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  #1  
Old 09-11-2014, 05:01 PM
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300SDL A/C problem

My climate control module went out before and I replaced it. A/C was working intermittently. A/C has been working for a few months and just stopped. Compressor will not kick on no matter which button is pressed. I checked the ovp relay and fuse works. Tach is also working. Pulled kilma and jumped pins 5 and 7. Compressor still will not kick on. What else should I check? Coolant temp sensor was replaced in February.
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1987 300 SDL
2000 E320 Wagon
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  #3  
Old 09-11-2014, 06:01 PM
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Quote:
Originally Posted by leathermang View Post
Check to see if you have refrigerant in the system. That is always first...
if I read the OP post correctly, he jumped terminal 5 and 7 and the compressor should engage. This bypass the low pressure switch.

It could be the ACC is faulty and not putting out 12V. Try jumping 12V directly to compressor. It could be faulty.
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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

2 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #4  
Old 09-11-2014, 07:38 PM
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Which wires do I jump? There are multiple coming out of compressor
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2000 E320 Wagon
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  #5  
Old 09-12-2014, 12:21 AM
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I am not too sure as I never have a need to jump any SDL compressor. Ignore the rpm sensor wiring at the back of the compressor. Whatever left is the coil wiring for the clutch. It may be chassis ground plus 1 terminal. First measure the harnesss to see whether you have 12V with one of the pin to chassis when you jumped terminal 5-7 at the Kilma. If you do then the compressor is bad. If you don't then the problem is upstream. You can put 12v to the compressor terminal and you should hear a click. Be careful if you have the engine running. Good luck.
__________________
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

2 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #6  
Old 09-12-2014, 08:54 AM
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Join Date: Sep 2001
Location: central Texas
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Checking the refrigerant is a clean, standing up, easy check... if no problem with the pressures... then you KNOW the problem is in the electronics somewhere.......
but you could have a faulty connection in something you check...and waste a lot of time...
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  #7  
Old 09-21-2014, 04:01 PM
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It appears that my car has different pinouts for kilma. I traced the wires and here is the pinout. This is the plug for the compressor upside down and the wires facing the firewall.

Left>pin 9 kilma
center>pin 11 kilma
right>pin 7 kilma

Kilma pin 5 is ground
Kilma pins 1 and 2 are +12v ignition switched

Which wire should I jump to +12v?
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