SL/R230: New Owner AC Question
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SL600
New Owner AC Question
Hi all, I just purchased my first Benz, 2005 SL600, 57k miles and love it!
However, after only driving it for the second time the A/C went out (light red on control and blinks). The high pressure and low pressure values are the same around 125 psi, and no, the manifold valves weren't open equalizing the pressure, I was using to independent gauges. In my past experience I would say that the AC compressor is shot, however, I noticed the compressor is still spinning and read that some cars come with a variable vain compressor. Is that the case with mine or is it some anomaly? I would think with the low pressure side being so "high" that the SAM would disengage it. I've already ordered a replacement compressor and dryer but it would be awesome to know there may be an alternate solution. I hate knowing the tear down process for replacing it.
Any help is greatly appreciated!
However, after only driving it for the second time the A/C went out (light red on control and blinks). The high pressure and low pressure values are the same around 125 psi, and no, the manifold valves weren't open equalizing the pressure, I was using to independent gauges. In my past experience I would say that the AC compressor is shot, however, I noticed the compressor is still spinning and read that some cars come with a variable vain compressor. Is that the case with mine or is it some anomaly? I would think with the low pressure side being so "high" that the SAM would disengage it. I've already ordered a replacement compressor and dryer but it would be awesome to know there may be an alternate solution. I hate knowing the tear down process for replacing it.
Any help is greatly appreciated!
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Joined: Jan 2006
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
I think playing Parts Roulette is a dubious proposition with any car and is particularly unprofitable with a vehicle as complex as an SL600. Maybe you should look for a competent, well-equipped independent Mercedes tech to work on your car.
This indicates that the refrigerant pressure is too low. But since your gauge measures otherwise, then it would seem likely that either the refrigerant temperature and pressure sensor or the Driver-side SAM to which the sensor is wired is faulty. I would use a $300 Chinese-cloned Star Diagnosis kit to investigate or take the car to the aforementioned tech.
This indicates that the refrigerant pressure is too low. But since your gauge measures otherwise, then it would seem likely that either the refrigerant temperature and pressure sensor or the Driver-side SAM to which the sensor is wired is faulty. I would use a $300 Chinese-cloned Star Diagnosis kit to investigate or take the car to the aforementioned tech.
Thread Starter
Newbie
Joined: Sep 2019
Posts: 4
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SL600
I think playing Parts Roulette is a dubious proposition with any car and is particularly unprofitable with a vehicle as complex as an SL600. Maybe you should look for a competent, well-equipped independent Mercedes tech to work on your car.
This indicates that the refrigerant pressure is too low. But since your gauge measures otherwise, then it would seem likely that either the refrigerant temperature and pressure sensor or the Driver-side SAM to which the sensor is wired is faulty. I would use a $300 Chinese-cloned Star Diagnosis kit to investigate or take the car to the aforementioned tech.
This indicates that the refrigerant pressure is too low. But since your gauge measures otherwise, then it would seem likely that either the refrigerant temperature and pressure sensor or the Driver-side SAM to which the sensor is wired is faulty. I would use a $300 Chinese-cloned Star Diagnosis kit to investigate or take the car to the aforementioned tech.
Thread Starter
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Joined: Sep 2019
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SL600
Thanks bobt, I went back through the WIS and I believe you are spot on. Being that the code is triggered in the AAC it wont engage the swash plate to run the pistons meaning little to no refrigerant compression which is why the suction side is so high. I'm becoming optimistic that it's a sensor or something that has triggered the fault and when the das comes in I can find the real culprit (hopefully not compressor, lol!). I'll update post with what I find out. Thanks again for your help!
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