Ac problems code 9006
#26
Member
Well, considering you ha installed the same control valve that was on the old compressor I think making a reset or reprograming with Star Diagnosis it is going to clear this fault unless, you have a short somewhere else.
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William Walker (07-26-2020)
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#30
FYI the wire on mine was blue with green stripe instead of violet with black stripes on a 2008 GL320. If you can get to the A/C connector you should be able to pull the sleeve back a little bit and make sure. Just be careful. The first wire I tried to put my DMM on killed the engine as soon as I put the DMM on it. Make sure you have the right wire before you start cutting into the wires.
Last edited by dagentooboy; 07-29-2019 at 09:00 AM.
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edvaru (08-05-2019)
#31
2009 GL320
I also experienced the AC coming on and off randomly for no apparent reason. My code reader said error 9006 compressor short circuit. I can confirm that 2009 GL320 also has blue/green wire for AC compressor. I installed diode as shown and have no issues so far. Thanks for your detailed pictures.
Find blue/green wire
Install diode
Find blue/green wire
Install diode
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knoppjl (08-10-2021)
#32
Member
So this is an odd issue. It does work but my situation was a bit different. My ac clutch or really just a pulley since these ac compressors never disengage. It’s more like a dampener than a clutch. At any rate there is a bearing in there and mine was making a ton of noise. I decided to just try and replace the clutch/dampner with the compressor on the car. I figured this would be easier than opening up the system for a compressor swap. Well I did manage to change the clutch with the compressor on the truck. This is 2011 gl450. Problems arose though. The ac clutch short error came up and **** down the ac control valve. I have no idea why this happened since the new clutch has no electrical component. So I ordered a new compressor and just for the heck of it some diodes. I installed the diode just as described here on the top of the engine and my ac worked again. I will keep the new compressor because this way I will never have it fail Murphy’s law.
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S-Vibes (07-17-2020)
#33
Super Member
Here's the wire in question on a gas engine (GL 550 in this case). It is by itself inside a ribbed rubber cover that comes up from the compressor behind the power steering reservoir before joining a bunch of other wiring into a common cover on top of the valve cover:
The cover was cut to access the wire
1N4007 diode is inside the black shrink wrap and soldered to the A/C signal wire
The cover was cut to access the wire
1N4007 diode is inside the black shrink wrap and soldered to the A/C signal wire
Last edited by EWT; 09-29-2020 at 08:17 PM. Reason: add info
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lawrencenef (08-09-2020)
#36
Newbie
I’m doing this same repair ,
could you pm more precise instructions on to where and how to connect the diode , I have everything it’s just that I’m way too much of a visual learner and do appreciate the pictures
I have a 2010 GL450 , I found the blue,green wire , I’m totally lost where to disconnect to get the diode solderized and reinstall
I have a 2010 GL450 , I found the blue,green wire , I’m totally lost where to disconnect to get the diode solderized and reinstall
Here's the wire in question on a gas engine (GL 550 in this case). It is by itself inside a ribbed rubber cover that comes up from the compressor behind the power steering reservoir before joining a bunch of other wiring into a common cover on top of the vale cover:
The cover was cut to access the wire
1N4007 diode is inside the black shrink wrap and soldered to the A/C signal wire
The cover was cut to access the wire
1N4007 diode is inside the black shrink wrap and soldered to the A/C signal wire
#37
Member
Diode ordered from eBay 10x for $1.78! Can’t wait to get them and give this solution a try. If this works, this may be my biggest $$aved by searching this forums for solutions.
Thx all for sharing knowledge, especially @Vss
Thx all for sharing knowledge, especially @Vss
I’ll solder it eventually, but just for now I used a quick connector. Don’t ask me about the stupid magnets the previous owner put on the fuel line😖
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crypticresponse (10-12-2021)
#38
Super Member
could you pm more precise instructions on to where and how to connect the diode , I have everything it’s just that I’m way too much of a visual learner and do appreciate the pictures
I have a 2010 GL450 , I found the blue,green wire , I’m totally lost where to disconnect to get the diode solderized and reinstall
I have a 2010 GL450 , I found the blue,green wire , I’m totally lost where to disconnect to get the diode solderized and reinstall
2. Wrap a couple of turns of the cathode end of the diode around the stripped blue green wire and solder
3. Solder a short section of wire to the anode end of the diode, put a ring connector on the other end of the wire and connect to a ground.
4. Use shrink wrap and/or electrical tape to insulate anything that is uninsulated.
#39
Newbie
Same issue
Im reading 5 bars , fans don’t kick in when compressor is on , just did the diode soldering still no cold air , how ever no leaks still has freon
All fuses are ok, the cooling fans kick on when I activate Ac thru sds and have 10 bar pressure on low side and goes up to 16 bars running. This is the second new compressor I have fitted both with the same code. The first new compressor I removed and fitted to another car and is working perfectly on that car. am at a loss as what to do next
#40
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1999 Mercedes Benz ML430 & 2008 R350
Hello friend. Would you please help me, by telling me the colors of the ac wires that I need to install the diode, and where I can find them on my 2008 R350?
#41
Member
There are literally pictures in this thread that do just that. If you’re still confused, then take a pic of your wires and post it here and we’ll help you pick out the right one.
#42
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1999 Mercedes Benz ML430 & 2008 R350
Grateful
Thank you. I checked the thread and don't see the correct color of wires for my 2008 R350. I see other models. If you come across the correct color code for an 08 R350, please respond. I'm a grateful student and you're my mentors.
#43
Member
Respond with the requested picture of the wires in your bundle, and you will have an answer very quickly
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#44
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1999 Mercedes Benz ML430 & 2008 R350
Help please
Would you please send me pics and/or all information on how you were successful and Victorious, installing the diode. Also, PLEASE let me know the color of the correct wires. I'm a grateful student and I appreciate your mentoring me on this great opportunity to do what you did. Freakin awesome!
Your diode install probably saved you $3,000. Please assist a guy in need to help his family stay cool. The humidity activates my passengers Asthma. I'm in The Bronx, NY, and i'ts HOT!🔥🙏🧡👍🇺🇲🇺🇲🇺🇲💪
#45
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1999 Mercedes Benz ML430 & 2008 R350
#47
Member
#48
Here's the wire in question on a gas engine (GL 550 in this case). It is by itself inside a ribbed rubber cover that comes up from the compressor behind the power steering reservoir before joining a bunch of other wiring into a common cover on top of the valve cover:
The cover was cut to access the wire
1N4007 diode is inside the black shrink wrap and soldered to the A/C signal wire
The cover was cut to access the wire
1N4007 diode is inside the black shrink wrap and soldered to the A/C signal wire
I added diode 1N4007 (same as yours) to my 2010 GL550 with original AC compressor. It did not work. Should I try different diode 1N5817 or ....?
#50
hello, friends have the ml w164 bj2009. I have the problem with ERROR CODE 009006 too. air conditioning works sometimes and sometimes not. With me under the bonnet everything looks different. I can't find the cables for the diode to attach 1N4007. engine code om642