Model: E 320
Refrigerant Type: 134-A
Pressure High: 42 psi
Country of Origin: United States
My wife has a 1998 E 320 and as it warmed up this spring I noticed that the A/C only works when you first start up the car. When it quits blowing cool air you have to shut the motor off and then restart and usually it will blow cool for a while maybe 3 or 4 minutes. The fan works fine in side the cab and the controls all seem to work fine. When it blows cool it seems to be very cool. If you shut off the car remove the key and restart the car the compressor comes on immediately. The twin A/C fans come on as well. At first they come on at high rpm and soon afterward they slow down a bit until the compressor quits and then they shut off as soon as the compressor quits. There is no unusual noise coming from the clutch or anything else. So what do you guys think.
1998 Mercedes e320
When the system quits, press and hold the REST key on the pushbutton unit for >5 seconds, until the display changes to read "1" on the left side and a sensor value on the right. Press the right AUTO key to rotate through the list and write down the values.
Next, turn the engine off and turn the key to position 2 (don't start the engine).
Set the temperatures, left "HI", right "LO".
Within 20 seconds, press REST and EC simultaneously for more than 5 seconds
The LED in the recirculate button flashes and the display shows "di R".
Press AUTO repeatedly until all DTC's are displayed. Record each DTC as it is displayed.
To erase: Only possible after DCT's are red out. Simultaneously press both AUTO > 2 secs. The display will read "d" and "FF" on the two sides.
The information derived from these tests will probably tell what is wrong. It's likely the evaporator temperature sensor, but the above procedure will show for sure.
Those 6's in the trouble codes are really b's.
B1234 is for the sun sensor. You can ignore this one.
B1459 is "Series interface (K2) connection to instrument cluster (A1)". I'm not sure that this is especially relevant, although there may be a problem. The instrument cluster supplies vehicle speed, engine speed and coolant temperature.
For the current-sensor readings, some of the modules report in C and some in F. Since you're even asking about AC, I have to assume that yours reads in C and it is about 22C ambient (reading #1). Reading 3 and 4 are the left and right heater core temperature sensors, and 5 is the evaporator temperature sensor. Reading #5 is clearly wrong. Replace the evaporator temperature sending unit. It is cheap and easy to change.
The sensor does shut the compressor down if the evaporator temperature gets too low, so this does sound like the part. The compressor also shuts down if there is an improbable reading at this sensor, which describes your situation.
Are the two possible parts from two different manufacturers, or for different chassis number series? You might consider calling a local dealer for the part, to ensure that you really get the OEM sensor.
I'm glad to have been able to help.
Enjoy your AC. The automatic climate control in the W210 is pretty good when everything is working right.
Hey guys, I am having similar problem. Where is the antiice sensore located and how do I replace it?
I've never had to change mine, but I believe that it is located on the left side of the evaporator case under the dash. You probably have to remove the bottom and side panels to get to it. Removal or dismantling of the evaporator case is not required.
what did you have to do to your? what was a problem?
My car was suffering from a plugged dryer, which caused a very warm left-side vent and seemingly proper pressures with only 15oz of refrigerant in the system.
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