> No, the Klima was NOT told to turn the a/c on. Pin 10 at the Klima > mount read open on the Ohm meter. I pulled the ACC and it's WAYYYY > different from the
I think that SDL has the refrigerant safety switch in that line. Often it's the last thing on the way to the compressor, but I think in that car it's in the 'signal' rather than the 'power' path. > 123s that I'm familiar with. How do you get these buggers appart and > what are the normal failure modes? I can see several caps on the > bottom circuit board, so I'm guessing that it's similar to the cruise > amp repair? Or should I Pretty similar. It has a processor in it, and a whole buncha components. But the switches are still prone to connection cracking. I don't recall specific details about how to open it, it's got a bunch of clamshell snaps, etc. > "test" this unit before attempting repair? Almost always, in the absence of definitive symptoms. > OK, test results are all normal except for the following: > Sensor Ground test, Pin 8 (coolant temp)=open > Vacuum flaps, pin 8 (short DEF Flap)=1k ohms The coolant sensor may be unplugged, which ought to only prevent the system from heating unless you jump-start it by punching DEF first. I don't think it affects the AC. > Maybe I have a bad (hopefully unplugged) coolant sensor. > What does the vacuum flap reading mean? It means the short DEF flap probably doesn't do what it's supposed to, which means that your defroster duct is never fully closed. So you lose some AC to the windshield. (If it was working.) Broken connection, or burned out solenoid in the vacuum valve. Or, possibly, I've got the reference point for that one wrong. Keep in mind that I made that checklist from poring over the car's schematic, and not all of it has been verified by actually doing it. I was refining that checklist when I got employment again, and basically dropped it. -- Jim _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
