Hi Dave, thanks for the response.
I could not work out what the normal levels of donations are!
I removed the Motorized in-car aspirator and tested it, the small fan runs and the termistor's resistance changes when you warm it.
When running the engine with the aspirator removed it seems to operate as normal but perhaps not as good at regulating the temp, as you would expect.
With the engine running (and warm) I tried cooling and heating the aspirator's termistor and the system reacted to that as expected. Also I did not see the failure having waiting 30 mins but perhaps it does not show with the car stationary or perhaps I did not quite leave it long enough.
So I'm thinking that's not the problem.
I re-ran the inbuilt diagnostics, at first you get code 0 (no error) and the fan them starts to speed up (sometimes to full speed during the diagnostic cycles) and after 20-30 seconds I get one error code, then after another 10 seconds another and then sometimes a third. These are all active as they have bleeps.
When I reapeat the diags I get the same sequence except the error codes have some differences;
Code 0 then after 30 sec code 14, then code 43, then code 46. 14, 43 & 46 then cycle.
Code 0 then after 30 sec code 43, then code 45. 43 and 46 then cycle.
Code 0 then after 30 sec code 43, then code 45
Code 0 then after 30 sec code 14, then code 44
I tried the actuactor test sequence (20-27) but that did not change anything.
After a few diag cycles the errors were;
43(Cool Air By-Pass Servo Motor, 11 times)
34(Defrost Vent Feedback Potentiometer, once)
14 (? Twice)
44(Defrost Servo Motor, twice)
45(Defrost Vent Feedback Potentiometer, once)
46(Foot Servo Motor, once)
I keep thinking back to the sound when I get a failure, which is like the center servo motor running but the A/CCM not reading the flap potentiometer correctly and it keeps driving the servo and the gears just click over at their end stop. But if that was the case I assume that I would see a 'Center Vent Feedback Potentiometer' failure code. I am assuming that Jag designed the system so that the flaps would not hit the end stops and then keep clicking!
However your answer seemed to fit well.
If you were working in this car what would you try or do next?
Sunday, March 1st, 2009 AT 9:10 AM