M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Ac problem. Blows cold, except when idling.

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Old 07-08-2019, 12:21 AM
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Ml350 bluetec
Ac problem. Blows cold, except when idling.

Ac problem. Blows cold, except when idling.

When moving the evap front temp is 35c and pressure range 11-13.5 bar

When stopped in traffic or at a light the air blows warm and the pressure goes steadily up to 28.5 bar.

No codes.

Any feedback or diag advice welcome.
Old 07-08-2019, 03:46 AM
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!st step would be a evac and recharge with fresh refrigerant - any competent shop with the correct machine can do a decent job..
Old 07-08-2019, 07:00 AM
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2002 ML 320 & 2006 ML500




Please UPDATE YOU PROFILE in USER CP to include the year, model 350 gas or diesel and where you live.
Old 07-08-2019, 07:02 AM
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When idling with the A/C on, is the elec. fan on and at what speed, slow or fast?
Old 07-14-2019, 07:00 PM
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Ml350 bluetec
Originally Posted by Maj. Dundee
When idling with the A/C on, is the elec. fan on and at what speed, slow or fast?

You are correct. The fan does not turn on when idling with the a/c on. In fact. The darn thing doesnt turn on at all.

How do I diagnose what failed?
Old 07-14-2019, 08:12 PM
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Poor air conditioning performance at idle, with better performance at higher engine rpms, suggests low refrigerant level. Recharge is called for. Best, but not required, if preceded by an evacuation.
Old 07-15-2019, 11:28 AM
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Originally Posted by Towmater
You are correct. The fan does not turn on when idling with the a/c on. In fact. The darn thing doesnt turn on at all.

How do I diagnose what failed?

You did not update your profile as requested. Please do so. Is your 350 gas or diesel?

Last edited by Maj. Dundee; 07-15-2019 at 11:51 AM.

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