I have recently taken over my mother’s 2002 E320. She is the only owner and the vehicle has 70K miles on it. AS you can imagine the vehicle has tremendous sentimental value. The AC slowly began blowing less cold over two weeks. Now the air is not cold at all.

I took it to JiffyLube to have the system recharged and was told there was a problem and I needed to take it to a mechanic, and he suggested one a few blocks away. After researching this forum and other resources I have determined the following. The heat works fine. The compressor clutch engages and disengages properly. The fuses are fine. Unfortunately, I do not have a pressure meter to investigate further.

I have read and reset the fault code and I get (B1416 Coolant circulation pump (M13)) regularly.

The sensor codes after setting the system to 72 degrees and running for a bit are as follows:

01 78 - In-car temperature sensor
02 85 - Outside temperature sensor (The actual temperature outside was 76)
03 76 - Heater core temp, left
04 75 - Heater core temp, right
05 75 - Evaporator temperature sensor
06 188 - Engine coolant temperature
07 06 - Refrigerant pressure in bar
08 94 - Refrigerant temperature
09 27 - Not used
10 6.0 - Heater blower control voltage (normal 08-6.0, meaning .8 to 6 volts)
11 2.4 - Emissions sensor voltage
12 4.1 - Sun sensor voltage (to shift airflow in car)
20 3.2 - Control current for auxiliary fan
21 42 - Engine speed
22 00 - Road speed
23 211 - Battery voltage at terminal 58d
24 13.1 - Battery voltage
40 164 - Climate control software version
41 91 - Climate control hardware version
42 40 - ?
43 136 - ?

Given the above, I am wondering if I reset the codes will JiffyLube be able to recharge the system, or might there be a larger problem indicated by the sensor codes above?

I am also thinking about performing the recharge myself if that is all that is required.

Any suggestions would be greatly appreciated! Thanks!

Hondo

 

Yes, you do and you used it already.
#7 shows high side pressure in bars.
Your system shows some cooling, but you read the values in cold weather, what is insufficient test.
Do the test in the afternoon when you enter hot car. Before engine start, display pressure #7, then start the engine and observe the pressure change for next couple of minutes.
6 bar on working system is low, but again, we don't know what stage of work your system was on.
Coolant pump has no bearing on AC, but fix it for heating season.