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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53689
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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E320: Charge a/c system , it works -10 minutes and st

Customer Question

Charge a/c system , it works for 5-10 minutes and stops
Submitted: 1 year ago.
Category: Mercedes
Expert:  Marty replied 1 year ago.
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

Customer: replied 1 year ago.

it say the evaporator temperature sensor is = 62

Expert:  Marty replied 1 year ago.

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

Customer: replied 1 year ago.


Expert:  Marty replied 1 year 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.
Customer: replied 1 year ago.

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

Customer: replied 1 year ago.

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

Expert:  Marty replied 1 year 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

Expert:  Marty replied 1 year ago.
Hi, I'm just following up with you on the Mercedes. Did you get the a/c working? Please let me know.