heh, it took 1 can of 134a, no change. With the AC compressor not coming on, what should the refrigerant pressure be? I'm reading 8 bar
Celsius Mode it is!Since sensor values > 99 loose their most significant digit in the 2-digit display, switching to degC gives values which are much easier to interpret. So I suggest that you repost some values with degC selected.
If your a/c clutch is pulling in for a short while and then dropping out, it's probably because the base unit is detecting a rotational speed error on the compressor. This can be caused by oil on the clutch plates, amongst other things. As far as your system pressure goes, 8 bar looks good at the sort of ambient temperatures you seem to have.
Too bad. There are 2 sensor wires that run around from the back of the compressor to the plug on the front and then 2 wires in the loom back to the base unit in the module box. To check the actual sensor signal requires a 'scope, I think. Otherwise, you could check continuity through the sensor (I guess it's a magnetic sensor with a coil so should have a continuous path through it). You could also check continuity from the plug to the base unit. Trouble is getting to the base unit pins - #40 and #41. In the past, I have opened up the base unit and soldered on flying leads so that I could do checks with the unit plugged in. I did this to check the a/c controller signal to the base unit and the base unit output when my clutch was slipping and I couldn't understand what was going on!Tried the IPA trick, no luck. Im wondering if the speed sensor wire is at fault somehow.
A separate problem, I guess - one for the cold months.I took my Duovalve apart today. OMG, the gaskets had turned to goo. Took 5 spark plugs to cork the darned hoses till i can get a new one.
These purport to be the wiring diags for your a/c:any idea what the order and color codes are for the wires that go to that black connector on the top of the compressor?
Im leaning towards speed sensor issues. All of the wires from the harness to that 3 pin male connector on top of the compressor were comepletely unprotected and groundable to each other, the compressor, etc. No tape, nothing..they were simply twisted together.
I have a feeling either the wiring is fried, the speed sensor took a dose of voltage from the wires being screwy and hencerforth fried, or the climate control unit inside the cabin took a dump, likely from 12V+ being dumped through the wiring into pins #40 and #41.
I hope its something simple lol. I agree with Mike on this, speed sensor related issue. OEM for compressor shows it has a speed sensor on lower side of compressor.
The lack of a rear AC system should not prevent the forward AC from working. My control head, which might have been replaced, showed the same E0 13 error but worked fine after the compressor was replaced. I also tested another control head in the car and got the same error, but the car it came from did not have rear AC.as I see,this is an old subject,but I need some help,my ac was not engaging and the dtc was showing a31m1 problem... I solved it and deleted the code but it was again and again showing the same dtc code and the v2 matrix diode thing.... I decided to change the N22 with another one for testing purpose... (btw my some buttons were not functioning except I hit on them with a hammer) ,so I found one which is in so much better condition then mine,I tested it all the buttons are perfect working,also I heard the clutch engaging for the first time ever but this lasted only for approx 3 seconds then stopped... the dtc now shows E0 13 (rear ac pushbutton connection problem) the fact is the car ı took thıs unit was equipped with rear ac,mine is not... te que : is it a reason for the ac compressor not to engage ?? or is the problrm somewhwre else? if ı solve the hidden problem,will it again be a problem for the comp to engage or not?? thanx...........
Hearing this really made me feel better,today I will get it checked by mb scanner,and will hsare further issuesThe lack of a rear AC system should not prevent the forward AC from working. My control head, which might have been replaced, showed the same E0 13 error but worked fine after the compressor was replaced. I also tested another control head in the car and got the same error, but the car it came from did not have rear AC.
The error should not be a problem.