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W212 Air Condition Malfunction

E-Class (W212) 2010 - 2016: E 350, E 550

W212 Air Condition Malfunction

Old 07-10-2019, 09:42 PM
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2010 E550
Originally Posted by vincentv999 View Post
Haven't been updating since last time I responded. So We finally hooked it up on this machine "Cool Tech" to flush the system out and recharged it. Seems to fix the problem until yesterday. I started the vehicle and switched the AC to ON and no cold air coming out again! I had to step on the gas pedal to get cold air. After hitting the gas pedal, I would hear the compressor kick on.

Does this mean the AC Compressor is malfunctioning? If it is, it should produce a code when it's hooked up on the Benz scanner right?

So, at what condition is the car engine when the gauges in the picture show the equal pressure on both sides of the compressor? Running or not with A/C on?

If it is running with A/C on it could be your refrigerant charge is low. You would need to have way higher pressure on the high side but if the charge is low the compressor does not come on regardless of the 7 sensors the system monitors. The only sensor reading keeping the compressor from coming on is the low charge.

You said they flushed the system and then it worked until "yesterday". It sounds to me you have a refrigerant leak that allowed it to work until the charge went too low for it to come back on.

Last edited by Arrie; 07-10-2019 at 09:45 PM.
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Old 07-15-2019, 04:28 PM
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Had: '03 C230 Sport Sedan, Have: '14 E350 Sport
I'm not certain exactly what the MB compressor looks like, but Volvo has a known issue where the compressor clutch wears to the point that the coil can't engage the clutch, so the compressor never starts.

Installing small shims resets the distance, so that the coil can again engage the clutch.

Maybe it's something similar to that?
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Old 07-15-2019, 07:08 PM
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2012 E550 Sport
if you'll notice, both of the gauges in the pic are about 65psi, meaning either the car is not running, or the compressor is not compressing...
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