I have collected the sensor information and the errorcodes per your guidelines. Here they are:
#1 30, #2 29, #3 31, #4 31, #5 49, #6 65, #7 01, #8 28.

The error codes are:

E61 227, E61 231, E61 233, E61 234, E61 459, E FF, E

I will appreciate it if you can put me inthe right directions. Thanks in anticipation.

SK

The EC light can be turned off. If you feel that the rfrigerant needs to be recharged, would you let me know the approximate location of the low pressure valve? I have opened the hood andcan see a chrome pipe going from the compressor to the body below the brake fluid cup. This pipe has a valve with a plastic thread cover.

Thanks in anticipation.

SK

Thanks once again for the beer money. I have good news for you. It looks like all you need is a recharge. None of your error codes are significant. The only one that might make a difference to you is B1231, the engine coolant temperature sensor. That sensor informs the climate control unit when it's appropriate to start blowing (hopefully warm) air after staring the car in the winter.

As for the air conditioner, your refrigerant pressures look good. The vent air is warmer than it should be (40s), but still cool enough (60s) to tell that the A/C is working. Often when the refrigerant is low, you'll hear a hissing noise emanating from behind the center vents and notice a temperature difference between the left and right center vents. A simple recharge should put you back in business. In the interim, you can try using the recirculate button to reduce the temperature of the air being drawn through the AC (assuming the interior is cooler than the outside).

Blake

The E55 has been sitting relatively idle. I have replaced the sensors and had the unit charged. EC light is not on. Air temp sensor in front, even after replacing shows error, though I can read outside temp on instrument cluster.

What's the next step – vacuum leak, head unit, ?

Thanks

John F. Burr, Ph.D.
Continuous Term Lecturer
Krannert School of Management
Purdue University
615 Carrolton Blvd
W. Lafayette, IN 47906
765.404.4114

Jesse

In short, your problem is the evaporator temperature sensor (#5). Replace that and you'll be back in business.

Look through my other replies if you are interested in a more comprehensive explanation of why this sensor causes this problem.

Blake

Symptoms are: A tiny bit cold for the first 3-4 minutes, then blows whatever air temp seems to be outside.
First about the faults. I had a bunch of faults that I was able to clear out to a E-FF status with zero showing. A Winter ago I had Firestone replace the Serpentine belt which is where I think the problem might have started. Also checked using my CodeKey ODB reader and no codes thrown.

Here are my error codes, 1st reading is after 3 minutes, 2nd reading after 20 minutes driving to work. These are in Celsius on the left, Fahrenheit on the right in parens:

sensor 1- 37, 36 (98.6, 96.8)
sensor 2- 32, 30 (89.6, 86)
sensor 3- 40, 37 (104, 98.6)
sensor 4- 40, 37 (104, 98.6)
sensor 5- 77, 77 (170.6,170,6)
sensor 6- 37, 95 (98.6, 203)
sensor 7- 08, 08 (bar)
sensor 8- 33, 42 (91.4, 107)

Since sensor 7 reads only 8 bar, so I'm thinking that with no fault codes I might just need a recharge and the problem could be a leak somewhere. A confirmation would help.

Does anyone have a link to the 210 parts numbers for all the sensors?

Thanks in advance,

Jesse
Fairfield, County, Connecticut

Looks like your system is empty and needs to be recharged. The
refrigerant pressure sensor is reporting zero pressure. Sometimes this
is caused by a defective sensor, but that happens rarely. Look
through my previous responses for instructions on how to bypass the
pressure sensor and how to reset the codes if you want to give that a
try before recharging.

If your system is empty, the most common source of leak is the receiver-dryer.

Blake