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E320: Charge a/c system , it works -10 minutes and st

Customer Question
Charge a/c system , it...
Charge a/c system , it works for 5-10 minutes and stops
Submitted: 3 years ago.Category: Mercedes
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Answered in 34 minutes by:
5/30/2015
Mercedes Mechanic: Marty, Mercedes Technician replied 3 years ago
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,280
Experience: Bosch Certified Master Tech. Over 35 years experience.
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Hi, if the system is fully charged most likely you have a bad evaporator temperature sensor. I need you to turn the key on and read out the actual values in the system through the climate control panel. Write them down and post them here and I'll tell you the next step. Click on the instructions below.

Read Out Actual Values In Climate Control

Marty
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Customer reply replied 3 years ago

it say the evaporator temperature sensor is = 62

Mercedes Mechanic: Marty, Mercedes Technician replied 3 years ago

That's fine but I need all of the other values. What are you showing for #7, refrigerant pressure?

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Customer reply replied 3 years ago

04

Mercedes Mechanic: Marty, Mercedes Technician replied 3 years ago
That's not enough pressure. You should read about 7 bar with the key on/ engine off. I'd add a little more refrigerant. You are probably about a pound low.
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Customer reply replied 3 years ago

we add 2,2 pounds, is the system is going pop. so put 3.2 pounds

Customer reply replied 3 years ago

u know what, the air get cool, but a/c compressor does not encage

Mercedes Mechanic: Marty, Mercedes Technician replied 3 years ago

Do you have a charging station? I don't want you to overfill it but 4 bar is way to low for your refrigerant pressure. I don't think you really have 2.2 lbs in there.

Also try reading and erasing the fault codes. Click on the instructions below.

Read And Erase Fault Codes in Climate Control

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Mercedes Mechanic: Marty, Mercedes Technician replied 3 years ago
Hi, I'm just following up with you on the Mercedes. Did you get the a/c working? Please let me know.

Marty
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