1999 e320 ac compressor
 

Hi,
my ec indicator on the ac controler would not disengage, i replaced it. now the ac copmpressor is not functioning. do i need to replcae that too or is there another option. help!! pleaseeee!!!

dragon
1999 E320

I had an issue where my EC button didn't light up, and the compressor was running all of the time. Turned out to be a dirty switch, anfter a few minuted of firmly pushing it over, and over, and over, it flashed then lit up. At idle you should hear the engine stutter as you turn the EC on and off, as the clutch disengages.

Most common cause for EC button always on is compressor is low on freon.

Pull the data and codes from the pushbutton CCU and post here for more help.

Actual values: Engine running, CCU set on auto and 72f, press and hold "REST" for 5 secs. use left auto button to toggle screens and post #1-8, the rest dont matter.

AC error codes: key to pos 2, quickly set the left temp to "HI" and right temp to "LO", press and hold "Rest" and "EC" for 5 secs. Must be completed within 20 seconds. If interrupted, turn ign off then back on and proceed on to next step. "Recirculate" button will light and CCU will go blank, codes can becalled up by pressing the right "AUTO" button.

typical code reads Eb....1234. Toggle through until you receive "FF" for no more codes. Post codes, if any.

Actual values:23 22 23 22 23 23 4 22

Recirculate" button did not light and CCU did not go blank
AC error codes : 1 27, 43 152, 42 72, 41 34, 40 71, 24 11.8, 23 00, 22 00, 21 00, 20 00, 12 4.2, 11 0.3, 10 1.5, 9- 05, 8 25, 7 4, 6 54, 5 26, 4 40, 3 48, 2 24

Run the error codes again. Engine off, key on.

You posted ALL the actual value codes instead (ie 1-40'ish). BTW you can use the left auto button to toggle back down.

EC button is working on new controller.
Eb1 419
Eb1 227
Eb1 231
Eb1 232
EB1 234
Eb1 419
Eb1 423

B1227 - Outside temperature sensor
B1231 - ECT sensor
B1232 - Refrigerant pressure sensor
B1234 - Sun sensor
B1419 - Electromagnetic clutch
B1423 - Switchover block valve

Was the compressor running when you read the current-sensor values (values 1-43, not the trouble codes above)? The pressure is meaningless otherwise.

Clear the codes and see if the compressor starts. If it doesn't, check for new codes. If B1419 returns, check the electromagnetic clutch coil for continuity.

do you have the instructions to clear the codes?

I do, but they're in the climate-control diagnostic manual, which is not with me at the moment.

When you get the chance, i would realy appreciate it.

Since you know how to read the codes, we shall start there.

Read all of the codes (until you get to FF). Then hold both AUTO buttons for >2 seconds before resetting the temperature settings to 72F switching the ignition to OFF.

after clearing codes as per your instructions i checked it again i got
Eb419 again twice 1 time with the fan on the screen. i cleared again Eb419 came up again with no fan...where is the electromagnetic clutch coil?

The electromagnetic clutch coil is located at the front of the compressor, just behind the pulley.

There is a single wire to the coil (the other side is at ground). This has a connector on top of the compressor. Disconnect that and check continuity to ground through the coil.

Checked electromagnetic clutch coil

199 e320 ac compressor
 

http://www.peachparts.com/shopforum/...cons/icon7.gifthanks Guys, went to MB stealer, compressor seized. said it would cost $1200 to replace w/rebuilt $795for the part. Went to www.weberbrosauto.com was able to get compressor for $250 had 60K miles. Highly recommend for used parts.

thanks again
dragon111http://www.peachparts.com/shopforum/...cons/icon7.gif