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  #1  
Old 06-13-2007, 08:39 AM
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1990 300SE No activation of A/C Compressor

Hello all!!
I have a 1990 300SE in the shop because the A/C compressor will not engage. I noticed that this car does not have the traditional klima relay. I think all of the processes go thru the MAS relay in this model. I am trying to find out if I am getting a signal from the A/C push button to activate the compressor but don't know what pin in the MAS relay (if thats how you check) I am suppose to check for activation. Any help would be appreciated!!

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Old 06-13-2007, 09:35 AM
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There was a discussion of this in the last few days. A search should find it.

Here it is:

Long and Covoluted intermittant A/C Problems with '88 300TE
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Old 06-13-2007, 09:49 PM
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Quote:
Originally Posted by brewtoo View Post
There was a discussion of this in the last few days. A search should find it.

Here it is:

Long and Covoluted intermittant A/C Problems with '88 300TE
Thanks for the help BREWTOO but they are talking about a car with a Klima relay which in 1990 I believe that they incorporated it into the MAS Relay on the 300SE. The Mas relay is located where the fuel pump relay and Klima relay was located on earlier versions. It sits right beside the overvoltage protection relay. I can't be sure tho. Maybe they moved the relay to a different location all together. Thanks again for the help!!
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DRIVE HARD-DRIVE FAST-DRIVE TO GET THE HELL OUT OF MY WAY.

1986 190E 2.3-16 Pearl Black!!
1987 190E 2.3-16 Smoke Silver!!
1986 190E 2.5-16 Pearl Black!!
2004 CLK 500 Cabrio Designo package!!
1994 E320 Cabrio Red with black top!!
1985 500 SEL Anthracite Grey !!
2011 Subaru Impreza STI 380HP (Yeah Baby)
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  #4  
Old 06-13-2007, 10:45 PM
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Did you check your pressure switch on the dehydrator? If this is faulty your compressor will not engage.
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  #5  
Old 06-13-2007, 11:26 PM
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Discusses MAS control of A/C and the use of impulse counter in 1990+ models.
http://www.continentalimports.com/ser_index.html doesn't link to article directly. Go to magazine articles..last article on the page.
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  #6  
Old 06-14-2007, 08:51 AM
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Quote:
Originally Posted by wscheffer View Post
Did you check your pressure switch on the dehydrator? If this is faulty your compressor will not engage.
Yes I did and that checked out fine!! Thanks for the help!!
__________________
DRIVE HARD-DRIVE FAST-DRIVE TO GET THE HELL OUT OF MY WAY.

1986 190E 2.3-16 Pearl Black!!
1987 190E 2.3-16 Smoke Silver!!
1986 190E 2.5-16 Pearl Black!!
2004 CLK 500 Cabrio Designo package!!
1994 E320 Cabrio Red with black top!!
1985 500 SEL Anthracite Grey !!
2011 Subaru Impreza STI 380HP (Yeah Baby)
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  #7  
Old 06-14-2007, 09:16 AM
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Quote:
Originally Posted by jbaj007 View Post
Discusses MAS control of A/C and the use of impulse counter in 1990+ models.
http://www.continentalimports.com/ser_index.html doesn't link to article directly. Go to magazine articles..last article on the page.
Thanks for the very useful information. I didn't find what I needed to solve the problem but I did find some of the charts I've been looking for!!
__________________
DRIVE HARD-DRIVE FAST-DRIVE TO GET THE HELL OUT OF MY WAY.

1986 190E 2.3-16 Pearl Black!!
1987 190E 2.3-16 Smoke Silver!!
1986 190E 2.5-16 Pearl Black!!
2004 CLK 500 Cabrio Designo package!!
1994 E320 Cabrio Red with black top!!
1985 500 SEL Anthracite Grey !!
2011 Subaru Impreza STI 380HP (Yeah Baby)
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  #8  
Old 06-14-2007, 02:09 PM
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Are you checking voltage on the wire going to the compressor?
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  #9  
Old 06-14-2007, 05:21 PM
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No activation

Yes. I have no voltage to the activation wire for the compressor clutch.

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DRIVE HARD-DRIVE FAST-DRIVE TO GET THE HELL OUT OF MY WAY.

1986 190E 2.3-16 Pearl Black!!
1987 190E 2.3-16 Smoke Silver!!
1986 190E 2.5-16 Pearl Black!!
2004 CLK 500 Cabrio Designo package!!
1994 E320 Cabrio Red with black top!!
1985 500 SEL Anthracite Grey !!
2011 Subaru Impreza STI 380HP (Yeah Baby)
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