project and detailed it pretty well with pics.)

But be prepared to spend a long weekend doing so. Now this is only if you have bad actuators. I reiterate, take it to an indy and pay the one hour labor to have the diagnosis of the problem and then from there you can decide whether or not you can tackle the job.

Furthermore, I do not know if your car was retrofited to 134a or not. If it is still in the original a/c configuration it is r12 and this is hard stuff to come by and expensive. Also, the mecanic needs to be certified to work r12.

The reason why I push to get a clear diagnosis is because Benz uses a complex system for the a/c vents that are electric at the push button consol on the dash but oeprate under a vacuum system.

Iggy
__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)
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  #5  
Old 05-19-2004, 01:27 PM
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Join Date: Jan 2000
Location: ny, ny
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I Jumped

I jumped the condensor fan and it operates fine, again the defrost button, when depressed the a/c and compressor will kick in. i will blow cold air. It almost seems like my a/c button doesn't work, but the defrost button works. How do i address this issue. Can i go in and maybe replace that button if its faulty..
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  #6  
Old 05-20-2004, 10:19 AM
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Location: Guatemala, Central America
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If you search the forum you may find a few threads that deal with this. You can purchase a new push button contro unit from fastlane. Though, I think that I may have read that some people have had success with resoldering certain connections within the unit.

iggy
__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)
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