Diagnosing Mercedes Benz ML350 Air Conditioning (W164)

[@BenzAddiction]

Thanks mate, 2011 ML350 and I have the same issue.

[@johnsworkshop3312]

@@BenzAddiction Thanks for the feedback. Good luck, I hope you get yours resolved.

[@miguelortega7799]

Great vid, I think I have a similar problem, low side pressure is 80, and my high side is 120. Does sound like a compressor control? When I bring up rpm I don't really get a change in pressure. Static pressure sat around 90 psi both sides. Would appreciate any pointers. Thanks

[@johnsworkshop3312]

@@miguelortega7799 yes, that sounds like it could be the solenoid valve.

[@krystian_Hans_Solo]

Hi, it seem's like I have similar problem in my W164, but with some differences. On mine, air conditioning work proper on lowest set of temperature only. When I'm trying to increase the temperature a bit, the evaporator temperature is going down into -2 degrees and then AC is going to turned into a heater. Evaporator temperature is going up to the outside temperature and there is no more cold air flow. I tkinh that my solenoid valve is stucked open and not control the "power" of AC compressor. Do you know if there is a need to suck the gas from the system before I dismantle this solenoid valve? Thank you in advance for help

[@strake338]

Going through this right now. What did you torque the compressor mounting bolts to the engine to? Same for the hose to compressor torque please. Thank you kindly.

[@johnsworkshop3312]

@@strake338 good question. I just tightened by feel. I’d guess 10 to 20 ft-lb

[@strake338]

@@johnsworkshop3312 Thank you Sir. Just wanted to make sure I didn't put it too tight and snap something off.

[@johnsworkshop3312]

@@strake338 I’m with you on that!

[@strake338]

@@johnsworkshop3312 20 NM is the torque for the mounting bolts as well as the hoses to compressor. Page 4 file:///C:/Users/User/Desktop/R&I%20AC%20Compressor.PDF

[@HungNguyen-sb1yu]

I have 2 sets of ac gauges and the high side quick couplers don't fit the high side port of my 2010 ML350. Can you please tell me why and where can I get a coupler that fits? Thank you so much.

[@johnsworkshop3312]

Hmm - that is a tough question. I would have expected that if your gauge sets are for R-134a then the high sides should fit. I'd check at Autozone because I'm sure they will have a gauge set that will fit.

[@HungNguyen-sb1yu]

Where can I find the fuse for the air conditioner? Thank you. I pushed the quick coupler harder and it went in. Now I need to find the fuse to make sure it is ok. Thank you so much.

[@lelemarie9795]

What if I dont have all of that to hook up to tell me what it is? I need help. It's so hot and I dont know what to do

[@johnsworkshop3312]

@@lelemarie9795 I recommend you get a gauge set to see if you are getting pressure from the compressor. If not, that solenoid valve could be the problem.

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